A list of all our privacy-preserving, lightweight browser-based tools. All tools run directly in your browser without uploading any data to our servers.
| Tool Name | Description | Category | Link |
|---|---|---|---|
| ⭐ Add Text to Image | Add text to any image. Your image never leaves your device. | Image & Graphics | Launch |
| ⭐ Meme Generator | Add top & bottom captions, drag to position, and export a PNG — all in your browser. | Image & Graphics | Launch |
| ⭐ QR Code Generator | Turn any text into a QR code instantly. | Image & Graphics | Launch |
| ⭐ Barcode Generator | Create Code-128 or EAN-13 barcodes and export as SVG/PNG. | Image & Graphics | Launch |
| ⭐ Image Resizer & Converter | Resize and convert images between various formats while preserving aspect ratio. | Image & Graphics | Launch |
| ⭐ Batch Image Resizer & Converter | Process multiple images (up to 10) in batch with global resizing and ZIP download. | Image & Graphics | Launch |
| ⭐ Wallpaper Generator | Crop once, then export wallpapers in multiple ratios & resolutions for PC, mobile, and ultrawide — all client-side with ZIP download. | Image & Graphics | Launch |
| ⭐ Crop Image | Crop any image with precision directly in your browser. No upload needed. | Image & Graphics | Launch |
| ⭐ Compress Image Quality | Compress images with adjustable quality and format. Instant preview. Fully offline. | Image & Graphics | Launch |
| ⭐ Online Whiteboard Drawing Board | A simple, client-side canvas for quick sketches, diagrams, and image export. | Image & Graphics | Launch |
| ⭐ Image Placeholder Generator | Generate custom image placeholders with dimensions and text overlay. | Image & Graphics | Launch |
| ⭐ Image Watermark Tool | Add text or logo watermarks with opacity, position, rotation, and tiling. | Image & Graphics | Launch |
| ⭐ Flashcard Generator | Create and import flashcards (CSV), edit as a list, and export a cut-ready PDF with duplex fronts/backs. Private, client-side. | Image & Graphics | Launch |
| ⭐ BPM to Delay Time Calculator | Convert BPM to milliseconds and Hertz for straight, dotted, and triplet note values so delays and reverbs stay on-grid. | Studio Tools | Launch |
| ⭐ Audio File Size Calculator | Estimate WAV/PCM storage from sample rate, bit depth, channels, and duration with live MB/GB and data rate output. | Studio Tools | Launch |
| ⭐ Sample Rate Calculator | Compare two sample rates and bit depths to see Nyquist frequency, theoretical SNR, and bandwidth change before switching. | Studio Tools | Launch |
| ⭐ Video Bitrate & Streaming Calculator | Pick a video bitrate range that fits your upload bandwidth with headroom for stability; includes presets for 720p-4K and an audio allowance reminder. | Studio Tools | Launch |
| ⭐ Footage Storage Calculator | Estimate drive space for ProRes, H.264/H.265, or any custom bitrate across your shoot duration, with per-hour and TB/GB totals. | Studio Tools | Launch |
| ⭐ Aspect Ratio Calculator | Enter any ratio and one side to solve the matching pixel width or height, with presets for 16:9, 2.39:1, 4:3, 1:1, and vertical formats. | Studio Tools | Launch |
| ⭐ Timelapse Calculator | Enter scene duration, target clip length, and FPS to get the required interval, frame count, and slack time for smooth timelapses. | Studio Tools | Launch |
| ⭐ Microphone Sensitivity Calculator | Convert microphone sensitivity between dBV/Pa and mV/Pa with quick interpretation for how much preamp gain you will need. | Studio Tools | Launch |
| ⭐ Depth of Field Calculator | See near/far limits, total depth of field, and hyperfocal distance for your lens, aperture, focus distance, and sensor format. | Studio Tools | Launch |
| ⭐ Field of View Calculator | Compute horizontal, vertical, and diagonal FOV plus frame coverage at distance for any focal length and supported sensor size. | Studio Tools | Launch |
| ⭐ FPS to Hertz Calculator | Convert FPS to Hz, see frame time in milliseconds, and check how well it matches your monitor refresh—fully local. | Studio Tools | Launch |
| ⭐ Mouse Sensitivity Converter | Convert mouse sensitivity between Valorant, CS:GO/CS2, Overwatch 2, and Apex using yaw coefficients to keep cm/360 and eDPI consistent. | Studio Tools | Launch |
| ⭐ Crop Factor Calculator | Convert between Full Frame, APS-C (1.5×/1.6×), and Micro Four Thirds to see 35mm equivalents and the matching focal length on another format. | Studio Tools | Launch |
| ⭐ Shutter Angle Calculator | Convert FPS and shutter angle into exposure time and equivalent shutter speed for cinema motion blur. | Studio Tools | Launch |
| ⭐ ND Filter Calculator | Find the neutral density strength, filter factor, and optical density for your target shutter speed. | Studio Tools | Launch |
| ⭐ Reverb Time Calculator | Calculate BPM-synced reverb decay and pre-delay values for vocals, drums, and sound design. | Studio Tools | Launch |
| ⭐ Hyperfocal Distance Calculator | Find the focus distance that keeps infinity sharp, plus the nearest acceptable focus limit. | Studio Tools | Launch |
| ⭐ Lens Equivalent Calculator | Match focal length and aperture equivalence across full frame, APS-C, Micro Four Thirds, and medium format. | Studio Tools | Launch |
| ⭐ PDF Redaction (Burn-in) | Draw boxes to permanently remove sensitive content. Burn-in redactions—private, in-browser. | PDF & Documents | Launch |
| ⭐ PDF Reorder & Rotate | Drag pages to reorder, rotate 90°/180°, delete unwanted pages, then export. Private, runs in-browser. | PDF & Documents | Launch |
| ⭐ PDF Page Number Adder | Add Bates numbers, page labels, and custom number stamps to selected PDF pages in your browser. | PDF & Documents | Launch |
| ⭐ Crop PDF Pages Online | Drag page bounds, enter exact margins, or detect white space and resize PDF pages locally in your browser. | PDF & Documents | Launch |
| ⭐ PDF Paper Size Converter | Resize PDF pages to A4, US Letter, Legal or custom dimensions with Fit and Fill controls in your browser. | PDF & Documents | Launch |
| ⭐ Markdown to PDF | Convert Markdown to printable PDFs with GitHub-style rendering and syntax highlighting. All client-side, private, in-browser. | PDF & Documents | Launch |
| ⭐ Resume Builder | Create a clean printable CV with experience, education, skills, projects, copy, download, and print controls. Private, in-browser. | PDF & Documents | Launch |
| ⭐ Fill and Annotate PDF Online | Add text, checkmarks, checked boxes, and visible notes to PDF pages privately in your browser. | PDF & Documents | Launch |
| ⭐ PDF to Image splitter | Split a PDF file into individual images and save selected images or all of them in one click. | PDF & Documents | Launch |
| ⭐ PDF Merger | Combine multiple PDF files into one single document. No server upload. | PDF & Documents | Launch |
| ⭐ PDF Compressor | Shrink PDF files instantly in your browser—no uploads required. | PDF & Documents | Launch |
| ⭐ PDF Text Extractor | Extract all selectable text from your PDF files directly in the browser. | PDF & Documents | Launch |
| ⭐ Word Counter | Count words, characters, numbers, and more in your text. | Text Processing | Launch |
| ⭐ Text Case Converter | Convert text to CAPITAL, lowercase, capitalized, sentence case, and alternating case. | Text Processing | Launch |
| ⭐ Alphabetic Numeric Sorter | Alphabetically or numerically sort lines of text. | Text Processing | Launch |
| ⭐ Line Break & Whitespace Cleaner | Remove all or reduce multiple line breaks and excess whitespace from your text. | Text Processing | Launch |
| ⭐ Duplicate Line Remover | Remove identical lines from your text with options for case and whitespace. | Text Processing | Launch |
| ⭐ Text Diff Viewer | Compare two texts and highlight differences. | Text Processing | Launch |
| ⭐ CSV Viewer with Filters & Sort | Upload, view, sort, and filter CSV data instantly in your browser for quick analysis. | Text Processing | Launch |
| ⭐ Readability Score Calculator | Analyze text for its readability level using Flesch-Kincaid and other metrics. | Text Processing | Launch |
| ⭐ Keyword Density Checker | Analyze the frequency of keywords and phrases in your text for SEO. | Text Processing | Launch |
| ⭐ Text Replacement Tool | Find and replace text instantly and privately in your browser. | Text Processing | Launch |
| ⭐ Zalgo Glitch Text Generator | Transform your text into unsettling, glitched Zalgo text. | Text Processing | Launch |
| ⭐ Levenshtein Distance (Edit Distance) | Compare two strings and highlight insertions, deletions, and substitutions. | Text Processing | Launch |
| ⭐ GPA Calculator | Calculate your GPA for high school or college, including cumulative and "what do I need" options. | Financial Calculators | Launch |
| ⭐ SAT↔ACT Converter & GRE↔GMAT Comparator | Convert SAT↔ACT using the official 2018 concordance, and estimate GRE→GMAT (Focus & legacy) via percentile matching. Private, client-side. | Financial Calculators | Launch |
| ⭐ BMI Calculator | Calculate your Body Mass Index (BMI) using imperial or metric units. | Health & Fitness Calculators | Launch |
| ⭐ BMI vs Body Fat % | Compare BMI with estimated body fat % (US Navy & Deurenberg), metric/imperial, plus a mini chart. | Health & Fitness Calculators | Launch |
| ⭐ Body Surface Area Calculator | Estimate BSA from height and weight, compare the Mosteller, Du Bois, and Haycock formulas, and see how much their results differ. | Health & Fitness Calculators | Launch |
| ⭐ Corrected Calcium Calculator | Calculate albumin-corrected total calcium in mg/dL or mmol/L, with clear formula limitations and no input tracking. | Health & Fitness Calculators | Launch |
| ⭐ Heart Rate Zone Calculator | Find target exercise BPM with percentage-of-maximum or heart-rate-reserve zones. | Health & Fitness Calculators | Launch |
| ⭐ Peak Flow Zone Calculator | Find green, yellow, and red peak-flow ranges from a personal best and check an optional current reading. | Health & Fitness Calculators | Launch |
| ⭐ Protein Intake Calculator | Estimate daily protein and a per-meal split from weight, training activity, and goal. | Health & Fitness Calculators | Launch |
| ⭐ QTc Calculator | Compare Bazett, Fridericia, Framingham, and Hodges QTc estimates using heart rate or RR interval. | Health & Fitness Calculators | Launch |
| ⭐ Respiratory Rate Counter | Use a guided timer to count breaths, calculate breaths per minute, and record the measurement context. | Health & Fitness Calculators | Launch |
| ⭐ Waist-to-Hip Ratio Calculator | Calculate WHR from centimetres or inches and compare it with WHO adult screening cutoffs, with standardized measurement guidance. | Health & Fitness Calculators | Launch |
| ⭐ Army Body Fat Calculator | Check the current 2026 U.S. Army body composition standard using waist-to-height ratio, the official 0.550 cutoff, and three-decimal truncation. | Health & Fitness Calculators | Launch |
| ⭐ BMR Calculator | Estimate your Basal Metabolic Rate (BMR) with multiple formulas and quick TDEE multipliers. | Health & Fitness Calculators | Launch |
| ⭐ Calorie (TDEE) Calculator | Estimate your Total Daily Energy Expenditure (TDEE) with activity multipliers and calorie goals. | Health & Fitness Calculators | Launch |
| ⭐ Calories Burned by Activity | Estimate calories burned from METs using your weight and time. Metric/imperial; private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Ideal Weight Calculator | Broca, Devine, Hamwi, and Robinson formulas with metric/imperial inputs and an optional ±10% frame-size adjustment. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Blood Pressure Zone Calculator | ACC/AHA (US) and NICE (UK) classification for clinic, home, or ambulatory readings, with a clear visual zone bar. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Blood Sugar / HbA1c Converter | NGSP % ↔ IFCC mmol/mol with eAG in mg/dL ↔ mmol/L. Clear UI, instant results, 100% client-side. | Health & Fitness Calculators | Launch |
| ⭐ Cholesterol Ratio & Risk Calculator | Calculate Total/HDL, LDL/HDL, Non-HDL cholesterol, and AIP (atherogenic index). Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Child Growth Percentiles (CDC & WHO) | Friendly growth percentiles using WHO (0–5y) and CDC (2–20y) LMS standards. Weight, length/height, BMI, head circumference. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Water Intake Calculator | Estimate daily water needs using weight-based baselines with exercise, climate, altitude, and pregnancy/lactation adjustments. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Heart Beats Counter | Estimate daily, yearly, and lifetime heartbeats, see beats saved by lowering bpm, and compare to animals with very different heart rates. | Health & Fitness Calculators | Launch |
| 🎂 Birthday Countdown | Live countdown to your next birthday with DOB dropdowns, leap-year handling, and shareable URL. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Age Calculator | Calculate age in years, months, and days, and find time until next birthday. | Financial Calculators | Launch |
| ⭐ Age in Weeks & Months Calculator | See age in whole weeks + days, calendar months + days, and decimal months — baby-friendly and private. | Financial Calculators | Launch |
| ⭐ Age Difference Calculator | Exact difference between two birthdays in years, months, and days, plus totals in days/weeks. Private, client-side. | Time & Date Tools | Launch |
| 🎂 Birthday Paradox Calculator | Probability that at least two people share a birthday in a group; leap-day toggle, odds, and quick thresholds. Private, client-side. | Financial Calculators | Launch |
| ⭐ Browser Info Tool | Show IP address, browser type, screen size, and user agent for tech support and debugging. | Web Development | Launch |
| ⭐ HTML Colour Picker | Pick a colour from a palette and get its Hex, RGB, and HSL codes. | Web Development | Launch |
| ⭐ Color Contrast Checker | Check foreground and background colors against WCAG AA and AAA contrast ratios. | Web Development | Launch |
| ⭐ Markdown to HTML Converter | Convert Markdown text to HTML instantly. | Web Development | Launch |
| ⭐ Base64 Encoder / Decoder | Encode and decode text to and from Base64. | Web Development | Launch |
| ⭐ Image to Base64 Converter | Convert any image to a Base64 string in your browser. Copy or download instantly. | Web Development | Launch |
| ⭐ Timestamp Converter | Convert UNIX timestamps to human-readable dates and vice versa. | Web Development | Launch |
| ⭐ LDAP / FILETIME Converter | Convert 18-digit LDAP/Windows FILETIME ↔ Date. Decimal & hex, UTC/local display, AD “Never” handled. | Time & Date Tools | Launch |
| ⭐ Apple Cocoa/Core Foundation Time | Convert CFAbsoluteTime/NSTimeInterval (seconds since 2001-01-01 UTC) to dates and back — fractional seconds preserved. | Time & Date Tools | Launch |
| ⭐ Unix Hex Timestamp Converter | Convert Unix timestamps in hex or decimal (seconds or milliseconds) to dates and back — auto-detect with override. | Time & Date Tools | Launch |
| ⭐ Mac HFS+ Timestamp Converter | Convert HFS+ timestamps (seconds since 1904-01-01 UTC) to dates and back — hex/decimal input, optional byte-swap. | Time & Date Tools | Launch |
| ⭐ SAS Timestamp Converter | Convert SAS datetime (seconds since 1960) or SAS date (days since 1960) ↔ human dates. Hex/decimal, fractional seconds. | Time & Date Tools | Launch |
| ⭐ JSON Formatter & Validator | Pretty-print, minify, and validate JSON data instantly in your browser. | Web Development | Launch |
| ⭐ JSON to YAML Converter | Convert structured JSON into YAML instantly in your browser. | Web Development | Launch |
| ⭐ URL Encoder/Decoder | Encode or decode special characters in URLs. | Web Development | Launch |
| ⭐ Hash Generator (MD5, SHA1, SHA256) | Generate MD5, SHA1, and SHA256 cryptographic hashes of text strings. | Web Development | Launch |
| ⭐ Password Strength Checker | Estimate strength, entropy & crack time with optional PBKDF2 timing — all client-side. | Web Development | Launch |
| ⭐ Blank Markdown Table Generator | Visually create blank Markdown tables by selecting your desired rows and columns. | Web Development | Launch |
| ⭐ Regex Tester | Test and build regular expressions against sample text with live highlighting. | Web Development | Launch |
| ⭐ Favicon Pack Generator | Generate a favicon set with multiple sizes and export assets for websites and apps. | Web Development | Launch |
| ⭐ Time Since/Until Calculator | Calculate the duration (years, months, weeks, days, hours, minutes, seconds) since or until a specific date and time. | Web Development | Launch |
| ⭐ Time Zone Converter | Convert a date & time across 2–3 time zones — DST-safe with 12/24-hour format, overlap suggestions, and a copyable link. | Web Development | Launch |
| ⭐ Printable Monthly Calendar | Generate clean A4/Letter calendars with Monday/Sunday start, ISO week numbers, notes & mini-months. Print or save as PDF — 100% client-side. | Time & Date Tools | Launch |
| ⭐ ISO Week Number Converter | Convert date ↔ ISO week/year and weekday (Mon–Sun), with full week range and 52/53-week validation. Fast, accurate, and 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Day-of-Year ⇄ Date & Weekday Converter | Convert day-of-year (1–365/366) ↔ calendar date and instantly see the weekday. Leap-year aware, UTC-safe, and 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Holiday Countdown | See days, hours, minutes, and seconds until popular fixed-date holidays (Christmas, Halloween, etc.). Includes a custom date countdown. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Add/Subtract Business Days (+ Custom Holidays) | Add or subtract business days with weekend toggles and custom holiday upload. Leap-year aware, UTC-safe, and 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Cron Expression Generator & Parser | Generate or parse cron, view human-readable summaries, and preview next run times. Supports seconds/year and Quartz mode. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Jet Lag Recovery Planner | Estimate timezone adjustment, eastbound vs westbound recovery, and a day-by-day sleep shift plan after travel. | Time & Date Tools | Launch |
| ⭐ Meeting Time Finder | Rank the best meeting slots across 2–6 time zones and flag who falls outside preferred local working hours. | Time & Date Tools | Launch |
| ⭐ Shift Schedule Calculator | Model rotating day, night, and off patterns with break deductions, cycle hours, weekly averages, and next-shift timing. | Time & Date Tools | Launch |
| ⭐ Time Card / Timesheet Calculator | Calculate weekly hours from clock-in and clock-out times, deduct unpaid breaks, and split regular versus overtime totals. | Time & Date Tools | Launch |
| ⭐ Recurring Date Calculator | Generate repeated schedules by days, weeks, months, years, or nth weekday rules for meetings, billing, and reminders. | Time & Date Tools | Launch |
| ⭐ Deadline Planner | Count backward from a target deadline using calendar or business days, review buffers, and custom blackout dates. | Time & Date Tools | Launch |
| ⭐ School / Semester Day Counter | Track term progress, days left in the semester, and remaining class days after weekends and holiday closures. | Time & Date Tools | Launch |
| ⭐ Anniversary / Relationship Calculator | Measure exact time together in years, months, days, total days, and countdown to the next anniversary. | Time & Date Tools | Launch |
| ⭐ Quarter / Fiscal Calendar Calculator | Find the active fiscal quarter, quarter start and end dates, week of quarter, and days remaining from any fiscal year start month. | Time & Date Tools | Launch |
| ⭐ Pregnancy Due Date Calculator | Estimate due date, gestational age, and trimester milestones from LMP, conception date, or IVF transfer details. | Time & Date Tools | Launch |
| ⭐ Protein Isoelectric Point (pI) Calculator | Estimate pI and net charge across pH using selectable pKa sets (EMBOSS, Bjellqvist) or custom overrides. 100% private—runs in your browser. | Science & Engineering | Launch |
| ⭐ Meta Tag Generator | Create SEO, Open Graph, and Twitter meta tags with live preview. Copy or download a ready-to-use head block. | Web Development | Launch |
| ⭐ Open Graph Meta Tag Builder | Build Open Graph and Twitter/X social preview tags with image dimensions, alt text, live preview, copy, and download controls. | Web Development | Launch |
| ⭐ Robots.txt Builder | Build robots.txt with user-agent groups, Allow/Disallow rules, Sitemap URLs, and optional crawl-delay/Host. Copy or download. | Web Development | Launch |
| ⭐ XML Sitemap Generator | Paste a URL list and generate sitemap.xml with optional lastmod, changefreq, and priority fields. Copy or download. | Web Development | Launch |
| ⭐ CSS Gradient Generator | Create linear or radial gradients with multiple color stops, live preview, and one-click CSS copy. | Web Development | Launch |
| ⭐ Scientific Figure & Page Extractor | Extract high-quality images of figures and pages from research PDFs. | Science & Engineering | Launch |
| ⭐ Research Abstract Formatter | Format abstracts with IMRC headings, clean whitespace, and convert to HTML, Plain Text, or LaTeX. | Science & Engineering | Launch |
| ⭐ BioStats Quick Calculator v0.9 | Quickly calculate t-test, chi-square, or ANOVA for your biological data. | Science & Engineering | Launch |
| ⭐ DNA/Protein Sequence Cleaner + Validator | Clean and validate DNA/protein sequences, remove invalid characters, and ensure proper formatting. | Science & Engineering | Launch |
| ⭐ Blot Image Cleaner | Upload blot/gel images for auto-inversion, contrast enhancement, and noise removal. | Science & Engineering | Launch |
| ⭐ PCR Primer Calculator (Tm & GC%) | Compute primer Tm (Wallace, GC%, nearest-neighbor), GC%, GC clamp quality, and quick self-structure checks. Private, client-side. | Science & Engineering | Launch |
| ⭐ Molarity Calculator | Calculate mass, molecular weight, volume, or concentration for chemical solutions. | Science & Engineering | Launch |
| ⭐ Molecular Weight Calculator | Calculate molecular weight from chemical formulas or protein/DNA/RNA sequences. | Science & Engineering | Launch |
| ⭐ Chemical Equation Balancer | Balance reactants and products with whole-number coefficients, grouped formulas, and atom-count checks. | Science & Engineering | Launch |
| ⭐ Empirical Formula Calculator | Find empirical and molecular formulas from element masses or percent composition with ratio steps. | Science & Engineering | Launch |
| ⭐ Percent Composition Calculator | Calculate mass percent, molar mass, and element contributions from a chemical formula. | Science & Engineering | Launch |
| ⭐ Moles ↔ Mass ↔ Volume (Gas at STP) | Convert between moles, grams, and gas volume using STP/IUPAC STP/SATP molar volume; can infer MW from mass + volume. | Science & Engineering | Launch |
| ⭐ Density Calculator | Calculate density, mass, or volume with metric, imperial, liquid, and cubic unit conversion. | Science & Engineering | Launch |
| ⭐ PPM / PPB Concentration Calculator | Convert dilute concentrations across ppm, ppb, mg/L, ug/L, percent, and mass fraction. | Science & Engineering | Launch |
| ⭐ Molality Calculator | Calculate molality in mol/kg of solvent, or solve for solute mass, solvent mass, and moles for solution prep. | Science & Engineering | Launch |
| ⭐ Stoichiometry Calculator | Use a balanced equation to solve mole ratios, limiting reagent, theoretical yield, and percent yield. | Science & Engineering | Launch |
| ⭐ Limiting Reagent Calculator | Identify the limiting reactant, show excess reactant left over, and estimate theoretical yield from a balanced reaction. | Science & Engineering | Launch |
| ⭐ Percent Yield Calculator | Calculate percent yield, actual yield, or theoretical yield with chemistry-friendly unit conversion. | Science & Engineering | Launch |
| ⭐ Equilibrium Constant Calculator | Calculate Kc or Kp from a balanced reaction, compare Q with K, and convert Kc ↔ Kp using temperature and Δn(gas). | Science & Engineering | Launch |
| ⭐ Gibbs Free Energy Calculator | Calculate ΔG from ΔH, ΔS, and temperature, or connect standard free energy with equilibrium constant K. | Science & Engineering | Launch |
| ⭐ Nernst Equation / Cell EMF Calculator | Compute electrochemical cell potential from E° and Q, solve for Q, estimate K from E°, or evaluate concentration cells. | Science & Engineering | Launch |
| ⭐ Lab Dilution Planner — Serial Dilutions | Plan serial dilutions from stock to target with pipette limits, or build a fixed-fold ladder. Private, client-side. | Science & Engineering | Launch |
| ⭐ Centrifuge RPM ↔ RCF Calculator | Convert centrifuge RPM, rotor radius, and relative centrifugal force for lab protocols and equipment changes. | Science & Engineering | Launch |
| ⭐ Enzyme Kinetics Calculator | Plot Michaelis–Menten and classic linearizations; fit Vmax & Km from your data. Private, client-side. | Science & Engineering | Launch |
| ⭐ DNA/RNA Melting Temperature (Tm) Calculator | Compute Tm with Wallace, GC%, and nearest-neighbor methods, including salt and concentration adjustments. | Science & Engineering | Launch |
| ⭐ Protein Concentration Calculator | Bradford & BCA standard curves and direct A280 (Beer–Lambert) with curve fitting, dilution, and path length. Private, client-side. | Science & Engineering | Launch |
| ⭐ Beer–Lambert Law (A = εlc) | Solve absorbance, molar absorptivity (ε), path length (l), or concentration (c). Includes %T ↔ A conversion and unit-aware inputs. 100% client-side. | Science & Engineering | Launch |
| ⭐ Henderson–Hasselbalch — Buffer pH | Compute pH from pKa and [A⁻]/[HA], or design a buffer recipe from target pH, total concentration, and volume. Unit-aware, with optional grams via molar masses. 100% client-side. | Science & Engineering | Launch |
| ⭐ Titration Calculator | Calculate equivalence volume, half-equivalence points, and current pH for common monoprotic acid-base titrations. | Science & Engineering | Launch |
| ⭐ pH / pOH Calculator | Convert between pH, pOH, hydrogen ion concentration, and hydroxide ion concentration with optional pKw adjustment. | Science & Engineering | Launch |
| ⭐ Normality Calculator | Convert between normality and molarity, compute equivalent weight, and size target solution prep from mass or desired normality. | Science & Engineering | Launch |
| ⭐ Dilution Calculator (C1V1=C2V2) v1.1 | Calculate unknown concentrations or volumes using the C1V1=C2V2 formula. | Science & Engineering | Launch |
| ⭐ Sample Size Calculator | Determine the minimum sample size for comparative studies and A/B tests. | Science & Engineering | Launch |
| ⭐ Triangle Calculator | Solve any triangle by entering the three values that you know. | Financial Calculators | Launch |
| ⭐ Trigonometric Triangle Solver | Solve any triangle (AAS, ASA, SAS, SSS, SSA) with Law of Sines/Cosines, degree/radian toggle, precision control, and ambiguous-case handling. Private, client-side. | Financial Calculators | Launch |
| ⭐ Trigonometric Functions Calculator | Calculate sin, cos, tan, reciprocal trig, and inverse trig functions with degree, radian, gradian, and turn units. | Financial Calculators | Launch |
| ⭐ Heron’s Formula Calculator | Triangle area from three sides using Heron’s formula, plus semiperimeter, inradius, circumradius, and altitudes. Private, client-side. | Financial Calculators | Launch |
| ⭐ Pythagorean Triples Generator | Generate Pythagorean triples (a, b, c) with a²+b²=c². Primitive/all multiples, filters, live diagram, CSV export. Private, client-side. | Geometry | Launch |
| ⭐ Circle Calculator | Compute radius, diameter, circumference, and area from any one value. Supports units, decimal places, and π precision. | Financial Calculators | Launch |
| ⭐ Ellipse Area & Perimeter Calculator | Compute ellipse area (πab) and perimeter using Ramanujan I, Ramanujan II, and a high-precision elliptic-integral series. Works from a, b, A, B, area, or eccentricity. Private, client-side. | Financial Calculators | Launch |
| ⭐ Square Calculator | Compute side, diagonal, perimeter, area, inradius, and circumradius from any one value. Units & decimal places. Private, client-side. | Financial Calculators | Launch |
| ⭐ Rectangle Calculator | Compute width, height, diagonal, perimeter, area, and circumradius from any two values. Units & decimals. Private, client-side. | Financial Calculators | Launch |
| ⭐ Parallelogram Calculator | Calculate area, perimeter, two heights, diagonals and angles from adjacent sides plus an angle or perpendicular height. Private, client-side. | Geometry | Launch |
| ⭐ Trapezoid Calculator | Enter bases, legs, or height to get area, perimeter, diagonals & midline. General / isosceles / right. Private, client-side. | Geometry | Launch |
| 🧊 Cube Calculator | Compute edge length, surface area, volume, and space diagonal from any one value. Private, client-side. | Financial Calculators | Launch |
| ⭐ Surface Area Calculator | Calculate total surface area, lateral area, and base area for common 3D shapes with formulas and units. | Geometry | Launch |
| 🛢️ Cylinder Calculator | Compute radius/diameter, height, surface area, lateral area, and volume from any two values. Private, client-side. | Financial Calculators | Launch |
| 🎯 Cone Calculator | Compute radius/diameter, height, slant height, surface area, lateral area, and volume from any two values. Private, client-side. | Financial Calculators | Launch |
| 🌐 Sphere Calculator | Compute radius/diameter, surface area, and volume from any one value. Choose units, decimals, and π precision. Private, client-side. | Financial Calculators | Launch |
| ⭐ Pyramid Calculator | Surface area, volume, height, and slant height for regular pyramids. Private, client-side. | Financial Calculators | Launch |
| ⭐ Regular Polygon Calculator | Area, perimeter, side/apothem, circumradius, and angles for an n-gon. Private, client-side. | Financial Calculators | Launch |
| ⭐ Irregular Polygon Area Calculator | Compute area (shoelace), perimeter, centroid, and orientation from vertex coordinates. Private, client-side. | Financial Calculators | Launch |
| ⭐ Polygon Centroid Calculator | Calculate the area-weighted centroid of a convex or concave simple polygon from ordered x,y coordinates. Private, client-side. | Geometry | Launch |
| ⭐ Polygon Interior/Exterior Angles Calculator | Compute per-vertex interior and signed exterior angles, plus sums and orientation. Regular or custom coordinates. Private, client-side. | Financial Calculators | Launch |
| ⭐ Conic Equation Finder | Compute equations for circles, parabolas, ellipses, and hyperbolas from points, foci, directrix, or parameters. Private, client-side. | Geometry | Launch |
| ⭐ Inverse Function Calculator with Steps | Find inverse rules for linear, power, rational, exponential, and logarithmic functions with domain restrictions and numerical verification. | Algebra & Equations | Launch |
| ⭐ System of Equations Solver | Solve two linear equations exactly with substitution, elimination, graphing, determinant checks, and verification. | Algebra & Equations | Launch |
| ⭐ Linear Equation Solver | Solve ax + b = c with exact fractions, decimals, step-by-step inverse operations, and substitution checks. | Algebra & Equations | Launch |
| ⭐ Absolute Value Equation and Inequality Solver | Solve |ax + b| equations and inequalities exactly with steps, interval or set notation, checks, and a number line. | Algebra & Equations | Launch |
| ⭐ Polynomial Root Calculator | Find every real and complex zero of a degree 1–10 polynomial with multiplicities, method steps, and numerical checks. | Algebra & Equations | Launch |
| ⭐ Equation Expander and Like-Terms Combiner | Expand polynomial expressions or both sides of an equation, then group and combine like powers with exact steps. | Algebra & Equations | Launch |
| ⭐ Polynomial Factoring Calculator | Factor polynomials over the rational numbers with GCF, repeated-factor, synthetic-division, and exact verification steps. | Algebra & Equations | Launch |
| ⭐ Polynomial Long Division Calculator | Divide polynomials exactly with quotient, remainder, worked divide–multiply–subtract steps, and an identity check. | Algebra & Equations | Launch |
| ⭐ Completing the Square Calculator | Rewrite ax² + bx + c = 0 in completed-square and vertex form, then find exact roots with step-by-step algebra. | Algebra & Equations | Launch |
| ⭐ Rational Expression Simplifier | Factor numerator and denominator polynomials, cancel common factors exactly, and preserve every restriction from the original denominator. | Algebra & Equations | Launch |
| ⭐ Partial Fractions Calculator with Steps | Decompose proper or improper rational functions with repeated and quadratic factors, exact coefficients, worked steps, and verification. | Algebra & Equations | Launch |
| ⭐ Radical Expression Simplifier | Extract perfect powers and combine like square, cube, and nth roots with exact coefficients and worked steps. | Algebra & Equations | Launch |
| ⭐ Quadratic Equation Calculator | Solve quadratic equations (ax² + bx + c = 0) and see the step-by-step solution. | Financial Calculators | Launch |
| ⭐ Ratio Calculator | Solve for a missing ratio value and visualize the relationship. | Financial Calculators | Launch |
| ⭐ Fraction Calculator | Add, subtract, multiply, and divide fractions & mixed numbers with step-by-step simplification. | Financial Calculators | Launch |
| ⭐ Comparing Fractions Calculator | Compare fractions, mixed numbers, and whole numbers exactly with cross-products, common denominators, decimals, and steps. | Financial Calculators | Launch |
| ⭐ Proportion Calculator | Solve proportions step by step — find the missing value in “a is to b as c is to ?”. | Financial Calculators | Launch |
| ⭐ Percentage Calculator | Find the percentage of a number, determine percentages, and more. | Financial Calculators | Launch |
| ⭐ Percentage Change Calculator | Quantify the increase or decrease between two values. | Financial Calculators | Launch |
| ⭐ Mean, Median, Mode Calculator | Calculate the mean, median, mode, range, and other key statistics for a set of numbers. | Financial Calculators | Launch |
| ⭐ Average (Mean) Calculator | Quickly compute the arithmetic mean of numbers with support for spaces, commas, and new lines. | Financial Calculators | Launch |
| ⭐ Standard Deviation & Z-Score Calculator | Paste numbers to get mean, variance, standard deviation (population/sample), and per-value z-scores — all client-side. | Financial Calculators | Launch |
| ⭐ Binomial & Poisson Calculator | Enter n,p,k (or λ,k) to compute PMF, CDF, expected value, variance, and view a probability bar chart — all client-side. | Financial Calculators | Launch |
| ⭐ Exponent / Power Calculator (xy) | Calculate powers like 25 or 10-3 in a kid-friendly xy layout. Supports negatives, zero exponents, and scientific notation. | Financial Calculators | Launch |
| ⭐ Prime Factorization Calculator | Check if a number is prime and get its full prime factorization with exponents — instant, private, and student-friendly. | Number Theory | Launch |
| ⭐ Scientific Notation Converter | Convert standard ↔ scientific (a × 10n) & engineering notation. Handles E-notation and significant figures — 100% client-side. | Financial Calculators | Launch |
| ⭐ Logarithm Calculator | Compute ln, log10, log2, and log base b; includes change-of-base and antilog — 100% client-side. | Financial Calculators | Launch |
| ⭐ Permutation & Combination Calculator | Compute permutations (nPr) and combinations (nCr) — with or without repetition, exact BigInt results plus approximation. | Financial Calculators | Launch |
| ⭐ LCM & GCF Calculator | Find least common multiple (LCM) and greatest common factor (GCF/HCF) of any integers — supports negatives, zero, and BigInt for large values. | Number Theory | Launch |
| ⭐ Common Factor Calculator | Find all common factors and the greatest common factor for two or more integers, with optional Euclidean steps. | Number Theory | Launch |
| ⭐ APR ↔ APY Converter & CAGR | Convert APR⇄APY with custom, daily (360/365), and continuous compounding, plus calculate CAGR instantly. | Financial Calculators | Launch |
| ⭐ Effective Interest Rate Calculator | Convert nominal APR to effective annual rate, reverse to equivalent APR, compare compounding frequencies, and project balances. Private, client-side. | Financial Calculators | Launch |
| ⭐ NPV & IRR Calculator | Compute NPV & IRR from a cash-flow table; switch between equal periods or exact dates (XNPV/XIRR), with CSV import/export — 100% client-side. | Financial Calculators | Launch |
| ⭐ Perpetuity Calculator | Compute present value (PV) for level, due, or growing perpetuities — or solve for cash flow (C), discount rate (r), or growth (g). 100% client-side. | Financial Calculators | Launch |
| ⭐ Mortgage Repayment Calculator | Estimate loan payments, total interest, and view a full amortization schedule. | Financial Calculators | Launch |
| ⭐ Mortgage vs Renting Calculator | Compare buying vs renting over time—monthly costs, equity, and cumulative net cost with a simple chart. | Financial Calculators | Launch |
| ⭐ Loan Calculator | Calculate monthly payments and view a full repayment schedule. | Financial Calculators | Launch |
| ⭐ Business Loan Calculator | Estimate fixed-rate business loan payments, fee-inclusive APR, total cost, payoff timing, and a full amortization schedule. | Financial Calculators | Launch |
| ⭐ Car Lease vs Buy Calculator | Compare leasing and buying over the same horizon, including payments, fees, mileage, resale equity, and remaining loan balance. | Financial Calculators | Launch |
| ⭐ Credit Utilization Calculator | Calculate overall and card-by-card utilization, available credit, and the paydown needed for a target ratio. | Financial Calculators | Launch |
| ⭐ Inventory Break-Even Calculator | Find break-even units and revenue from fixed costs, selling price, and variable cost per unit, with target-profit analysis. | Financial Calculators | Launch |
| ⭐ Mortgage Closing Costs Calculator | Itemize mortgage loan costs, prepaids, escrow, deposits, financed costs, and credits to estimate cash to close. | Financial Calculators | Launch |
| ⭐ Mortgage Points Calculator | Compare quoted mortgage rates with and without points, estimate break-even, and see cost at a planned payoff, sale, or refinance date. | Financial Calculators | Launch |
| ⭐ Net Worth Calculator | Itemize assets and liabilities, calculate net worth, and compare it with an earlier financial snapshot. | Financial Calculators | Launch |
| ⭐ Portfolio Expense Ratio Calculator | Find a value-weighted portfolio expense ratio and model how recurring fund costs affect an investment over time. | Financial Calculators | Launch |
| ⭐ Profit Margin Calculator | Calculate and compare gross, operating, and net profit margins with visible income-statement formulas. | Financial Calculators | Launch |
| ⭐ Rental Property Calculator | Estimate first-year rental cash flow, NOI, cap rate, cash-on-cash return, mortgage payment, and DSCR. | Financial Calculators | Launch |
| ⭐ Savings Withdrawal Calculator | Estimate how many monthly withdrawals savings can fund, or solve for monthly income over a chosen number of years. | Financial Calculators | Launch |
| ⭐ Student Loan Repayment Calculator | Estimate fixed monthly payments, total interest, payoff date, daily interest, and extra-payment savings. | Financial Calculators | Launch |
| ⭐ Loan Comparison | Compare two loans side by side, add extra payments, and see early payoff savings. | Financial Calculators | Launch |
| ⭐ Auto Loan Calculator | Estimate car payments with down payment, trade-in, taxes, fees, APR, and term. Includes amortization schedule. | Financial Calculators | Launch |
| ⭐ Depreciation Calculator | Build annual depreciation schedules with straight-line, declining balance, double declining balance, sum-of-years-digits, and MACRS half-year table estimates. | Financial Calculators | Launch |
| ⭐ Boat Loan Calculator | Estimate boat payments with down payment, trade-in, taxes, marine fees, APR, term, payoff date, and amortization schedule. Private, client-side. | Financial Calculators | Launch |
| ⭐ Debt Snowball & Avalanche Calculator | Prioritize debts via Snowball or Avalanche, apply extra budget, and see payoff dates, total interest, and a month-by-month schedule. Private, client-side. | Financial Calculators | Launch |
| ⭐ Debt Avalanche Calculator | Prioritize highest APR balances to minimize interest. Enter debts, add extra budget, and view your payoff schedule. Private, client-side. | Financial Calculators | Launch |
| ⭐ Minimum Credit Card Payment Calculator | Estimate minimum payment, payoff time, and total interest. Supports “% of balance” or “greater of %/fixed”. Private, client-side. | Financial Calculators | Launch |
| ⭐ Balance Transfer Calculator | Compare a promotional balance transfer with keeping the current card, including fees, post-promo APR, payoff time, break-even, and estimated net savings. | Financial Calculators | Launch |
| ⭐ Debt Consolidation Calculator | See if a consolidation loan could lower your monthly payment or total interest. Compare APR, term, and fees vs. current debts. Private, client-side. | Financial Calculators | Launch |
| ⭐ Debt-to-Income (DTI) Ratio Calculator | Calculate housing (front-end) and total (back-end) DTI with monthly or annual income. Includes friendly thresholds and guidance. Private, client-side. | Financial Calculators | Launch |
| ⭐ Loan Affordability Calculator | Estimate maximum affordable payment, loan amount, and (in mortgage mode) home price from income, debts, and DTI caps. Private, client-side. | Financial Calculators | Launch |
| ⭐ Refinance Break-Even Calculator | Compare old vs new payment, costs & points, and see months to break even plus interest over your hold period. Private, client-side. | Financial Calculators | Launch |
| ⭐ HELOC Calculator | Estimate home equity line of credit capacity, CLTV, available credit, draw-period payment, repayment payment, and interest. Private, client-side. | Financial Calculators | Launch |
| ⭐ Credit Card Payoff Time Calculator | Project months to payoff from a fixed payment, estimate total interest, and export an amortization table. Private, client-side. | Financial Calculators | Launch |
| ⭐ New vs Old Car Cost Calculator | Compare total cost of ownership: purchase/financing, fuel or electricity, maintenance, insurance, fees, and resale. Shows NPV, EAC, and cost per mile. | Financial Calculators | Launch |
| ⭐ Car Insurance Cost Estimator | Estimate an illustrative annual premium with a clear factor breakdown. Currency & tax settings, CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| ⭐ Life Insurance Calculator | Educational level-term premium estimator using survival probabilities & present-value math. Shows net & illustrative gross premiums, death-in-term probability, and CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| ⭐ Health & Fitness Calculators Insurance Cost Estimator | Educational tool that estimates your total annual cost: premiums + out-of-pocket under deductible, copays, coinsurance, and OOP maximum. Clear line-by-line breakdown, flow-through visualization, scenario presets, and CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| ⭐ Dental Insurance Cost Estimator | Educational tool that estimates your annual dental cost: premiums + your share after deductible and class coinsurance, with plan-side caps (annual max) and orthodontic lifetime max. Shows Preventive/Basic/Major/Ortho breakdown, waiting-period toggles, clear table outputs, and CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| ⭐ Travel Insurance Cost Estimator | Educational single-trip premium estimator with transparent factors: duration, destination region, age, medical limit, excess, sports/activities, baggage, and cancellation. Shows clear breakdown, risk multiplier, presets, and CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| ⭐ Business Insurance Calculator | Transparent, educational estimator for GL, Property, Workers’ Comp, and Professional/Cyber. Exposure × base rate with clear factor breakdown (limits, deductibles, territory, experience), minimum premium/fees, taxes, and CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| 🏠 House Insurance Cost Estimator | Transparent, educational estimator for Buildings & Contents with clear multipliers (rebuild cost, contents, construction, roof age, security, flood/wind/crime, occupancy, claims), optional endorsements, excess/deductible effects, taxes, and CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| 🏢 Apartment / Flat Insurance Estimator | Estimate an illustrative annual premium with a transparent factor breakdown (contents, floor level, sprinklers, security, location, excess). Currency & tax settings, CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| 🧳 Renters Insurance Cost Estimator | Educational HO-4/tenant tool estimating an illustrative annual premium with a transparent factor breakdown (contents limit, building type, floor level, security & crime, deductible, liability, endorsements/discounts). Currency & tax settings, CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| 🐾 Pet Insurance Cost Estimator | Estimate an illustrative monthly & annual premium with a transparent factor breakdown (species, breed risk, age, weight, vet-cost index, limit, reimbursement, deductible). CSV export. Private, client-side (not a quote). | Financial Calculators | Launch |
| ⭐ Bitcoin Unit Converter | Instantly convert BTC ↔ satoshi ↔ mBTC ↔ μBTC. Privacy-first, client-side math. | Financial Calculators | Launch |
| ⭐ Mining Profitability Calculator | Estimate revenue, electricity cost, profit, and ROI from hashrate, power, price/kWh, difficulty, and block reward. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Transaction Fee Calculator | Tx size (bytes) × sat/vB → fee in sats, BTC, and fiat using your BTC price. No APIs; fully client-side. | Financial Calculators | Launch |
| ⭐ Crypto Portfolio Diversification Calculator | Enter holdings and prices to see allocations, concentration, and an equal-weight rebalance suggestion. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Staking Rewards Calculator | Estimate staking rewards and final balance from amount, APY %, and time. Fixed-rate assumption, 100% client-side. | Financial Calculators | Launch |
| ⭐ Crypto Profit/Loss Calculator | Compute absolute P/L, ROI %, breakeven sell price, and fee breakdown from buy/sell price, quantity, and fees. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Loan Collateral Calculator | Loan amount + target LTV + liquidation threshold → required collateral value, overcollateralization, and buffer to liquidation. Optional price to show units and liquidation price. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto DCA Calculator | Plan dollar-cost averaging with recurring amount, frequency, fees, and prices. Shows total invested, total units, average cost basis, and unrealized P/L. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Retirement Calculator | Monthly DCA, projected growth rate, and a target balance → estimated months and years to goal. Private, client-side. | Financial Calculators | Launch |
| ⭐ HODL Time Value Calculator | Initial amount, time held, and final value → ROI, annualized CAGR, and comparison to a benchmark return. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Impermanent Loss Calculator | Price change in a 50/50 AMM pair → impermanent loss %, LP value, and HODL comparison. Educational, client-side. | Financial Calculators | Launch |
| ⭐ Amortization Calculator | Calculate fixed loan payments, total interest, and generate an amortization schedule. Supports multiple currencies and flexible terms (days, months, years). | Financial Calculators | Launch |
| ⭐ Payback Time Calculator | Measure how long it takes to recover an investment with simple and discounted payback. Supports annual/monthly periods, constant or custom cash flows, CSV export, and a cumulative chart. | Financial Calculators | Launch |
| ⭐ VAT & Sales Tax Calculator | Add or remove VAT (UK/EU) or sales tax (US). Choose standard, reduced, or zero rates—or override with your own value. Fully client-side for privacy. | Financial Calculators | Launch |
| ⭐ Annuity PV/FV & Break-Even | Compute PV/FV for ordinary/due and growing annuities, plus break-even units & revenue, margin, and markup — with annual→per-period rate conversion. 100% client-side. | Financial Calculators | Launch |
| ⭐ Discrete Compounding Calculator | PV/FV for lump sums & ordinary/due annuities, solve for rate or periods, plus APR↔EAR and periodic-rate helpers — 100% client-side. | Financial Calculators | Launch |
| ⭐ Simple Interest Calculator | Calculate simple interest and the total amount instantly. | Financial Calculators | Launch |
| ⭐ Simple vs Compound Interest | Compare simple vs compound interest side-by-side — totals, EAR, and a clean growth chart. | Financial Calculators | Launch |
| ⭐ ROI Calculator | Calculate Return on Investment (ROI) and annualized returns. | Financial Calculators | Launch |
| ⭐ ROI by Project / Business Line Calculator | Multi-project ROI with per-row fees, dates or duration, CAGR, and portfolio weighted ROI. 100% client-side. | Financial Calculators | Launch |
| ⭐ Rule of 72 Calculator | Estimate doubling time or required annual rate with the Rule of 72 and see the exact compounding comparison. Private, client-side. | Financial Calculators | Launch |
| ⭐ Tip Calculator | Quickly calculate tips, split bills, include/exclude tax, and apply rounding. | Financial Calculators | Launch |
| ⭐ Restaurant Bill Splitter & Tip Calculator | Enter meals, prices, and quantities to split a restaurant check evenly. Add a tip by percent or fixed amount—mobile-friendly and private. | Financial Calculators | Launch |
| ⭐ Shipping Cost Calculator — FOB vs CFR | Compute CIF, duty, VAT, insurance (110% uplift), destination fees, FX conversion, and per-unit landed cost—simple, client-side. | Financial Calculators | Launch |
| ⭐ SIP Calculator | Estimate total invested, wealth gained, and maturity value for systematic investments. | Financial Calculators | Launch |
| ⭐ CD Calculator | Calculate maturity value and interest earned from fixed-term deposits with APY/APR and compounding. | Financial Calculators | Launch |
| ⭐ Discount Rates Calculator | Compare single vs. stacked discounts, compute the equivalent rate, and reverse-calc a target price — with optional sales tax. | Financial Calculators | Launch |
| ⭐ Commission Calculator | Calculate flat, tiered, quota, split, bonus, draw, and gross sales commission pay. Private, client-side. | Financial Calculators | Launch |
| ⭐ Markup & Margin Calculator | Convert markup ↔ margin, price from cost, profit per unit, and compare scenarios — optional tax display. | Financial Calculators | Launch |
| ⭐ ARR Calculator | Compute Accounting Rate of Return from average profit using initial or average investment, with simple or detailed mode (depreciation & tax). | Financial Calculators | Launch |
| ⭐ One Rep Max Calculator | Estimate your one-repetition max using Epley, Brzycki, and Lombardi formulas. | Health & Fitness Calculators | Launch |
| ⭐ Race Split Planner | Plan even or negative splits for 5K/10K/Half/Marathon with per-km/mi targets and CSV export. | Health & Fitness Calculators | Launch |
| ⭐ Pace / Speed / Time | Enter any two (pace, speed, time, or distance) and compute the third — km/mi aware with instant conversions and CSV export. | Health & Fitness Calculators | Launch |
| ⭐ AOE Calculator | Convert between your local time and AOE (UTC−12). Shows offset difference & day shift. DST-safe and fully client-side. | Time & Date Tools | Launch |
| ⭐ Date Calculator | Find days between dates (incl. business days) or add/subtract days, weeks, months, or years. | Financial Calculators | Launch |
| ⭐ Workdays Calculator | Count workdays between two dates or add/subtract business days — optional holidays supported. | Time & Date Tools | Launch |
| ⭐ All-in-One Unit Converter | Convert length, mass, temperature, area, volume, speed, time, and digital storage — fully client-side for privacy. | Financial Calculators | Launch |
| ⭐ Acres to Square Feet Calculator | Convert acres to square feet, square yards, square meters, hectares, and square miles with copy and CSV export. | Financial Calculators | Launch |
| ⭐ Unit Price Calculator | Compare package prices by cost per ounce, gram, pound, kilogram, fluid ounce, liter, or item. | Financial Calculators | Launch |
| ⭐ Binary/Hex/Octal Converter | Convert between binary, octal, decimal, and hex — supports negatives, BigInt, prefixes, and 4-bit grouping. 100% client-side for privacy. | Financial Calculators | Launch |
| ⭐ HTML Minifier & Beautifier | Minify HTML for smaller size or beautify for readability — all processed locally in your browser for privacy. | Web Development | Launch |
| ⭐ JavaScript Minifier & Beautifier | Minify JavaScript for faster load times or beautify for readability — fully client-side for privacy. | Web Development | Launch |
| ⭐ YAML to JSON Converter | Convert YAML to JSON instantly in your browser — 100% client-side for privacy and speed. | Web Development | Launch |
| ⭐ JWT Encoder | Build and sign JWTs (none, HS256, RS256) with easy time-claim helpers. Private, client-side. | Web Development | Launch |
| ⭐ JWT Decoder | Decode JWTs, view header/payload, check exp/nbf/iat, and verify HS256/RS256 signatures. Private, client-side. | Web Development | Launch |
| ⭐ Lorem Ipsum Generator | Generate Lorem Ipsum filler text by words, sentences, or paragraphs. Copy as plain, HTML, or Markdown — all client-side. | Web Development | Launch |
| ⭐ Slug Generator | Create clean URL slugs from titles or text. Lowercase, remove accents, trim length, and batch process lines — all client-side. | Web Development | Launch |
| ⭐ Stopwatch | Accurate stopwatch with laps, keyboard shortcuts, and CSV export — 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Sleep Calculator | Find the best bedtimes or wake-up times using 90-minute sleep cycles and a fall-asleep buffer — all client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Countdown Timer | Set hours, minutes, and seconds, then run a smooth countdown with live milliseconds. Presets, Start/Pause/Reset, optional chime — all client-side. | Time & Date Tools | Launch |
| ⭐ Pomodoro Timer | Run calm focus/break cycles with session stats, streaks, chime, and desktop notifications. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Beam Load Calculator | Compute support reactions, shear force, and bending moment diagrams for simply supported beams with point loads and UDLs. | Science & Engineering | Launch |
| ⭐ Engineering Tolerances Calculator | Hole & shaft limits, min/max clearance or interference, and fit classification from deviations or IT grades (H/h/js). Private, client-side. | Science & Engineering | Launch |
| ⭐ Fluid Flow Calculator | Calculate Reynolds number, velocity, and pipe diameter. Classify flow regime as laminar, transitional, or turbulent. | Science & Engineering | Launch |
| ⭐ Buoyancy Calculator | Buoyant force and floating depth (draft) from ρ, V, g. Optional Awp and mass/weight for equilibrium draft. Private, client-side. | Science & Engineering | Launch |
| ⭐ RC Time Constant Calculator | Compute τ = R·C and plot charging & discharging curves from an initial voltage. Unit-aware inputs. Private, client-side. | Science & Engineering | Launch |
| ⭐ Work, Power & Energy Calculator | Compute work from force, displacement & angle, average power from time, and efficiency from input energy/power. Private, client-side. | Science & Engineering | Launch |
| ⭐ Specific Heat Calculator | Solve q = mcΔT for heat energy, mass, specific heat capacity, or temperature change. | Science & Engineering | Launch |
| ⭐ Momentum & Impulse Calculator | Solve p = mv, J = FΔt, and change in momentum with clear one-dimensional sign conventions, unit conversion, and copy/download tools. Private, client-side. | Science & Engineering | Launch |
| ⭐ Gravity & Newton’s Second Law | Calculate surface/altitude gravity (g), Earth-g, and weight; solve F = m·a. Presets for Solar System bodies or custom mass/radius. 100% client-side. | Science & Engineering | Launch |
| ⭐ Free Fall & Gravity Calculator | Compute time to hit ground, impact velocity, and kinetic energy from height. Presets for Earth, Moon, Mars, Jupiter; optional initial velocity & mass. 100% client-side. | Science & Engineering | Launch |
| ⭐ Acceleration Unit Converter | Convert m/s², g, ft/s², in/s², Gal/mGal/µGal, km/h/s, mph/s, and knot/s with adjustable precision, fixed/scientific notation, and one-click copy & share — all client-side. | Science & Engineering | Launch |
| ⭐ Projectile Motion Calculator | Compute range, time of flight, maximum height, apex distance & impact speed — presets for Earth/Moon/Mars, custom g, initial height, and speed in m/s, km/h, or mph. 100% client-side. | Science & Engineering | Launch |
| ⭐ Centripetal Force Calculator | Compute centripetal force, radial acceleration, and g-forces from mass, speed, and radius. Private, client-side. | Science & Engineering | Launch |
| ⭐ Coulomb's Law Calculator | Compute electrostatic force, attraction or repulsion, electric field, and potential energy from two charges and distance. | Science & Engineering | Launch |
| ⭐ Pendulum Calculator | Compute period and frequency from length, gravity, and amplitude with small-angle or exact large-angle modes. | Science & Engineering | Launch |
| ⭐ Kinetic & Potential Energy Calculator | Compute KE (½mv²), PE (mgh), total mechanical energy, and use conservation to find speed at a height or max height. Private, client-side. | Science & Engineering | Launch |
| ⭐ Spring Oscillator Calculator | Hooke’s Law force, SHM period/frequency (T, f, ω), and max potential energy from k, m, and x. Private, client-side. | Science & Engineering | Launch |
| ⭐ Resonance & Natural Frequency Calculator | Mass–spring–damper & RLC (series/parallel) resonance: ωₙ / fₙ, ζ, Q, α, damped frequency, and bandwidth. Private, client-side. | Science & Engineering | Launch |
| ⭐ Lens / Mirror Equation Calculator | Thin lens & spherical mirror calculator for image distance, magnification, and image nature. Private, client-side. | Science & Engineering | Launch |
| ⭐ Ideal Gas Law Calculator (PV = nRT) | Solve for P, V, n, or T with friendly units and STP/SATP presets. Includes Boyle’s, Charles’s, and Gay-Lussac two-state calculators. Private, client-side. | Science & Engineering | Launch |
| ⭐ Torque & Moment of Inertia Calculator | Torque from force & lever arm; I for solid sphere, cylinder/disk, or thin rod; angular acceleration and rotational KE. Private, client-side. | Science & Engineering | Launch |
| ⭐ Torque Calculator – Force, Lever Arm & Unit Converter | Solve |τ| = rF sin(θ) for torque, force, or lever arm and convert among N·m, lbf·ft, lbf·in, ozf·in, kgf·m, and more. Private, client-side. | Science & Engineering | Launch |
| ⭐ Half-Life Calculator | Calculate remaining amount, elapsed time, half-life, decay constant, and percent remaining for exponential first-order decay. Client-side, private, and unit-aware. | Science & Engineering | Launch |
| ⭐ Redshift to Distance Calculator | Calculate Luminosity, Angular Diameter, and Comoving Distances from Redshift. | Science & Engineering | Launch |
| ⭐ De Broglie Wavelength Calculator | Matter-wave calculator using λ = h/(m·v); outputs in m/nm/pm plus momentum and KE, with an electron-vs-baseball comparison at the same speed. | Science & Engineering | Launch |
| ⭐ Photon Energy & Wavelength Calculator | Convert between photon energy, wavelength, and frequency (E = h·f, λ = c/f) with joules, eV, nm, Hz, and a visible spectrum marker. | Science & Engineering | Launch |
| ⭐ Compton Scattering Calculator | Compute Δλ = λC(1 − cos θ), final wavelength, and photon energy change for photon–electron scattering; includes X-ray backscatter and small-angle laser presets. | Science & Engineering | Launch |
| ⭐ Heisenberg Uncertainty Calculator | Check position–momentum and energy–time uncertainty against ħ/2, with minimum paired values, ratios, and a visual bound bar. | Science & Engineering | Launch |
| ⭐ Quantum Superposition State Visualizer | Bloch sphere plotter for single-qubit states from amplitudes or θ/φ, with live probabilities, presets, shareable links, and PNG export. | Science & Engineering | Launch |
| ⭐ Qubit vs Classical Bit Calculator | Show 2^n state growth, state-vector RAM at chosen bytes per amplitude, and how many qubits your available RAM can simulate (state-vector model). Runs entirely in your browser. | Science & Engineering | Launch |
| ⭐ Quantum Decoherence Time Calculator | Estimate collisional decoherence using pressure, temperature, particle size, Δx, and environment mass. Outputs collision rate, Γ, τ, and thermal λdB, with presets for air, vacuum, water, and space. | Science & Engineering | Launch |
| ⭐ Quantum Gate Truth Table Generator | Build 1–3 qubit circuits with Pauli, H, S/T, CNOT, CZ, and SWAP; see live truth tables, amplitudes, and Bell/GHZ/phase-kick presets. | Science & Engineering | Launch |
| ⭐ Quantum Tunneling Probability Calculator | Estimate barrier transmission with the textbook T ≈ exp(-2κa) for a 1D rectangular barrier. Enter mass (kg), barrier height and energy (eV), and width (nm); includes electron and alpha-decay examples. | Science & Engineering | Launch |
| ⭐ Quantum Entanglement Distance Calculator | Bell-CHSH S value with adjustable angles, distance, loss, detector efficiency, and visibility; shows coincidence rate and violation status. | Science & Engineering | Launch |
| ⭐ Casimir Effect Force Calculator | Compute Casimir vacuum pressure and force between parallel plates with unit-aware gap/area, a⁻⁴ scaling bar, and nano/micro presets. | Science & Engineering | Launch |
| ⭐ Zero-Point Energy Calculator | Estimate vacuum zero-point energy from density × volume with cosmological presets, mass equivalent, battery comparison, and optional cutoff model. | Science & Engineering | Launch |
| ⭐ Schrodinger Equation Solver (1D Box) | Infinite square-well energies E_n = n²h²/(8mL²), normalized wavefunctions, |psi|² visualization, and an energy ladder. | Science & Engineering | Launch |
| ⭐ Space Unit Converter | Instantly convert between Astronomical Units (AU), Light-Years (ly), Parsecs (pc), and Kilometers (km). | Science & Engineering | Launch |
| ⭐ Cosmology Calculator (Age & Distance) | Calculate the age of the universe and cosmic distances for a given redshift. | Science & Engineering | Launch |
| ⭐ Rocket Delta-V Calculator | Compute rocket Δv with up to 4 stages using the Tsiolkovsky equation — per-stage and total results with chart. | Science & Engineering | Launch |
| ⭐ Satellite Orbit Period Calculator | Enter altitude to calculate orbital period, orbital velocity, and revolutions per day using Kepler’s Third Law. | Science & Engineering | Launch |
| ⭐ Hohmann Transfer Calculator | Compute Δv₁, Δv₂, total Δv, and transfer time between circular orbits. Optional plane-change combination. | Science & Engineering | Launch |
| ⭐ Conway’s Game of Life | Interactive pixel-grid simulator of Conway’s Game of Life — draw, run, pause, and explore emergent patterns. | Science & Engineering | Launch |
| ⭐ Ant Colony Simulator | Interactive simulation of ant foraging behavior — watch pheromone trails emerge and tweak evaporation, diffusion, and agent count. | Science & Engineering | Launch |
| ⭐ Population Growth Simulator | Exponential vs logistic growth with adjustable N₀, r, K, Δt, and noise. Live chart, stats, and export. Private, client-side. | Science & Engineering | Launch |
| ⭐ Markov Chain Random Walk | Build a transition matrix and simulate random walks. Path preview, visit statistics, CSV/JSON export. Private, client-side. | Science & Engineering | Launch |
| ⭐ Fractal Generator | Explore Mandelbrot, Julia, Burning Ship, and Tricorn fractals with presets, zoom controls, palettes, PNG export, and shareable URLs. | Science & Engineering | Launch |
| ⭐ Escape Velocity Calculator | Compute escape velocity at any altitude and see circular speed (v_circ) with the √2 relationship. Supports Earth, Moon, Mars, or custom body. Private, client-side. | Science & Engineering | Launch |
| ⭐ Blackbody Radiation Calculator | Compute peak wavelength via Wien’s law and radiated power via Stefan–Boltzmann; optional emissivity & area; client-side and private. | Science & Engineering | Launch |
| ⭐ COSMOTOOLS — Modern Cosmology Calculator | Luminosity, comoving & angular distances, lookback time, age, q0 & Ωk with adjustable H0, ΩM, ΩΛ. Private, client-side. | Science & Engineering | Launch |
| ⭐ Compound Interest Calculator | Project your financial growth with contributions and inflation adjustment. | Financial Calculators | Launch |
| ⭐ Future Value Calculator | Estimate future value with recurring deposits, compounding, contribution timing, inflation, and fees. | Financial Calculators | Launch |
| ⭐ Present Value Calculator | Discount a future target to today's value with planned contributions, compounding, inflation context, and fees. | Financial Calculators | Launch |
| ⭐ Compound Interest Table Generator | Generate tables across rates (0.25%–100%) with custom step, EAR/APR conversion, CSV export, and an interactive graph. | Financial Calculators | Launch |
| ⭐ Salary to Hourly Converter | Convert annual salaries to hourly wages and vice versa, with after-tax estimation. | Financial Calculators | Launch |
| ⭐ Hourly → Annual Salary Calculator | Convert hourly wages into weekly, monthly, and annual salaries with optional after-tax estimate. | Financial Calculators | Launch |
| ⭐ Net Income Calculator | Compute Net Income and NOPAT from EBIT/EBT or a full operating layout; shows EBITDA, EBT, taxes, and margins — 100% client-side. | Financial Calculators | Launch |
| ⭐ EBIT & EBITDA Calculator | Calculate EBITDA and EBIT from revenue/costs or direct inputs. Includes D&A, other operating, and profit margins. Private, client-side. | Financial Calculators | Launch |
| ⭐ Savings Goal / Sinking Fund | Set a target and plan by date or monthly budget — includes progress bar, live chart, and CSV schedule. | Financial Calculators | Launch |
| ⭐ Savings vs. Investing Comparison | Side-by-side cash vs. investing with breakeven timing, “today’s money,” optional uncertainty band, and downloadable CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Inflation-Adjusted Return (Real Return) Calculator | Real return from nominal & inflation (Fisher), real CAGR from CPI, plus required nominal for a target real. Private, client-side. | Financial Calculators | Launch |
| ⭐ Retirement Withdrawal / 4% Rule Simulator | Classic 4% rule with inflation indexing, flat £ withdrawals, or % of portfolio. Monthly compounding, COLA, live chart, and depletion check. Private, client-side. | Financial Calculators | Launch |
| ⭐ Rebalancing Impact Calculator | See how periodic or threshold rebalancing compares to Buy & Hold—CAGR, volatility, drawdowns, turnover, and trading costs. Private, client-side. | Financial Calculators | Launch |
| ⭐ Investment Goal Tracker | Plan an investment goal by date or budget with return, fees, inflation, and optional volatility. Live chart, success probability, CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Dividend Reinvestment (DRIP) Calculator | Simulate dividend reinvestment with yield or DPS, dividend & price growth, tax rate, frequency, and monthly contributions. Fractional shares, live chart, CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Time-Weighted Return (TWR) Calculator | Compute TWR by linking subperiod returns or via Modified Dietz when flows occur within periods. Growth chart, CAGR, CSV. Private, client-side. | Financial Calculators | Launch |
| 💼 Portfolio Return (Weighted Average ROI) Calculator | Compute per-holding ROI plus invested-weighted and value-weighted portfolio returns. Add fees & income, optional date range for CAGR. Private, client-side. | Financial Calculators | Launch |
| ⭐ Budget Planner — 50/30/20 Rule | Build a monthly budget with Needs/Wants/Saving targets, live totals, progress bars, and a donut chart. Private, client-side. | Financial Calculators | Launch |
| ⭐ Emergency Fund Calculator | Estimate your target emergency fund from essential expenses, see current coverage and time-to-goal, with a projection chart. Private, client-side. | Financial Calculators | Launch |
| ⭐ 401(k) Calculator | Project employee deferrals, employer match, IRS limits, inflation-adjusted balance, and retirement withdrawals. Private, client-side. | Financial Calculators | Launch |
| ⭐ Retirement Planner | Plan for retirement with sliders for savings, age, returns, and inflation — includes live growth chart. | Financial Calculators | Launch |
| ⭐ FIRE Calculator | Calculate your FI number and projected date using SWR, contributions, returns, and inflation—complete with a live growth chart. Private, client-side. | Financial Calculators | Launch |
| ⭐ Salary to Hourly Converter | Convert annual salaries to hourly wages and vice versa, with after-tax estimation. | Financial Calculators | Launch |
| ⭐ Inflation Calculator | Adjust money across years using CPI, compute Fisher inflation and forward rates — all client-side. | Financial Calculators | Launch |
| ⭐ PPP Calculator — Purchasing Power Parity | Convert amounts with PPP conversion factors or CPI + FX; privacy-first, 100% client-side. | Financial Calculators | Launch |
| 💱 Interest Rate Parity Calculator | Price FX forwards with covered IRP, solve implied rates from spot/forward, or estimate expected spot via UIP. Private, client-side. | Financial Calculators | Launch |
| 📈 Real GDP Growth Adjustment Calculator | Convert nominal GDP growth to real using inflation (Fisher), compute real growth from levels + deflators, and chain multi-period real growth. Private, client-side. | Financial Calculators | Launch |
| 💷 Inflation Impact on Salary | Compute real raises vs inflation, break-even raises, CPI-based adjustments between dates, and chain multi-year purchasing power. Private, client-side. | Financial Calculators | Launch |
| 🌍 Exchange Rate Impact on Investments | Unhedged vs hedged returns, FX decomposition, scenarios, and break-even FX—private, client-side. | Financial Calculators | Launch |
| ⭐ Cash Conversion Cycle (CCC) Calculator | Compute DIO, DSO, DPO, and overall CCC days. Includes turnovers, date or length mode. 100% client-side. | Financial Calculators | Launch |
| ⭐ Bond Calculator v1.1 | A simple financial tool to calculate a bond's price, yield, coupon, or maturity. | Financial Calculators | Launch |
| ⭐ Stock Return Calculator | CAGR and total return with dividends; DRIP option, dividend tax, equity curve, and cash-flow CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Temperature Converter | Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur. | Calculators | Launch |
| ⭐ 2D Distance Calculator | Calculate the distance between two points (x1, y1) and (x2, y2) on a 2D plane. | Calculators | Launch |
| ⭐ 3D Distance Calculator | Calculate the distance between two points (x1, y1, z1) and (x2, y2, z2). | Calculators | Launch |
| ⭐ Midpoint Calculator (2D & 3D) | Compute the midpoint between two points in 2D or 3D with an isometric preview. Private, client-side. | Geometry | Launch |
| ⭐ Line Intersection Calculator | Solve for the intersection of two linear equations (Ax+By=C or y=mx+b). Flags parallel or coincident lines. Private, client-side. | Geometry | Launch |
| ⭐ Vector Projection / Dot & Cross Product | Compute dot, cross (3D), projection of a onto b, angle, magnitudes, and parallel/perpendicular components. 2D & 3D. Private, client-side. | Calculators | Launch |
| ⭐ Cross Product Calculator for 3D Vectors | Calculate A × B with determinant steps, magnitude, unit normal, angle, areas, and perpendicularity checks. Private, client-side. | Calculators | Launch |
| ⭐ Coordinate Transformations (2D) | Translate, rotate (about origin or a point), reflect (axes, y=x, y=−x, angle), and scale (uniform/non-uniform) with live preview. Private, client-side. | Calculators | Launch |
| ⭐ Slope Calculator | Compute slope m, angle, and line equations (y=mx+b, point–slope, Ax+By=C) between two points. Handles vertical lines. Private, client-side. | Geometry | Launch |
| ⭐ Vector Component Resolver (2D/3D) | Compute x/y(/z) components, |a|, unit vector, projection of a onto b, and rejection. Supports component or magnitude+angles input. Private, client-side. | Geometry | Launch |
| 📐 Angle Between Two Vectors | 2D & 3D vector angle (deg/rad), cosine similarity, dot product, magnitudes. Private, client-side. | Calculators | Launch |
| ⭐ Rotation Matrix Calculator (2D) | Build the 2×2 rotation matrix R(θ) and rotate points CW/CCW about the origin or any center. Paste a list for batch rotation. Private, client-side. | Calculators | Launch |
| ⭐ Point to Line Distance (2D) | Perpendicular distance from a point to a line in Ax+By+C=0, y=mx+b, or via two points. Private, client-side. | Geometry | Launch |
| ⭐ Point to Plane Distance (3D) | Perpendicular distance from a 3D point to a plane. Supports Ax+By+Cz+D=0, point+normal, or three points; shows foot and signed/unsigned distance. Private, client-side. | Science & Engineering | Launch |
| ⭐ Plane from 3 Points | Compute a plane from three points or point+normal; outputs Ax+By+Cz+D=0, unit-normal form, and point–normal form. Private, client-side. | Science & Engineering | Launch |
| ⭐ Golden Ratio Calculator | Compute golden sections a, b, and L using φ with a live golden-rectangle preview. Private, client-side. | Geometry | Launch |
| ⭐ Tire Size Calculator | Compare two tire sizes by sidewall, diameter, circumference, revs per mile/km, ride height, and speedometer error. | Calculators | Launch |
| ⭐ IP Subnet Calculator | Enter IPv4 or IPv6 CIDR to instantly see network address, range, usable hosts, and total addresses — all calculated client-side. | Calculators | Launch |
| ⭐ Ohm’s Law Calculator | Enter any two values (Voltage, Current, Resistance, Power) to instantly calculate the other two — with unit scaling and step-by-step formulas. 100% client-side. | Science & Engineering | Launch |
| ⭐ AC Power Calculator | Calculate real (P), apparent (S), and reactive (Q) power from voltage, current, and power factor or angle — supports single-phase and three-phase. 100% client-side. | Science & Engineering | Launch |
| ⭐ DC Power Calculator | Compute direct current power with P = V × I — enter any two values (Voltage, Current, Resistance, Power) to instantly find the others. 100% client-side. | Science & Engineering | Launch |
| ⭐ dB / dBm / Watt Converter | Convert between dB, dBm, dBW, and Watts — with optional Vrms/Vpp/Irms from a chosen impedance (e.g., 50 Ω). Enter one value, get the rest. 100% client-side. | Science & Engineering | Launch |
| ⭐ Wavelength ↔ Frequency Calculator | Convert between wavelength (λ) and frequency (f) using λ = c/(n·f) with medium presets (vacuum, air, water, glass) or custom refractive index. Also shows period, wavenumber, and photon energy. 100% client-side. | Science & Engineering | Launch |
| ⭐ Voltage Divider Calculator | Enter any three of Vin, Vout, R1, and R2 to solve the fourth. Includes optional load (RL) simulation, divider current, and resistor power — 100% client-side. | Science & Engineering | Launch |
| ⭐ Paint, Flooring & Tile Coverage Calculator | Calculate paint litres and tins, flooring area and packs, plus tile counts and boxes. Multiple rooms, coats & waste. Private, client-side. | Construction Tools | Launch |
| ⭐ Stucco and Plaster Calculator | Estimate wall area, coats, wet volume, bags, waste, and optional cost for stucco, plaster, render, and skim-coat work. Private, client-side. | Construction Tools | Launch |
| ⭐ Caulk and Sealant Calculator | Calculate caulk and sealant tubes from joint length, width, depth, bead shape, package size, waste, and optional cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Square Footage Calculator | Calculate square footage for rooms, floors, walls, circles, triangles, and custom areas with waste and export controls. | Construction Tools | Launch |
| ⭐ Packing Volume Calculator | Estimate boxes for moving & shipping from item dimensions and quantities. Packing efficiency, fragile padding, weights, and printable summary. Private, client-side. | Logistics & Supply Chain Tools | Launch |
| ⭐ Fabric Yardage Calculator | Estimate yardage/metreage with fabric width, seam/hem allowances, nap, vertical repeat, shrinkage, and store rounding. Private, client-side. | Calculators | Launch |
| ⭐ Concrete Yardage Calculator | Slabs, footings, sonotubes/post holes. Imperial/metric, waste %, and bag counts. Private, client-side. | Construction Tools | Launch |
| ⭐ Post Hole Concrete Calculator | Calculate concrete bags from post hole diameter, depth, post displacement, bag yield, waste, and optional cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Formwork Calculator | Estimate concrete form boards, stakes, braces, fasteners, form oil, waste, and optional material cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Pool Volume Calculator | Calculate pool volume in gallons, litres, cubic feet, and cubic metres with a ppm-based dose helper. | Construction Tools | Launch |
| ⭐ Concrete Mixer Ratio Calculator | Compute cement, sand, aggregate, water, and bag counts for any volume. Presets (1:2:3, 1:1.5:3, 1:3:5, 1:4:8) plus custom ratios. Client-side. | Calculators | Launch |
| ⭐ Gravel/Aggregate Coverage Calculator | Calculate tons or cubic yards of gravel, sand, or mulch for driveways, paths, and landscaping with optional compaction settings. Private, client-side. | Calculators | Launch |
| ⭐ Insulation R-Value Calculator | Calculate cumulative R-value for wall/ceiling assemblies. Select materials (fiberglass, foam, etc.) and thickness. Private, client-side. | Calculators | Launch |
| ⭐ Window U-Value Calculator | Convert between U-values (Imperial/Metric) and R-values for windows. Private, client-side. | Calculators | Launch |
| ⭐ Deck Load Capacity Calculator | Estimate allowed deck joist spans based on residential code (40 PSF Live / 10 PSF Dead). Private, client-side. | Calculators | Launch |
| ⭐ Deck Board Calculator | Estimate deck boards, board rows, fasteners, screw boxes, picture-frame borders, gap spacing, waste, and optional material cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Baseboard and Trim Calculator | Estimate baseboard, casing, shoe molding, stock pieces, waste allowance, spare length, joints, and optional material cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Lumber Board Feet Calculator | Board feet (FBM) from quantity, thickness, width, and length plus optional cost estimate. Supports decimals and nominal vs. actual sizing. Client-side. | Calculators | Launch |
| ⭐ Rebar Spacing Calculator | Plan slab reinforcement with bar counts, total length, and steel weight by spacing, cover, and bar size (#3–#6). Client-side. | Calculators | Launch |
| ⭐ Roof Pitch Calculator | Convert rise/run to pitch (/12), degrees, and percent grade. Normalizes any run, shows angle and slope instantly. Client-side. | Calculators | Launch |
| ⭐ Stair Tread & Riser Calculator | Riser count, exact height, tread depth (2R+T≈25), and total run from your total rise and target riser height. Client-side. | Calculators | Launch |
| ⭐ Drywall / Sheetrock Estimator | Walls and ceilings: area plus 4x8 and 4x12 sheet counts with ~10% waste. Toggle ceiling inclusion. Client-side. | Calculators | Launch |
| ⭐ HVAC BTU Calculator | Estimate room cooling & heating loads, convert to AC tons, and apply sun/insulation/occupancy adjustments. Private, client-side. | Construction Tools | Launch |
| ⭐ Compound Miter Crown Molding Calculator | Compute compound miter and bevel angles from corner and spring angles, with optional molding width. Private, client-side. | Construction Tools | Launch |
| ⭐ Baluster & Spindle Spacing Calculator | Estimate baluster count, exact gaps, and on-center spacing to meet code limits. Private, client-side. | Construction Tools | Launch |
| ⭐ Stud Wall Framing Calculator | Estimate stud counts, plate length, and board feet with spacing, corners, intersections, and waste factor. Private, client-side. | Construction Tools | Launch |
| ⭐ Excavation Swell Load Calculator | Calculate bank vs loose volume with soil swell factors and truck load counts. Private, client-side. | Construction Tools | Launch |
| ⭐ Brick and Mortar Calculator | Estimate brick count and mortar volume by brick size and joint thickness. Private, client-side. | Construction Tools | Launch |
| ⭐ Concrete Block Wall Calculator | Estimate CMU block count, mortar, grout/core fill, rebar, bag counts, waste, and cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Retaining Wall Block Calculator | Estimate retaining wall blocks, cap units, base gravel, drainage stone, drain pipe, waste, tonnage, and cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Wallpaper Pattern Repeat Calculator | Estimate rolls, strips per roll, and waste based on pattern repeat and wall height. Private, client-side. | Construction Tools | Launch |
| ⭐ Asphalt Hot Mix & Sealer Calculator | Estimate hot mix tonnage, volume, and optional sealer buckets from area and thickness. Private, client-side. | Construction Tools | Launch |
| ⭐ Paver Sand & Gravel Calculator | Estimate paver count, gravel base, and bedding sand volumes for patios and walkways. Private, client-side. | Construction Tools | Launch |
| ⭐ Roof Gutter & Downspout Sizing Calculator | Estimate runoff rate, gutter size, and downspout count from roof area and rainfall intensity. Private, client-side. | Construction Tools | Launch |
| ⭐ Roof Shingle Calculator | Estimate asphalt shingle bundles, roofing squares, waste, and spare coverage from roof area or footprint and pitch. Private, client-side. | Construction Tools | Launch |
| ⭐ Siding Calculator | Estimate siding boards, panels, corner trim pieces, siding squares, and waste allowance. Private, client-side. | Construction Tools | Launch |
| ⭐ Plywood and OSB Sheathing Calculator | Estimate sheathing sheets, waste-adjusted coverage, fasteners, panel clips, weight, and optional material cost. Private, client-side. | Construction Tools | Launch |
| ⭐ Fence Material Calculator | Estimate fence posts, rails, pickets, gate openings, hardware sets, concrete bags, and waste allowance. Private, client-side. | Construction Tools | Launch |
| ⭐ Ceramic Tile Grout Calculator | Estimate grout volume and dry mix weight from tile size, thickness, joint width, and area. Private, client-side. | Construction Tools | Launch |
| ⭐ Acoustic Impedance Calculator | z=ρc (Rayl), tube impedance Zc=ρc/S, wavelength, and interface reflection/transmission at normal incidence. Client-side. | Science & Engineering | Launch |
| ⭐ Air — Speed of Sound vs. Temperature | Compute speed of sound from temperature with optional RH & pressure. Linear approximation + moist-air model. Client-side. | Science & Engineering | Launch |
| ⭐ Gases – Speed of Sound | Quick reference: sound speed in gases with search, unit switching, and √T temperature normalization. Private, client-side. | Science & Engineering | Launch |
| ⭐ Fans — Noise Power Generation | Empirical overall sound power level from S, Q, p. SI & Imperial inputs. Client-side. | Science & Engineering | Launch |
| ⭐ Floor Vibrations — Resonance Check | Compute first-mode frequency for joist floors or slabs and check resonance risk vs. human activity & machinery. Private, client-side. | Science & Engineering | Launch |
| ⭐ Doppler Effect Calculator | Calculate observed sound frequency, frequency shift, and percent pitch change for moving sources and observers. | Science & Engineering | Launch |
| ⭐ Random Number Generator | Generate a random number within a custom range and with a specific number of decimal points. | Random Generators | Launch |
| ⭐ Number Set Generator | Generate integer or decimal sets — unique or with repeats, optional step/grid, sorting, and export. | Random Generators | Launch |
| ⭐ Random Choice Generator | Randomly pick a choice from a list of options. | Random Generators | Launch |
| ⭐ Random letter Generator | Generate a single random letter from the alphabet. | Random Generators | Launch |
| ⭐ Random date Generator | Generate one or more random dates within a specified range. | Random Generators | Launch |
| ⭐ Random IP Address Generator | Generate random IPv4 addresses with options to exclude private and broadcast ranges. | Random Generators | Launch |
| ⭐ Random MAC Address Generator | Generate random MAC (EUI-48) addresses with format & case options, unicast/multicast and U/L bit control, plus optional vendor OUI seeding. | Random Generators | Launch |
| ⭐ List Randomizer | Shuffle a list of items, names, or any text into a random order. | Random Generators | Launch |
| ⭐ Strong Password Generator | Generate a secure, random password with customizable length and character sets. | Random Generators | Launch |
| 🎲 UUID v1 Generator | Generate time-based UUID v1 (RFC 4122) with clock sequence and node. Batch 1–200, multiple formats, copy/download. Private, client-side. | Random Generators | Launch |
| 🎲 UUID v3 Generator | Create deterministic UUID v3 (MD5) from a namespace and name. Built-in DNS/URL/OID/X.500 or custom, batch 1–200, multiple formats. Private, client-side. | Random Generators | Launch |
| ⭐ UUID v4 Generator | Generate one or many RFC 4122 compliant UUIDv4 identifiers with color-coded parts. | Random Generators | Launch |
| 🎲 UUID v5 Generator | Create deterministic UUID v5 (SHA-1) from a namespace and name. Built-in DNS/URL/OID/X.500 or custom, batch 1–200, multiple formats. Private, client-side. | Random Generators | Launch |
| 🎲 UUID v7 Generator | Generate time-ordered RFC 9562 UUID v7 identifiers, export batches, and decode embedded Unix timestamps. Private, client-side. | Random Generators | Launch |
| ⭐ Dice Roller | Rolls a customizable number of d6 dice with a visual display and total sum. | Random Generators | Launch |
| ⭐ Coin Flipper | A simple tool to flip a coin for a heads or tails decision. | Random Generators | Launch |
| ⭐ Bingo Card Generator | Create and print unique, random 5x5 bingo cards with a free space. | Random Generators | Launch |
| 🧩 Printable Sudoku Generator | Generate printable 9×9 Sudoku puzzles (Easy/Medium/Hard). Save as PNG/PDF or print — fully client-side. | Random Generators | Launch |
| 🌀 Random Maze Generator | Generate printable mazes with custom size & cell width, entrance/exit options, solution overlay, and braid (loops). Save as PNG/PDF or print — fully client-side. | Random Generators | Launch |
| ✨ Kaleidoscope Pattern | Soothing, seedable kaleidoscope with gentle rotation. Choose slices, palette, speed & breathing; switch to Draw mode for mirrored strokes with per-stroke colours. Mobile-friendly and 100% client-side. | Random Generators | Launch |
| 🎡 Spin the Wheel — Random Picker | Paste options and spin to pick a fair random winner. Private, client-side; optional no-repeat draws and copyable history. | Random Generators | Launch |
| ⭐ Random Astronomy Sky Map Generator | Generate a seeded star chart with adjustable star count, brightness curve, optional RA/Dec grid, and PNG export. Private, client-side. | Science & Engineering | Launch |
| ⭐ Random Color Palette Generator | Generate harmonizing color palettes for your designs and lock in colors you like. | Random Generators | Launch |
| 🎮 Tic Tac Toe | Classic 3×3 Tic Tac Toe game — play vs friend or computer (Easy, Normal, Unbeatable), choose X/O, track scores. | Games | Launch |
| 🧊 3D Tic Tac Toe | Three stacked 3×3 layers vs computer: clickable isometric board, smart blocking AI, win-line highlights, and mobile-friendly controls. Related: Classic Tic Tac Toe. | Games | Launch |
| 🎲 2048 Game | Play the classic 4×4 2048 puzzle — slide tiles, merge numbers, use Undo, and aim for 2048. Smooth, mobile-friendly, ad-light. | Games | Launch |
| 🧩 Sudoku | Play Sudoku — Easy/Medium/Hard with notes, hints, undo, timer, and error highlighting. Mobile-first and privacy-friendly. | Games | Launch |
| 🧠 Mental Math Trainer | Practice percentages, fractions, and squares — play Practice or 60/120s speed rounds with gentle feedback, skip, and local bests. Keyboard-friendly and private. | Games | Launch |
| 🍕 Fraction Pizza | Visualize fractions—choose slices, click to fill, and see fraction/decimal/percent update instantly. Kid-friendly, Challenge mode, privacy-first. | Games | Launch |
| ⌨️ Typing Test | 1-minute typing test with live WPM & accuracy graph, gentle feedback, restart, and a printable certificate. Privacy-first, runs client-side. | Games | Launch |
| 🔎 Word Search | Play or build custom word searches — your word list, grid 8–20, diagonals/backwards options, highlights, and printable PDF/PNG (Classroom pack). Privacy-first, all client-side. | Games | Launch |
| 💣 Flagsweeper | Classic Flagsweeper with a gentle layout, Flag Mode for touch, right-click flags on desktop, timer, remaining mines, and first-click safety. Runs fully client-side for privacy. | Games | Launch |
| 😀 Emoji Catcher | Gentle typing game for kids: type the word on each falling emoji to catch it. One emoji at a time, slower pace for longer words, lives, and scoring by word length. Fully client-side and private. | Games | Launch |
| 🎯 Pachinko Probability (Galton Board) | Interactive Pachinko/Galton board: drop balls through pegs to see a live distribution. Adjustable rows, bias (p), speed, and spawn rate; pseudo-physics arcs with histogram + binomial overlay, mean/SD stats. 100% client-side. | Games | Launch |
| 🧩 Towers of Hanoi | Calm, privacy-first Hanoi puzzle: manual tap/tap moves or auto-solver. Adjustable disks (3–8), speed control, move counter & optimal target (2^n−1), keyboard & screen-reader friendly. 100% client-side. | Games | Launch |
| 🌀 Maze (Playable) | Calm, privacy-first maze game: swipe or use the D-pad/arrow keys. Seeded generator, sizes (15×15–31×31), timer & steps, crumb trail, and brief hint overlay. Keyboard & screen-reader friendly. 100% client-side. | Games | Launch |
| 🧠 Memory Match — Animal Emoji | Flip cards to match pairs. 4×4–6×6 boards, timer, moves, star rating, and local best times. Private, client-side. | Games | Launch |
| ⭐ Little Star Glider | Tap to nudge a star through soft cloud gaps. Simple, cozy arcade with score & best. Private, client-side. | Games | Launch |
| ⭐ EOQ Calculator | Calculate economic order quantity, order frequency, and ordering vs holding costs. | Logistics & Supply Chain Tools | Launch |
| ⭐ Reorder Point Calculator | Set reorder thresholds using average demand, lead time, and safety stock. | Logistics & Supply Chain Tools | Launch |
| ⭐ Safety Stock Calculator | Compute safety stock from demand variability, lead time, and service level. | Logistics & Supply Chain Tools | Launch |
| ⭐ Inventory Turnover Calculator | Measure how often inventory sells through across a period. | Logistics & Supply Chain Tools | Launch |
| ⭐ Days Inventory Outstanding Calculator | Convert inventory value into days of stock on hand for the period. | Logistics & Supply Chain Tools | Launch |
| ⭐ Freight Cost Calculator | Estimate linehaul, fuel surcharge, and accessorial fees for shipments. | Logistics & Supply Chain Tools | Launch |
| ⭐ Cost Per Mile Calculator | Turn total trip cost into cost per mile and cost per kilometer. | Logistics & Supply Chain Tools | Launch |
| ⭐ Fuel Cost Estimator | Estimate fuel usage and total fuel spend for a route. | Logistics & Supply Chain Tools | Launch |
| ⭐ Load Utilization Calculator | Compare weight and volume utilization to identify your limiting capacity. | Logistics & Supply Chain Tools | Launch |
| ⭐ Pallet Calculator | Calculate cases per pallet, stack height, loaded weight, full pallets, and remainder cases. | Logistics & Supply Chain Tools | Launch |
| ⭐ Travel Packing List Generator | Create a private printable packing checklist from trip length, travelers, climate, luggage, lodging, laundry, and activities. | Logistics & Supply Chain Tools | Launch |
| ⭐ Per Diem & Travel Budget Calculator | Estimate travel allowance, meals and incidentals, lodging, taxes, transport, and other trip costs. | Logistics & Supply Chain Tools | Launch |
| ⭐ Lead Time Calculator | Combine processing, production, transit, and receiving time into one lead time. | Logistics & Supply Chain Tools | Launch |
| ⭐ Warehouse Space Requirement Calculator | Estimate pallet storage area with stacking, utilization, and aisle allowances. | Logistics & Supply Chain Tools | Launch |
| ⭐ Order Picking Time Estimator | Estimate daily pick hours and staffing from orders, lines, and pick rate. | Logistics & Supply Chain Tools | Launch |
| ⭐ Labor Productivity Calculator | Compute units per hour, cost per unit, and effective output after rework. | Logistics & Supply Chain Tools | Launch |
| ⭐ Lead Time Calculator (Extended) | Add port handling and customs to get a full end-to-end lead time. | Logistics & Supply Chain Tools | Launch |
| ⭐ Fill Rate Calculator | Measure unit or order fill rate with shortfall and service interpretation. | Logistics & Supply Chain Tools | Launch |
| ⭐ Perfect Order Rate Calculator | Combine on-time, complete, and damage-free rates into one perfect order rate. | Logistics & Supply Chain Tools | Launch |
| ⭐ Total Landed Cost Calculator | Estimate total and per-unit landed cost with freight and handling fees. | Logistics & Supply Chain Tools | Launch |
| ⭐ Shipment Emissions Calculator (Basic) | Estimate CO2e using distance, mode, weight, and editable factors. | Logistics & Supply Chain Tools | Launch |
| ⭐ Make vs Buy Cost Comparison | Compare internal and supplier cost totals with break-even volume. | Logistics & Supply Chain Tools | Launch |
| ⭐ Demand Forecast Error (MAPE) Calculator | Calculate MAPE and review per-period APE values from pasted series. | Logistics & Supply Chain Tools | Launch |
| ⭐ Server Power Consumption Estimator | Estimate daily and monthly server energy use with redundancy, efficiency, utilization, and losses. | Infrastructure & Systems Tools | Launch |
| ⭐ Server Refresh Cost Planner | Plan server lifecycle refresh budget, warranty gap, replacement reserve, support exposure, and energy cost. | Infrastructure & Systems Tools | Launch |
| ⭐ Battery Runtime Estimator | Estimate usable Wh and runtime from voltage, Ah, efficiency, depth of discharge, and aging. | Infrastructure & Systems Tools | Launch |
| ⭐ Generator Sizing (Basic) | Size generator kVA and kW from running load, surge factor, power factor, and headroom. | Infrastructure & Systems Tools | Launch |
| ⭐ Generator Fuel Consumption / Runtime / Cost Calculator | Estimate fuel burn, usable runtime, and operating cost from tank size, burn rate, load, and fuel price. | Infrastructure & Systems Tools | Launch |
| ⭐ Storage Capacity Planner | Plan raw and usable storage from retention, replication, compression, overhead, and growth. | Infrastructure & Systems Tools | Launch |
| ⭐ Backup Window Calculator | Estimate backup duration from size, throughput, compression, incremental percent, and overhead. | Infrastructure & Systems Tools | Launch |
| ⭐ RAID Calculator | Estimate usable capacity, redundancy overhead, and fault tolerance for RAID 0, 1, 5, 6, 10, 50, and 60. | Infrastructure & Systems Tools | Launch |
| ⭐ Disk IOPS Calculator | Plan RAID, SSD, and workload throughput using random IOPS, write penalty, read/write mix, and block size. | Infrastructure & Systems Tools | Launch |
| ⭐ UPS Runtime & Sizing Calculator | Estimate UPS runtime, required battery capacity, and proper kVA sizing from load, voltage, and backup needs. | Infrastructure & Systems Tools | Launch |
| ⭐ Network Throughput Planner | Calculate required uplink and downlink capacity using users, peak factor, overhead, and utilization. | Infrastructure & Systems Tools | Launch |
| ⭐ Switch Port Utilization Calculator | Calculate access-port utilization, uplink capacity, spare ports, projected growth margin, and additional switch needs. | Infrastructure & Systems Tools | Launch |
| ⭐ Network Latency Budget Calculator | Plan link delay, jitter allowance, RTT, bandwidth-delay product, and application SLA margin. | Infrastructure & Systems Tools | Launch |
| ⭐ NTP Time Drift Calculator | Calculate NTP clock offset, oscillator drift, safe sync interval, holdover error, and tolerance margin. | Infrastructure & Systems Tools | Launch |
| ⭐ DNS TTL Propagation Calculator | Plan DNS cache expiry, TTL lowering lead time, post-cutover stale answers, negative caching, and rollback exposure. | Infrastructure & Systems Tools | Launch |
| ⭐ SSL Certificate Expiry Calendar Generator | Generate TLS certificate renewal windows, alert dates, and downloadable calendar events from an expiry date. | Infrastructure & Systems Tools | Launch |
| ⭐ Wi-Fi Access Point Capacity Planner | Estimate Wi-Fi AP count from users, active throughput, airtime capacity, coverage area, and zones. | Infrastructure & Systems Tools | Launch |
| ⭐ Bandwidth Calculator | Calculate transfer time, required bandwidth, effective throughput, and data moved from size, speed, overhead, and efficiency. | Infrastructure & Systems Tools | Launch |
| ⭐ Packets Per Second Calculator | Calculate Ethernet PPS and Mpps from bandwidth, frame size, VLAN, preamble, FCS, and inter-frame gap overhead. | Infrastructure & Systems Tools | Launch |
| ⭐ MTU and Packet Overhead Calculator | Calculate effective MTU, TCP MSS, UDP payload, Ethernet wire overhead, VLAN tags, VPN tunnels, VXLAN, GRE, PPPoE, and jumbo frame requirements. | Infrastructure & Systems Tools | Launch |
| ⭐ Load Balancer Capacity Calculator | Size load balancer nodes from requests, connections, throughput, utilization, headroom, and failover reserve. | Infrastructure & Systems Tools | Launch |
| ⭐ Firewall Rule Capacity Planner | Plan firewall policy, object, and change workload capacity with cleanup targets and runway forecasts. | Infrastructure & Systems Tools | Launch |
| ⭐ VM Consolidation Ratio Calculator | Plan VM density from CPU cores, RAM, oversubscription ratios, HA reserve, utilization targets, and growth. | Infrastructure & Systems Tools | Launch |
| ⭐ DHCP Scope Calculator | Size DHCP pools from subnet prefix, reservations, exclusions, lease time, churn, headroom, and utilization. | Infrastructure & Systems Tools | Launch |
| ⭐ IP Address Utilization Tracker | Track IPv4 used, reserved, unavailable, and available hosts with CIDR ranges and utilization thresholds. | Infrastructure & Systems Tools | Launch |
| ⭐ VLAN and IP Address Plan Generator | Generate VLAN IDs, IPv4 subnets, gateways, usable ranges, DHCP pools, masks, and broadcast addresses. | Infrastructure & Systems Tools | Launch |
| ⭐ BGP Prefix Aggregation Calculator | Summarize IPv4 and IPv6 CIDRs, remove contained routes, compare covering prefixes, and count route reduction. | Infrastructure & Systems Tools | Launch |
| ⭐ Replication Bandwidth Calculator | Size WAN bandwidth from RPO, change rate, reduction, overhead, headroom, and catch-up backlog. | Infrastructure & Systems Tools | Launch |
| ⭐ WAN Failover Capacity Calculator | Plan backup WAN capacity from traffic priority, retained load, link efficiency, and failover headroom. | Infrastructure & Systems Tools | Launch |
| ⭐ PoE Budget + Voltage Drop Calculator | Estimate switch PoE budget, per-port source watts, cable loss, and powered-device voltage for 802.3af, 802.3at, and 802.3bt links. | Infrastructure & Systems Tools | Launch |
| ⭐ Patch Panel Port Count Planner | Plan patch panels, switch ports, cable drops, rack units, labels, patch cords, and spare growth capacity. | Infrastructure & Systems Tools | Launch |
| ⭐ Cable Tray Fill Calculator | Calculate cable tray fill percentage, remaining area, and added capacity for network, fiber, control, and power cables. | Infrastructure & Systems Tools | Launch |
| ⭐ Fiber Optic Loss / Optical Power Budget Calculator | Estimate attenuation, connector and splice loss, received optical power, design margin, and maximum fiber reach. | Infrastructure & Systems Tools | Launch |
| ⭐ Rack Space (U Height) Calculator | Sum device U heights, reserves, and growth to estimate rack count and utilization. | Infrastructure & Systems Tools | Launch |
| ⭐ Rack Elevation Planner | Lay out rack equipment by U position, reserved space, rack depth clearance, and exportable elevation results. | Infrastructure & Systems Tools | Launch |
| ⭐ Rack Weight + Floor Loading Calculator | Estimate loaded rack weight, per-rack design load, and average floor loading in psf and kPa. | Infrastructure & Systems Tools | Launch |
| ⭐ Server Rack Heat Density Calculator | Calculate watts per rack, BTU/hr, tons of cooling, rack heat density, airflow, and cooling headroom. | Infrastructure & Systems Tools | Launch |
| ⭐ Cabinet Airflow Calculator | Calculate cabinet CFM, temperature rise, containment leakage, fan derating, and airflow headroom. | Infrastructure & Systems Tools | Launch |
| ⭐ Cooling Load Estimator | Estimate cooling load in kW and BTU/hr from IT load, losses, lighting, and occupancy. | Infrastructure & Systems Tools | Launch |
| ⭐ Datacenter PUE Efficiency Calculator | Compute PUE from facility and IT power with efficiency bands and renewable note. | Infrastructure & Systems Tools | Launch |
| ⭐ Failover Readiness RTO/RPO Planner | Estimate RTO and RPO using recovery times, backup frequency, and replication mode. | Infrastructure & Systems Tools | Launch |
| ⭐ 3-Phase PDU / Phase Load Balance Calculator | Check per-phase utilization, current imbalance, neutral current estimate, and suggested balancing moves. | Infrastructure & Systems Tools | Launch |
| ⭐ PDU Breaker Load Calculator | Check 80% continuous-load capacity, breaker amps, watts, and A/B redundancy failover headroom. | Infrastructure & Systems Tools | Launch |
| ⭐ Redundant Power Feed Capacity Calculator | Plan A/B feed normal load, surviving-feed failover capacity, continuous target headroom, and recommended feed rating. | Infrastructure & Systems Tools | Launch |
| ⭐ SLA Uptime / Downtime / Error Budget Calculator | Calculate allowed downtime, actual availability, remaining error budget, and breach status for common SLA and SLO windows. | Infrastructure & Systems Tools | Launch |
| ⭐ Air Fryer Calculator | Convert oven time and temperature to air fryer settings with crispness adjustments. | Cooking & Kitchen Tools | Launch |
| ⭐ Oven Temperature Converter | Convert oven temperatures between Fahrenheit, Celsius, gas mark, and fan oven settings. | Cooking & Kitchen Tools | Launch |
| ⭐ Recipe Scaler | Scale ingredient amounts for new serving sizes with fraction-friendly outputs. | Cooking & Kitchen Tools | Launch |
| ⭐ Baker's Percentage Calculator | Calculate dough ingredient weights from flour percentage ratios. | Cooking & Kitchen Tools | Launch |
| ⭐ Meat Thaw Timer | Estimate refrigerator and cold-water thaw times by weight and meat type. | Cooking & Kitchen Tools | Launch |
| ⭐ Turkey Cooking Time Calculator | Plan turkey roasting time, serving capacity, oven start time, and safe temperature checks. | Cooking & Kitchen Tools | Launch |
| ⭐ Sous Vide Time and Temperature Calculator | Calculate conservative sous vide pasteurization time from food thickness and water-bath temperature. | Cooking & Kitchen Tools | Launch |
| ⭐ Cake Pan Converter | Compare pan volumes and scale batter amounts across shapes and sizes. | Cooking & Kitchen Tools | Launch |
| ⭐ Coffee Brew Ratio Calculator | Calculate coffee and water weights by brew method ratio. | Cooking & Kitchen Tools | Launch |
| ⭐ High Altitude Baking Adjuster | Adjust temperature, time, leavening, and liquids for elevation. | Cooking & Kitchen Tools | Launch |
| ⭐ Slow Cooker to Oven Converter | Convert slow cooker Low/High times to oven equivalents. | Cooking & Kitchen Tools | Launch |
| ⭐ Egg Boil Calculator | Time soft, jammy, or hard eggs based on size and starting temperature. | Cooking & Kitchen Tools | Launch |
| ⭐ Recipe Cost Calculator | Estimate total recipe cost and price per serving from ingredient prices. | Cooking & Kitchen Tools | Launch |
| ⭐ Cups to Grams Calculator | Convert cups, spoons, grams, ounces, and milliliters for common cooking ingredients. | Cooking & Kitchen Tools | Launch |
| ⭐ Rice to Water Ratio Calculator | Calculate water, timing, and cooked yield for common rice varieties. | Cooking & Kitchen Tools | Launch |
| ⭐ Brine Calculator | Calculate wet-brine salinity or dry-brine salt and sugar amounts by percentage. | Cooking & Kitchen Tools | Launch |
| ⭐ Nutrition Label Builder | Build a nutrition label from serving size and nutrient values with a printable, browser-based layout. | Cooking & Kitchen Tools | Launch |
| ⭐ NPK Fertilizer Mixing Calculator | Blend up to three fertilizer sources to hit a target N-P-K ratio with linear mix solving. | Agriculture & Gardening Tools | Launch |
| ⭐ Tank Mix Sprayer Calibration Calculator | Calibrate spray rate from tank size, nozzle flow, speed, and swath width. | Agriculture & Gardening Tools | Launch |
| ⭐ Plant Population & Seeding Rate Calculator | Convert spacing and germination into plant counts, seeds needed, and density. | Agriculture & Gardening Tools | Launch |
| ⭐ Compost C:N Ratio Calculator | Balance greens and browns with weighted carbon and nitrogen inputs. | Agriculture & Gardening Tools | Launch |
| ⭐ Grow Light Cost & PPFD Estimator | Estimate electricity costs and DLI from PPFD, wattage, and runtime. | Agriculture & Gardening Tools | Launch |
| ⭐ Raised Bed Volume Calculator | Compute raised bed soil volume with shape options and bag estimates. | Agriculture & Gardening Tools | Launch |
| ⭐ Irrigation Duty Cycle Calculator | Calculate weekly water volume and runtime from area, depth, and flow rate. | Agriculture & Gardening Tools | Launch |
| ⭐ Harvest Date & Sowing Planner | Plan harvest windows from sowing dates with frost risk warnings. | Agriculture & Gardening Tools | Launch |
| ⭐ Crop Break-Even Price and Profit Calculator | Estimate crop break-even price and yield, expected profit, operating-cost coverage, target price, and price-yield sensitivity. | Agriculture & Gardening Tools | Launch |
| ⭐ Crop Harvest Loss Calculator | Estimate crop harvest loss, recovery rate, lost yield and value, and the improvement available at a target loss rate. | Agriculture & Gardening Tools | Launch |
| ⭐ Crop Water Requirement & Evapotranspiration Calculator | Estimate FAO-56 reference ET, crop water use, effective-rainfall credit, irrigation depth, and field water volume. | Agriculture & Gardening Tools | Launch |
| ⭐ Farm Pond Volume and Irrigation Capacity Calculator | Calculate pond volume, usable water, irrigable acreage, field applications, and optional pump time in U.S. and metric units. | Agriculture & Gardening Tools | Launch |
| ⭐ Field Drainage Tile Spacing Calculator | Estimate preliminary spacing and lateral tile length for a parallel subsurface field drainage layout. | Agriculture & Gardening Tools | Launch |
| ⭐ Grain Bin Capacity Calculator | Estimate round-bin bushels, volume, and grain weight for level, peaked, inverted, or hopper-bottom storage. | Agriculture & Gardening Tools | Launch |
| ⭐ Grain Moisture Shrink and Drying Cost Calculator | Compare exact water shrink, physical handling loss, commercial pencil shrink, drying charges, and marketable dry grain. | Agriculture & Gardening Tools | Launch |
| ⭐ Greenhouse Heating Cost Calculator | Estimate greenhouse heat loss, required heater capacity, fuel use, and operating cost in U.S. or metric units. | Agriculture & Gardening Tools | Launch |
| ⭐ Orchard Tree Spacing and Tree Count Calculator | Estimate orchard density from row and in-row spacing or count whole planting positions in a rectangular block. | Agriculture & Gardening Tools | Launch |
| ⭐ Pasture Rotation & Paddock Size Planner | Plan rotational grazing from herd demand, available forage, grazing days, recovery days, and grazeable pasture area. | Agriculture & Gardening Tools | Launch |
| ⭐ Seed Germination & Seeding Rate Calculator | Turn germination or seed-tag percentages into a corrected seeding rate, PLS percentage, seed count, and total bulk seed weight. | Agriculture & Gardening Tools | Launch |
| ⭐ Silage Storage and Bunker Sizing Calculator | Size a bunker from herd demand or check an existing bunker's capacity and feedout rate. | Agriculture & Gardening Tools | Launch |
| ⭐ Soil Bulk Density and Porosity Calculator | Find dry bulk density and estimate total pore space from a known-volume sample or cylindrical soil core. | Agriculture & Gardening Tools | Launch |
| ⭐ Tractor Fuel Cost and Field Capacity Calculator | Estimate field capacity, tractor hours, fuel use, fuel cost per acre or hectare, and the working width needed to finish on time. | Agriculture & Gardening Tools | Launch |
| ⭐ Livestock Water Requirement Calculator | Plan daily livestock drinking water, system losses, reserve storage, refill flow, period volume, and water cost. | Agriculture & Gardening Tools | Launch |
| ⭐ Crop Rotation Planner & Planting Schedule Generator | Rotate crop families between beds and generate multi-year planting, succession, and harvest dates. | Agriculture & Gardening Tools | Launch |
| ⭐ Greenhouse Solar Angle Calculator | Optimize greenhouse roof pitch from latitude and seasonal goals. | Agriculture & Gardening Tools | Launch |
| ⭐ Livestock Feed Cost Calculator | Estimate feed needs, bag duration, and cost per animal per day. | Agriculture & Gardening Tools | Launch |
| ⭐ Fertilizer Application Rate Calculator | Convert nutrient targets into fertilizer product rate per acre, hectare, and 1,000 square feet. | Agriculture & Gardening Tools | Launch |
| ⭐ Lime Requirement Calculator | Estimate agricultural lime need from pH correction, soil texture, and ECCE. | Agriculture & Gardening Tools | Launch |
| ⭐ Herbicide / Pesticide Rate Calculator | Convert label rate into product per tank, per gallon, and total field requirement. | Agriculture & Gardening Tools | Launch |
| ⭐ Irrigation Depth / Run Time Calculator | Translate inches or millimeters of water into runtime and applied volume. | Agriculture & Gardening Tools | Launch |
| ⭐ Corn Yield Calculator | Estimate bushels per acre from ear counts, sample area, and kernels per ear. | Agriculture & Gardening Tools | Launch |
| ⭐ Hay Bale Weight / Feed Requirement Calculator | Estimate bale weight, feeding days, and total bales needed for livestock. | Agriculture & Gardening Tools | Launch |
| ⭐ Stocking Rate Calculator | Estimate acres per head, animal units, and pasture carrying capacity. | Agriculture & Gardening Tools | Launch |
| ⭐ Soil Texture Calculator | Classify soil texture from sand, silt, and clay percentages. | Agriculture & Gardening Tools | Launch |
| ⭐ Growing Degree Days Calculator | Track GDD heat units for crop staging and maturity planning. | Agriculture & Gardening Tools | Launch |
| ⭐ Manure Application Calculator | Convert nutrient targets into manure tons or gallons per acre. | Agriculture & Gardening Tools | Launch |
| ⭐ Carbon Footprint Calculator | Estimate a personal annual CO₂e footprint from home energy, travel, diet, and spending. Gentle defaults, fully editable factors. Private, client-side. | Environment Tools | Launch |
| ⭐ AQI to PM2.5 Converter | Convert U.S. AQI to PM2.5, calculate PM2.5 AQI category, and review EPA breakpoint ranges. Private, client-side. | Environment Tools | Launch |
| ⭐ Flight Emissions Calculator | CO₂ per passenger by distance, seat class, and legs — with passengers, round-trip option, aircraft presets, and RFI toggle for contrails. Private, client-side. | Environment Tools | Launch |
| 🌞 Solar Energy Calculator | Estimate daily kWh and savings from location, tilt, azimuth, and array size (area & efficiency or panels & wattage). Private, client-side. | Environment Tools | Launch |
| ⭐ Commute Emissions Comparison | Compare commute CO₂ across car, bike, bus, and train with editable factors (carpool size, fuel/kWh, grid intensity). Private, client-side. | Environment Tools | Launch |
| ⭐ Carbon Offset Estimator | Estimate trees or renewable kWh needed to offset CO₂. Editable tree growth, survival/buffer, and grid intensity. Private, client-side. | Environment Tools | Launch |
| ⭐ Home Energy Usage Calculator | Add appliances (or presets) to estimate annual kWh, cost, and CO₂. Includes standby, cycles, heat pump COP. Private, client-side. | Environment Tools | Launch |
| ⭐ Home Weatherization Savings Calculator | Estimate bill savings, CO2 reduction, net project cost, and payback from insulation, air sealing, weatherstripping, and draft fixes. Private, client-side. | Environment Tools | Launch |
| ⭐ Home Air Sealing Carbon Savings Calculator | Estimate annual and long-term operational CO2 savings from air sealing using HVAC electricity and fuels, audit savings, blower-door context, and editable factors. Private, client-side. | Environment Tools | Launch |
| ⭐ Electricity vs. Gas Heating | Compare heat pump, electric resistance, and gas boiler on efficiency, energy in, cost, and CO₂. Adjustable COP, prices, and carbon factors. Private, client-side. | Environment Tools | Launch |
| ⭐ Clothesline vs Dryer Energy Savings Calculator | Estimate kWh, therms, bill savings, CO2 reduction, dryer cycles avoided, and clothesline payback from line drying laundry. Private, client-side. | Environment Tools | Launch |
| ⭐ Heat Pump Water Heater Savings Calculator | Estimate bill savings, CO2 reduction, incentives, and payback when switching from electric or gas water heating to a heat pump water heater. Private, client-side. | Environment Tools | Launch |
| ⭐ EV vs. Gas Car CO₂ Calculator | Compare per-km and lifetime emissions, see break-even distance, and adjust grid/fuel/battery factors. Private, client-side. | Environment Tools | Launch |
| 🌍 Reusable Cup Impact Calculator | Estimate cups avoided and CO₂ saved per year from reusable cups vs single-use. Friendly, editable, client-side. | Environment Tools | Launch |
| ⭐ Reusable Bag Impact Calculator | Estimate plastic bags avoided, plastic waste avoided, and net CO2e saved from reusable shopping bags. Editable, private, client-side. | Environment Tools | Launch |
| 🌬️ Wind Turbine Output Calculator | Calculate turbine power from wind speed & blade size; estimate daily and annual energy. Editable Cp, efficiency, air density, and cut-in/out. Private, client-side. | Environment Tools | Launch |
| 🌊 Ocean Plastic Decomposition Timer | Visualize estimated fragmentation/decomposition times for common plastics across marine environments, with a simple time-lapse. Private, client-side. | Environment Tools | Launch |
| 🔋 Battery Storage Sizing Tool | Estimate needed battery storage for solar: usable & nameplate kWh, autonomy days, module count, and inverter/DC current checks. Private, client-side. | Environment Tools | Launch |
| ⭐ Reforestation Impact Estimator | Friendly estimator of reforestation CO₂ over time. Edit growth, survival, and buffer. Private, client-side. | Environment Tools | Launch |
| ⭐ Water Footprint Calculator | Estimate daily or annual water use across showers, laundry, taps/toilets, dishwasher, outdoor watering, and diet. Private, client-side. | Environment Tools | Launch |
| ⭐ Greywater Reuse Estimator | Estimate potential greywater capture and reuse to toilets/irrigation, with water, sewer, CO₂, and payback savings. Private, client-side. | Environment Tools | Launch |
| ⭐ Home Water Leak Waste & Cost Calculator | Estimate daily, monthly, annual, and custom-period water waste and variable utility cost from a drip count, flow rate, or container test. Private, client-side. | Environment Tools | Launch |
| ⭐ Pool Evaporation & Water Loss Calculator | Convert pool level loss to gallons and litres, estimate cover savings and refill cost, or compare pool and bucket-test loss. Private, client-side. | Environment Tools | Launch |
| ⭐ Low-Flow Toilet Water Savings Calculator | Compare old, WaterSense, and dual-flush toilets. Estimate annual water and bill savings, project cost, rebates, and simple payback. Private, client-side. | Environment Tools | Launch |
| ⭐ Faucet Aerator Water Savings Calculator | Compare current and lower-flow aerators. Estimate annual water and bill savings, project cost, rebates, and simple payback. Includes a container flow test. Private, client-side. | Environment Tools | Launch |
| ⭐ Food Carbon Footprint Calculator by Meal and Ingredient | Build a recipe from ingredient weights, estimate farm-to-retail CO2e per serving, rank contributors, and export the result. Private, client-side. | Environment Tools | Launch |
| ⭐ Plastic Footprint Calculator | Estimate bottles, bags, takeaway and packaging per year — pieces, mass, and optional CO₂e. Private, client-side. | Environment Tools | Launch |
| ⭐ Paper vs. Digital Impact Calculator | Estimate trees, water, and energy saved when documents move from paper to digital. Transparent, editable, client-side. | Environment Tools | Launch |
| ⭐ Shower Water & Energy Calculator | Estimate water use, heating energy (kWh), cost, and CO₂ from flow, time, and temperatures. Private, client-side. | Environment Tools | Launch |
| ⭐ Waste Reduction Impact | Estimate CO₂e saved by recycling vs. landfill/incineration. Fully editable factors; private, client-side. | Environment Tools | Launch |
| ⭐ E-Waste Recycling Impact Calculator | Estimate electronics reuse, recycling, landfill diversion, screening CO2e benefit, phone metals recovered, and laptop energy-equivalent savings. Private, client-side. | Environment Tools | Launch |
| ⭐ Food Waste Landfill Methane Calculator | Estimate CH4 and CO2e from food waste sent to landfill with editable IPCC-style factors, methane recovery, oxidation, and diversion targets. Private, client-side. | Environment Tools | Launch |
| ⭐ Composting Impact Calculator | Estimate CO2e saved by composting food scraps and yard waste instead of landfill disposal. Editable landfill, compost CH4, N2O, and GWP assumptions. Private, client-side. | Environment Tools | Launch |
| ⭐ Solar Payback Calculator | Estimate payback time, cash flow, NPV & IRR from cost, incentives, annual kWh, self-consumption, and tariffs. Private, client-side. | Environment Tools | Launch |
| ⭐ LED vs. Incandescent Savings | Annual kWh & cost savings from LEDs vs incandescents, with optional CO₂ and payback. Private, client-side. | Environment Tools | Launch |
| ⭐ Rainwater Harvesting Calculator | Estimate rooftop rain capture with annual/monthly rainfall, runoff & filter efficiency, first-flush, and optional tank capacity. Private, client-side. | Environment Tools | Launch |
| ⭐ Rain Garden Sizing Calculator | Size a residential rain garden from drainage area, design storm depth, runoff coefficient, ponding depth, infiltration rate, and safety factor. Private, client-side. | Environment Tools | Launch |
| ⭐ Native Plant Garden Water Savings Calculator | Estimate water and bill savings from replacing lawn or high-water beds with native, regionally appropriate plants. Establishment and mature-year views. Private, client-side. | Environment Tools | Launch |
| ⭐ Permeable Pavement Runoff Reduction Calculator | Estimate runoff avoided, overflow, storage use, drawdown time, and annualized stormwater reduction for porous asphalt, pervious concrete, or permeable pavers. Private, client-side. | Environment Tools | Launch |
| ⭐ Urban Heat Reduction Calculator | Estimate near-surface air cooling from canopy, shade, green roofs, and cool surfaces. Transparent, editable assumptions. Private, client-side. | Environment Tools | Launch |
| ⭐ Tree Shade Cooling Savings Calculator | Estimate AC kWh savings, cooling bill savings, CO2 reduction, and payback from shade trees around a home or small building. Private, client-side. | Environment Tools | Launch |
| ⭐ Sound Travel Time Calculator | Thunder delay & shout echo calculator with temperature-aware speed of sound. Distance ⇄ time, echo mode. Private, client-side. | Science & Engineering | Launch |
| ⭐ Light Travel Distance | How far does light go while you blink? Enter microseconds or milliseconds to see distances in meters, km, miles, Earth–Moon fraction, AU fraction, and times around Earth. | Science & Engineering | Launch |
| ⭐ How Many Helium Balloons to Lift You? | Estimate how many helium balloons could pretend-lift a chosen weight. Includes 9″/12″/24″ presets, custom size, kg/lb, and practical margin. Private, client-side. | Fun Calculators | Launch |
| ⭐ How Many Earths Fit in the Sun? | Compare any planet to any other by volume. Shows ideal vs sphere-packing counts and a friendly visual. Private, client-side. | Fun Calculators | Launch |
| ⭐ Cloud Storage in Floppy Disks Converter | Convert modern sizes into counts of retro media (floppies, CDs, DVDs, Blu-ray, Zip/Jaz, VHS). Decimal/binary units, VHS bitrate/length, private & client-side. | Fun Calculators | Launch |
| 🧠 How Many Tabs Can Your Brain Handle? | Estimate comfy vs. stretch tab counts from working-memory capacity, task complexity, and distractions. Private, client-side. | Calculators | Launch |
| ☕😴 Coffee-to-Sleep Tradeoff | Estimate bedtime delay and sleep loss from caffeine timing and dose with a simple half-life model. Private, client-side. | Health & Fitness Calculators | Launch |
| ⌨️ Keyboard Typing Distance | Turn word counts into meters and kilometers of finger travel, with configurable typing assumptions. Private, client-side. | Fun Calculators | Launch |
| 🧻 Toilet Paper Roll Length Converter | Turn toilet paper rolls into meters, kilometers, and fun comparisons (Eiffel Towers, football pitches, blue whales). Private, client-side. | Fun Calculators | Launch |
| 🐌 Snail Mail Speed Calculator | Compare a snail’s travel time (speed & duty cycle) with postal delivery times. Private, client-side. | Fun Calculators | Launch |
| 🪐 How Much Would You Weigh on Every Planet? | Enter Earth weight (kg/lb/N) or mass (kg) and see your weight across the Solar System using real planetary gravity constants. Private, client-side. | Fun Calculators | Launch |
| 📄 Data → Paper: How Many Pages? | Convert a text file size into printed pages with encoding & layout presets. Outputs pages, sheets, reams, paper weight, and stack height. Private, client-side. | Fun Calculators | Launch |
| 🔊 How Loud Is Too Loud? | dB ↔ intensity, pressure, source acoustic power from distance/directivity, and energy over time. Private, client-side. | Fun Calculators | Launch |
| ⭐ Love Calculator | Check playful name chemistry and an optional birthday rhythm boost. Private, client-side. | Games | Launch |
| 🐶 Dog Years to Human Years (Breed-Aware) | Breed/size-aware converter with Classic + DNA curves, months input, and a friendly visual. Private, client-side. | Fun Calculators | Launch |
| 😴 Perfect Nap Length Calculator | Sleep cycle optimizer: power naps (10–20 min) or full cycles (~90–110 min), start/wake planning, latency & chronotype tweaks. Private, client-side. | Fun Calculators | Launch |
| ⭐ Cells You’ve Replaced — “Every 7 Years” Myth Calculator | Explore tissue-by-tissue turnover with plain-English sources. Kid-friendly, private, 100% client-side. | Science & Engineering | Launch |
| ⭐ Email Carbon Footprint | Estimate the CO₂ footprint of emails and attachments with simple & advanced modes and friendly comparisons. Private, client-side. | Fun Calculators | Launch |
| ⭐ HTML to PDF Converter | Paste HTML or open an HTML file, review a script-free preview, and save it as a searchable PDF in your browser. | PDF & Documents | Launch |
| ⭐ PDF Metadata Remover | Inspect and remove PDF document properties and XMP metadata without uploading your file. | PDF & Documents | Launch |
| ⭐ Sign PDF Online | Draw, type, or upload a signature and place it on PDF pages without uploading the document. | PDF & Documents | Launch |
| ⭐ Split PDF Online | Extract all or selected PDF pages into individual PDF files locally in your browser. | PDF & Documents | Launch |
| ⭐ Unlock PDF Online | Use the correct PDF password to create an unlocked copy locally in your browser. | PDF & Documents | Launch |
| ⭐ Word to PDF Converter | Open a DOCX locally, review its pages, and save a searchable PDF without uploading the document. | PDF & Documents | Launch |
| ⭐ Age on Other Planets Calculator | Compare your age across the solar system and find your next birthday on every world. | Fun Calculators | Launch |
| ⭐ Footsteps Around the World Calculator | Turn your step length into a round-the-world step count, walking days, and years. | Fun Calculators | Launch |
| ⭐ Human Battery Calculator | Turn daily metabolic energy into average watts, kilowatt-hours, and playful battery equivalents. | Fun Calculators | Launch |
| ⭐ LEGO Brick Tower Calculator | Calculate the LEGO bricks, plates, or custom courses needed to reach a target height. | Fun Calculators | Launch |
| ⭐ Popcorn Expansion Calculator | See how much popcorn your kernels can make, from snack bowls to cinema buckets. | Fun Calculators | Launch |
| ⭐ CDN Cache Hit Ratio Calculator | Estimate origin bandwidth and egress savings at current and target CDN cache hit ratios. | Infrastructure & Systems Tools | Launch |
| ⭐ Cloud Egress Cost Calculator | Estimate tiered data-transfer charges, monthly fees, and average bandwidth from cloud egress. | Infrastructure & Systems Tools | Launch |
| ⭐ Data Center White Space Capacity Planner | Find the rack ceiling imposed by floor area, facility power, and sensible cooling. | Infrastructure & Systems Tools | Launch |
| ⭐ Database Connection Pool Size Calculator | Estimate pooled connections per application instance from concurrency, latency, throughput, headroom, and database limits. | Infrastructure & Systems Tools | Launch |
| ⭐ Ethernet Cable Distance & Speed Checker | Screen Cat5e, Cat6, and Cat6A channel length for Ethernet speeds through 10 Gb/s. | Infrastructure & Systems Tools | Launch |
| ⭐ Infrastructure Availability Calculator | Model series, parallel, and k-of-n redundant infrastructure and estimate availability and downtime. | Infrastructure & Systems Tools | Launch |
| ⭐ IPsec VPN Throughput Calculator | Estimate tunnel overhead, safe MTU, encryption capacity, WAN utilization, and throughput per tunnel. | Infrastructure & Systems Tools | Launch |
| ⭐ Kubernetes Cluster Capacity Planner | Plan worker nodes from workload requests, pod slots, allocatable resources, growth, headroom, and failure reserve. | Infrastructure & Systems Tools | Launch |
| ⭐ Log Storage Calculator | Estimate retained log capacity from ingest rate, retention, compression, copies, overhead, and headroom. | Infrastructure & Systems Tools | Launch |
| ⭐ Object Storage Cost Calculator | Estimate object storage, request, retrieval, and billable egress charges with provider-neutral rates. | Infrastructure & Systems Tools | Launch |
| ⭐ Structured Cabling Length Estimator | Plan cable runs, service loops, routing allowance, waste, and box or reel quantities. | Infrastructure & Systems Tools | Launch |
| ⭐ TCP Throughput Calculator | Estimate window-limited and loss-limited TCP throughput from window size, RTT, packet loss, MSS, and bottleneck rate. | Infrastructure & Systems Tools | Launch |
| ⭐ Audio Latency Calculator | Calculate input, output, and estimated round-trip audio delay from buffer size, sample rate, and known interface overhead. | Studio Tools | Launch |
| ⭐ Audio Crossover Calculator | Design an ideal passive 2-way crossover and find exact and preferred capacitor and inductor values. | Studio Tools | Launch |
| ⭐ Color Temperature Converter | Convert Kelvin and mired values and compare common CTO and CTB gel corrections. | Studio Tools | Launch |
| ⭐ Exposure Value Calculator | Calculate EV100 or solve for aperture, shutter speed, or ISO with equivalent exposure settings. | Studio Tools | Launch |
| ⭐ Frame Rate Conversion Calculator | Compare conform and duration-preserving frame-rate conversions with exact NTSC fractional rates. | Studio Tools | Launch |
| ⭐ Green Screen Size Calculator | Plan subject framing, camera distance, and chroma screen coverage for a camera and lens setup. | Studio Tools | Launch |
| ⭐ Lens Diffraction Calculator | Compare a lens's theoretical Airy disk and diffraction cutoff with camera pixel pitch and sensor sampling. | Studio Tools | Launch |
| ⭐ Lighting Inverse Square Law Calculator | Calculate lux at another distance or find the distance for a target lux value and exposure-stop change. | Studio Tools | Launch |
| ⭐ LUFS Loudness Normalization Calculator | Estimate loudness gain, true-peak headroom, and peak-safe playback across common streaming references. | Studio Tools | Launch |
| ⭐ Macro Magnification Calculator | Estimate macro magnification, framing, working distance, target extension, and effective aperture. | Studio Tools | Launch |
| ⭐ MIDI Note to Frequency Calculator | Convert MIDI numbers, musical note names, and frequencies with adjustable tuning and cents readouts. | Studio Tools | Launch |
| ⭐ Pixel Pitch Calculator | Convert sensor dimensions and resolution into pixel pitch, megapixels, pixel area, and physical pixel density. | Studio Tools | Launch |
| ⭐ Room Mode Calculator | Find axial room modes and close-frequency overlaps for a rectangular listening room. | Studio Tools | Launch |
| ⭐ Sound Pressure Level Distance Calculator | Estimate SPL at another distance or from speaker sensitivity, amplifier power, and listening distance. | Studio Tools | Launch |
| ⭐ Studio Monitor Time Alignment Calculator | Turn monitor path-length differences into delay time, sample offset, and phase separation. | Studio Tools | Launch |
| ⭐ Teleprompter Reading Time Calculator | Estimate spoken reading time, total video duration, target word budget, and words to cut. | Studio Tools | Launch |
| ⭐ Timecode Calculator | Calculate with SMPTE timecode and convert exact frame counts at common whole and fractional frame rates. | Studio Tools | Launch |
| ⭐ Decimal Degrees to DMS Converter | Convert decimal degrees to degrees, minutes, and seconds with hemisphere and rounding controls. | Calculators | Launch |
| ⭐ International Shoe & Clothing Size Converter | Convert adult shoe and clothing sizes between US, UK, EU, Japan, and international labels. | Calculators | Launch |
| ⭐ VO2 Max Estimator | Estimate aerobic capacity from Cooper, Rockport, or heart-rate-ratio methods. | Health & Fitness Calculators | Launch |
| ⭐ Cooking Oil Smoke Point Finder | Compare common cooking-oil smoke points with frying temperatures in Fahrenheit or Celsius. | Cooking & Kitchen Tools | Launch |
| ⭐ Pressure Cooker Time Converter | Convert pressure-cooker time to stovetop, covered-oven, and slow-cooker starting ranges. | Cooking & Kitchen Tools | Launch |
| ⭐ Microwave Cooking Time Converter | Adjust recipe or package cooking time for a microwave with a different output wattage. | Cooking & Kitchen Tools | Launch |
| ⭐ Sourdough Starter Feeding Calculator | Calculate starter feeding ratios, hydration, ingredient weights, and timing. | Cooking & Kitchen Tools | Launch |
| ⭐ Chocolate Tempering Calculator | Calculate seed amounts and temperature stages for dark, milk, or white chocolate. | Cooking & Kitchen Tools | Launch |
| ⭐ Yeast Conversion Calculator | Convert active dry, instant, and fresh yeast by weight, volume, or packets. | Cooking & Kitchen Tools | Launch |
| ⭐ Marinade Calculator | Calculate marinade amount and a practical marinating-time range from meat type and weight. | Cooking & Kitchen Tools | Launch |
| ⭐ BBQ Meat Calculator | Plan meat portions, raw shopping weight, cooked yield, cooking time, and start time. | Cooking & Kitchen Tools | Launch |
| ⭐ Party Food Calculator | Plan portions and quantities for party food, drinks, desserts, snacks, and ice. | Cooking & Kitchen Tools | Launch |
| ⭐ Pasta Serving Calculator | Calculate dry pasta portions, cooking water, pot size, and estimated cooked yield. | Cooking & Kitchen Tools | Launch |
| ⭐ Egg Size Conversion Calculator | Convert egg sizes into equivalent counts, cracked weight, tablespoons, and recipe measures. | Cooking & Kitchen Tools | Launch |
| ⭐ Fermentation Salt Calculator | Calculate fermentation salt by water-only or total-batch weight and check brine percentage. | Cooking & Kitchen Tools | Launch |
| ⭐ Jam and Jelly Pectin Calculator | Scale fruit, sugar, and pectin and plan separate tested-recipe batch sizes. | Cooking & Kitchen Tools | Launch |
| ⭐ Similar Triangles Calculator | Find scale factors, corresponding sides, area ratios, and matching areas with steps. | Geometry | Launch |
| ⭐ Equation of a Circle Calculator | Find standard and general circle equations from a center, radius, point, or three points. | Geometry | Launch |
| ⭐ Circle Sector Calculator | Solve sector area, arc length, radius, angle, chord, and perimeter from two values. | Geometry | Launch |
| ⭐ Circle Chord Calculator | Calculate chord length, sagitta, central angle, arc length, and segment area. | Geometry | Launch |
| ⭐ Annulus Calculator | Calculate ring area, inner and outer radii, width, diameters, and circumferences. | Geometry | Launch |
| ⭐ Rhombus Calculator | Calculate area, perimeter, side, diagonals, angles, height, and inradius. | Geometry | Launch |
| ⭐ Rectangular Prism Calculator | Calculate volume, surface area, space diagonal, face diagonals, and edge length. | Geometry | Launch |
| ⭐ Triangular Prism Calculator | Calculate volume, surface area, or prism length from the three triangular base sides. | Geometry | Launch |
| ⭐ Conical Frustum Calculator | Calculate volume, surface area, slant height, base areas, and diameters. | Geometry | Launch |
| ⭐ Torus Calculator | Calculate torus volume, surface area, major and minor radii, and inner or outer diameters. | Geometry | Launch |
| ⭐ Tetrahedron Calculator | Calculate a regular tetrahedron's volume, surface area, height, edge length, and radii. | Geometry | Launch |
| ⭐ Perpendicular Bisector Calculator | Find the midpoint, exact perpendicular-bisector equation, slope, graph, and steps. | Geometry | Launch |
| ⭐ Parallel & Perpendicular Line Calculator | Find parallel and perpendicular line equations through a point with exact steps and a graph. | Geometry | Launch |
| ⭐ Geometric Transformation Matrix Calculator | Compose translate, rotate, scale, and reflect operations into one 3×3 matrix. | Geometry | Launch |
| ⭐ LU Decomposition Calculator | Factor square matrices with partial pivoting and step-by-step P, L, and U matrices. | Linear Algebra | Launch |
| ⭐ Cholesky Decomposition Calculator | Factor symmetric positive-definite matrices into L and Lᵀ with entry-by-entry steps and reconstruction checks. | Linear Algebra | Launch |
| ⭐ Gram–Schmidt Orthonormalization Calculator | Orthonormalize vectors with modified Gram–Schmidt and inspect Q, R, projections, and numerical accuracy. | Linear Algebra | Launch |
| ⭐ Matrix Condition Number Calculator | Measure matrix sensitivity in the 2, 1, infinity, or Frobenius norm with rank and singular-value diagnostics. | Linear Algebra | Launch |
| ⭐ Matrix Calculator — Add, Multiply and Transpose | Add, multiply, or transpose matrices up to 8×8 with dimension checks and working steps. | Linear Algebra | Launch |
| ⭐ Inverse Matrix Calculator with Gauss–Jordan Steps | Invert 2×2 to 6×6 matrices with scaled pivoting, complete row-operation steps, and a numerical verification. | Linear Algebra | Launch |
| ⭐ Change of Basis Matrix Calculator | Convert coordinates between two ordered bases, calculate both change matrices, and verify an optional vector. | Linear Algebra | Launch |
| ⭐ System of Linear Equations Solver using Gaussian Elimination | Solve 2–8 equations and variables with scaled pivoting, solution classification, and complete Gaussian-elimination steps. | Linear Algebra | Launch |
| ⭐ Least Squares Regression Matrix Calculator | Fit y ≈ Xβ with an SVD pseudoinverse, coefficients, residuals, R², RMSE, rank diagnostics, and matrix steps. | Linear Algebra | Launch |
| ⭐ Integer Partition Calculator and Partition Generator | Calculate p(n) or generate every non-increasing integer partition with nearby values and downloadable results. | Number Theory | Launch |
| ⭐ Sum of Two Squares Calculator and Representation Finder | Test whether an integer is a sum of two squares and find every unique representation with exact verification. | Number Theory | Launch |
| ⭐ Highly Composite Number and Divisor Record Finder | Find highly composite numbers, record divisor counts, prime factorizations, and exact tau values. | Number Theory | Launch |
| ⭐ Pell Equation Solver for Integer Solutions | Solve x² − Dy² = 1 with continued fractions, the fundamental solution, and exact verification. | Number Theory | Launch |
| ⭐ Quadratic Residue and Legendre Symbol Calculator | Calculate Legendre symbols, test quadratic residues, and find modular square roots with exact steps. | Number Theory | Launch |
| ⭐ Möbius Function and Mertens Function Calculator | Calculate μ(n) and M(n) with prime factorization, square-free classification, and summatory counts. | Number Theory | Launch |
| ⭐ Perfect, Abundant and Deficient Number Checker | Classify an integer from its proper divisors, exact divisor sum, and prime factorization. | Number Theory | Launch |
| ⭐ Continued Fraction Calculator and Rational Approximation Tool | Expand values as continued fractions, list convergents, and find bounded-denominator approximations. | Number Theory | Launch |
| ⭐ Linear Diophantine Equation Solver with Integer Solutions | Solve ax + by = c over the integers and return one solution plus the full parameterized family. | Number Theory | Launch |
| ⭐ Divisibility Test Calculator with Rules and Steps | Check divisibility with the exact quotient, remainder, applicable shortcut rule, and worked steps. | Number Theory | Launch |
| ⭐ Coprime Number Checker and Pairwise Coprime Calculator | Check pairwise and collective coprimality with exact GCDs and conflicting-pair details. | Number Theory | Launch |
| ⭐ Extended Euclidean Algorithm Calculator | Find the GCD and Bézout coefficients with exact Euclidean divisions and identity verification. | Number Theory | Launch |
| ⭐ Euler’s Totient Function Calculator with Steps | Calculate φ(n) from prime factorization with Euler’s product formula and exact substitution steps. | Number Theory | Launch |
| ⭐ Divisor Count and Sum of Divisors Calculator | Calculate τ(n), σ(n), proper-divisor sums, classifications, and complete divisor lists. | Number Theory | Launch |
| ⭐ Prime Number Generator & Sieve Calculator | Generate primes in a range with an interactive Sieve of Eratosthenes and downloadable results. | Number Theory | Launch |
| ⭐ Drag Racing ET and Trap Speed Calculator | Estimate quarter-mile elapsed time and trap speed from peak engine horsepower and total race-ready weight. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Horsepower to Torque Calculator | Calculate torque, horsepower, or RPM and convert between hp, kW, PS, lb-ft, N·m, and lb-in. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Vehicle Power-to-Weight Ratio Calculator | Calculate hp/ton, hp/1,000 lb, W/kg, lb/hp, and an ideal energy-limited acceleration reference. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Suspension Spring Rate Calculator | Calculate spring rate, wheel rate, ride frequency, corner sprung weight, and static deflection from vehicle weight and motion ratio. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Carburetor CFM Calculator | Calculate theoretical four-stroke engine airflow from displacement, RPM, and volumetric efficiency. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Octane Mixing Calculator | Calculate two-fuel amounts for a target octane, an addition to existing fuel, or a known blend's estimated octane. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Engine Coolant Mixture Calculator | Calculate fresh-fill antifreeze and water amounts, drain-and-refill corrections, concentration, and illustrative freeze protection. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Automotive Paint Quantity Calculator | Estimate coating, activator, reducer, and ready-to-spray material from editable panels, coats, coverage, mix ratio, and spray allowance. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Engine Displacement Calculator | Calculate total and per-cylinder engine displacement from bore, stroke, and cylinder count in metric or imperial units. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Engine Piston Speed Calculator | Calculate mean piston speed from stroke and RPM in metric and imperial speed units. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Gear Ratio and RPM Calculator | Calculate theoretical engine RPM, road speed, transmission ratio, or final-drive ratio from tire size and driveline inputs. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Speedometer Calibration Calculator | Estimate actual speed, speedometer error, and recalibration factors after tire-size or axle-ratio changes. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Vehicle Stopping Distance Calculator | Estimate reaction distance, braking distance, total stopping distance, and stopping time from speed, reaction time, braking, and road grade. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Vehicle Payload Calculator | Calculate payload used, remaining capacity, and estimated loaded weight from GVWR or a door-label payload limit. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Towing Capacity Calculator | Check loaded trailer and tongue weight against vehicle towing capacity, payload, GCWR, hitch limits, and trailer GVWR. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Vehicle Maintenance Schedule Generator | Turn vehicle-specific mileage and calendar intervals into a prioritized plan of overdue, due-soon, and upcoming service. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Oil Change Interval Calculator | Calculate the next oil-change mileage and date from normal or severe-service intervals, with due status and an optional usage projection. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Brake Pad Life Estimator | Estimate a broad brake-pad mileage and date window from a reference life, distance driven, annual mileage, and driving conditions. v1.0 | Automotive & Vehicles | Launch |
| ⭐ EV Charging Time Calculator | Estimate charging time, energy drawn, range added, and range per hour from battery size, charge level, charger power, losses, and consumption. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Car Battery Reserve Capacity Calculator | Estimate accessory runtime from battery RC and electrical load, or find allowable amps and watts for a target runtime. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Parasitic Battery Drain Calculator | Estimate discharge time from measured key-off current, or infer average parasitic draw from battery capacity and elapsed time. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Alternator Size Calculator | Total vehicle and accessory current, then estimate alternator amperage with reserve and hot or idle output assumptions. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Electric Vehicle Range Calculator | Estimate weather-adjusted EV range, usable battery energy, trip margin, and arrival charge from transparent planning assumptions. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Car Depreciation Calculator | Estimate future vehicle value, retained value, and annual depreciation with a year-by-year schedule. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Tire Pressure Calculator | Predict pressure changes with temperature and screen a cold PSI adjustment for a changed per-tire load. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Wheel Offset Calculator | Compare wheel width, offset, spacers, inner clearance, outer poke, track width, and approximate backspacing. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Gas Mileage Calculator | Calculate actual US MPG, imperial MPG, L/100 km, km/L, fuel cost, and driving cost per mile. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Road Trip Fuel Stop Planner | Plan maximum fuel legs and the minimum number of stops from trip distance, tank size, fuel economy, starting fuel, and reserve. v1.0 | Automotive & Vehicles | Launch |
| ⭐ Boat Loan Payoff and Ownership Cost Calculator | Project payoff timing and extra-payment savings, then total insurance, storage, maintenance, fuel, taxes, and multi-year cash outlay. | Marine & Boating | Launch |
| ⭐ Boat Engine Horsepower and Power-to-Weight Calculator | Total one or more engines, convert hp, kW and PS, and calculate loaded boat power-to-weight and weight-per-power ratios. | Marine & Boating | Launch |
| ⭐ Boat Trailer Weight and Towing Capacity Calculator | Total the boat, trailer, fuel and gear; estimate tongue weight and compare vehicle, payload, GCWR, hitch and trailer limits. | Marine & Boating | Launch |
| ⭐ Bilge Pump Capacity Calculator | Estimate bilge inflow, delivered-flow demand, and required pump label capacity with clearing-time, reserve, and installed-output assumptions. | Marine & Boating | Launch |
| ⭐ Boat Displacement and Load Capacity Calculator | Total people, motor, fluids, and gear; compare the relevant load with a published limit and estimate displaced-water volume. | Marine & Boating | Launch |
| ⭐ Boat Draft and Under-Keel Clearance Calculator | Estimate raw and adjusted keel clearance after tide, squat, motion, depth uncertainty, and a selected minimum. | Marine & Boating | Launch |
| ⭐ Tide Height and Safe Passage Window Calculator | Estimate tide height, required water level, threshold crossings, and continuous passage windows from three consecutive tide events. | Marine & Boating | Launch |
| ⭐ Anchor Rode Length Calculator | Calculate total rode from depth, tide, bow height, and scope, then split the result into chain and rope. | Marine & Boating | Launch |
| ⭐ Dock Line Length and Diameter Calculator | Estimate transient bow, stern, and spring line lengths, total rope, and a starting diameter from boat length. | Marine & Boating | Launch |
| ⭐ Marina Berth Size and Clearance Calculator | Calculate a minimum berth envelope and check usable length, width, water depth, and optional overhead clearance. | Marine & Boating | Launch |
| ⭐ Hull Speed Calculator for Displacement Boats | Estimate hull speed from waterline length and compare knots, mph, km/h, speed-length ratio, and Froude number. | Marine & Boating | Launch |
| ⭐ Boat Planing Speed and Froude Number Calculator | Calculate length Froude number and the speed at a selected transition or planing comparison value from loaded waterline length. | Marine & Boating | Launch |
| ⭐ Marine Navigation Distance and Bearing Calculator | Compare spherical great-circle and rhumb-line distance, initial and final true bearings, and constant course between two coordinates. | Marine & Boating | Launch |
| ⭐ Sailing Distance, Speed and Passage Time Calculator | Calculate passage duration, sailing distance, or required average speed, with marine unit conversions and optional local arrival time. | Marine & Boating | Launch |
| ⭐ Apparent Wind Calculator | Calculate apparent wind speed, angle, side, and vector components from true wind, boat speed through water, and true wind angle. | Marine & Boating | Launch |
| ⭐ Boat Propeller Pitch and Slip Calculator | Calculate propeller slip, theoretical or actual speed, required pitch, engine RPM, or drive ratio. | Marine & Boating | Launch |
| ⭐ Boat Fuel Consumption Calculator | Calculate GPH or L/h, trip fuel, reserve fuel, cost, endurance, and cruising range. v1.0 | Marine & Boating | Launch |
| ⭐ Boat Range and Reserve Fuel Calculator | Estimate reserve-adjusted range, endurance, out-and-back distance, and planned-trip fuel margin. | Marine & Boating | Launch |
| ⭐ Boat Battery Bank and Runtime Calculator | Calculate series-parallel bank size, usable energy, steady-load runtime, and capacity required for a target runtime. | Marine & Boating | Launch |
| ⭐ Boat Freshwater Tank Duration Calculator | Estimate freshwater endurance, protect a reserve, and check the current supply against crew use and planned trip duration. | Marine & Boating | Launch |
| ⭐ Marine Holding Tank Capacity and Pump-Out Planner | Estimate holding-tank capacity, daily inflow, time to a fill limit, trip margin, and pump-out volume or time. | Marine & Boating | Launch |
| ⭐ Marine Fuel Tank Capacity Calculator | Estimate rectangular, round, or elliptical tank capacity, current contents, ullage, and usable fuel. | Marine & Boating | Launch |
| ⭐ CSS Border Radius Generator | Create CSS border-radius values visually, set each corner, build elliptical radii, preview the result, and copy clean CSS. | Web Development | Launch |
| ⭐ CSS Box Shadow Generator | Build single or layered CSS box shadows with visual controls, presets, inset effects, a live preview, and copy-ready CSS. | Web Development | Launch |
| ⭐ CSS Clamp Calculator | Generate a CSS clamp() font size from minimum and maximum type sizes and viewport widths, then preview and copy the result. | Web Development | Launch |
| ⭐ CSS Minifier & Beautifier | Format, beautify, validate, or minify CSS privately in your browser, compare size savings, and copy or download the result. | Web Development | Launch |
| ⭐ .htaccess Redirect Generator & Tester | Build, validate, test, copy, and download exact, prefix, and regular-expression Apache redirect rules. | Web Development | Launch |
| ⭐ HTTP Status Code Checker & Reference | Check browser-visible HTTP responses and search registered status codes by number or plain-English meaning. | Web Development | Launch |
| ⭐ JSON Schema Validator | Validate JSON data against modern JSON Schema drafts with clear instance paths and private browser processing. | Web Development | Launch |
| ⭐ XML Formatter, Validator & Minifier | Format, validate, and minify XML with clear parsing errors, mixed-content handling, copy, and download. | Web Development | Launch |
| ⭐ Acoustic Treatment Calculator | Plan acoustic panel coverage, stacked corner bass traps, and first-reflection points for a rectangular studio. Includes metric and imperial units, diagram, copy, and CSV. | Studio Tools | Launch |
| ⭐ Anamorphic Desqueeze Calculator | Calculate anamorphic desqueezed aspect ratio, square-pixel resolution, delivery crop, pixels trimmed, and image area retained for 1.33x to 2x lenses. | Studio Tools | Launch |
| ⭐ Audio Bit Depth Calculator | Calculate audio quantization levels, ideal sine-wave dynamic range, one-LSB range, quantization noise floor, and signal SQNR for any integer bit depth. | Studio Tools | Launch |
| ⭐ Bellows Exposure Compensation Calculator | Calculate bellows extension factor, added exposure stops, effective aperture, corrected shutter time, aperture, and ISO from focal length and total bellows draw. | Studio Tools | Launch |
| ⭐ Camera Battery Runtime Calculator | Estimate camera battery runtime from watt-hours or mAh, voltage, rig power draw, usable capacity, and battery count. Check target recording time and batteries needed. | Studio Tools | Launch |
| ⭐ Camera Flash Guide Number Calculator | Calculate camera-flash aperture, maximum distance, or ISO from a guide number. Supports GN in metres or feet, clear formulas, and practical flash limits. | Studio Tools | Launch |
| ⭐ DMX Address Calculator | Calculate sequential DMX start addresses from fixture channel modes and quantities. Plan universe rollover, address ranges, gaps, and export a fixture patch list. | Studio Tools | Launch |
| ⭐ Filter Step-Up Ring Finder | Find the exact step-up or step-down ring for a camera lens and screw-in filter. Enter both thread diameters to get the correct adapter marking and fit notes. | Studio Tools | Launch |
| ⭐ Flash Duration Motion Freeze Calculator | Calculate motion blur distance from flash duration, subject speed, and movement angle—or find the speed limit or t0.1 duration needed for a blur target. | Studio Tools | Launch |
| ⭐ Podcast File Size Calculator | Calculate podcast file size from episode duration and bitrate. Estimate one episode, a full library, monthly uploads, annual storage, and episodes per storage budget. | Studio Tools | Launch |
| ⭐ Professional Audio Level Converter | Convert professional audio levels between dBu, dBV, volts RMS, millivolts, and calibrated dBFS. Includes sine-wave peak voltage, copy, and CSV export. | Studio Tools | Launch |
| ⭐ Speaker Impedance Calculator | Calculate total speaker impedance for series, parallel, and mixed series-parallel wiring. Check amplifier load, branch current, and ideal power sharing. | Studio Tools | Launch |
| ⭐ Studio Lighting Ratio Calculator | Calculate studio key-to-fill ratio, combined lighting ratio, and highlight-to-shadow contrast in stops from lux, foot-candle, or relative light readings. | Studio Tools | Launch |
| ⭐ Video Speed Ramp Calculator | Calculate speed-ramp playback duration, effective speed, source and timeline frames, frame rounding, and linear or eased ramp curves. | Studio Tools | Launch |
| ⭐ Voice-Over Length Calculator | Calculate voice-over length from a script or word count and WPM. Estimate raw recording and studio session time using takes, pickups, and setup time. | Studio Tools | Launch |
| ⭐ Brake Bias Calculator – Front and Rear Braking Force | Calculate front and rear brake bias, split total axle braking force, or estimate a level-road load-transfer reference with metric and imperial units. | Automotive & Vehicles | Launch |
| ⭐ Engine Compression Ratio Calculator – Bore, Stroke, Chamber and Gasket Volume | Calculate static engine compression ratio from bore, stroke, chamber, gasket, piston, and deck-clearance measurements in metric or imperial units. | Automotive & Vehicles | Launch |
| ⭐ Exhaust Pipe Size Calculator – Horsepower, Engine Size and Pipe Diameter | Estimate single or dual exhaust pipe diameter from horsepower, then compare pipe area, engine displacement, power density, and peak-power BMEP. | Automotive & Vehicles | Launch |
| ⭐ Fuel Injector Size Calculator – Horsepower, BSFC and Duty Cycle | Calculate fuel injector size, supported horsepower, or injector duty cycle from engine power, BSFC, injector count, and fuel density. Converts lb/hr and cc/min. | Automotive & Vehicles | Launch |
| ⭐ Turbo Boost and Horsepower Calculator – Pressure Ratio and Power Gain | Calculate turbo pressure ratio, ideal horsepower, estimated power gain, and boosted horsepower from baseline power, gauge boost, ambient pressure, and a realization factor. | Automotive & Vehicles | Launch |
| ⭐ Electricity Grid Carbon Intensity Calculator | Calculate electricity emissions from energy use or average load, or derive grid carbon intensity from total emissions and generation. Supports g/kWh, kg/MWh, and lb/MWh. | Environment Tools | Launch |
| ⭐ Vampire Power Cost Calculator | Calculate standby vampire power in watts, kWh, annual electricity cost, avoidable savings, and CO2 for TVs, consoles, chargers, and other home devices. | Environment Tools | Launch |
| ⭐ Household Appliance Carbon Emissions Calculator | Estimate annual electricity use and CO2 emissions for refrigerators, washers, TVs, computers, kitchen appliances, and other household devices. | Environment Tools | Launch |
| ⭐ Household Waste Audit & Diversion Planner | Audit household rubbish, recycling, compost and reuse by weight. Calculate diversion, annual waste, per-person generation, target gaps and a practical category plan. | Environment Tools | Launch |
| ⭐ Lawn Fertilizer Runoff Risk Calculator | Screen lawn fertilizer runoff risk from application rate, rain timing, soil condition, slope, turf cover, pavement cleanup, buffers, and distance to water. | Environment Tools | Launch |
| ⭐ Pollinator Garden Size and Plant Planner | Plan a pollinator garden bed, estimate plant capacity or required area, and balance plant groups across spring, summer, and fall bloom. Free and private. | Environment Tools | Launch |
| ⭐ Recycling Contamination Checker & Disposal Guide | Check whether a common household item is ready for recycling, needs preparation, belongs at a special collection point, or should stay out of the recycling bin. | Environment Tools | Launch |
| ⭐ Refrigerant Leak CO2e Calculator | Calculate refrigerant leak CO2e from a known leaked mass or equipment charge and annual leak rate. Includes common refrigerants, sourced GWP100 factors, steps, and CSV export. | Environment Tools | Launch |
| ⭐ Solar Water Heater Savings & Payback Calculator | Estimate solar water-heating energy savings, annual bill savings, simple payback, break-even year, lifetime cash flow, and NPV. Free and private. | Environment Tools | Launch |
| ⭐ Wood Stove & Fireplace Emissions Calculator | Estimate annual particle emissions from a wood stove or fireplace using an appliance g/h rating or EPA AP-42 dry-wood factors. Includes moisture, units, steps, and CSV export. | Environment Tools | Launch |
| ⭐ Antifouling Bottom Paint Calculator – Coverage, Coats & Cans | Estimate boat bottom area, antifouling paint per coat, total volume, and whole cans from dimensions or measured area, coverage, coats, waste, and can size. | Marine & Boating | Launch |
| ⭐ Boat Shore Power Load Calculator – Amps, Watts & Circuit Capacity | Calculate boat shore power amps, watts, volt-amps, per-leg load, and remaining 30A, 50A, 16A, or 32A circuit capacity with power factor. | Marine & Boating | Launch |
| ⭐ Boat Trim and Weight Distribution Calculator | Calculate loaded boat longitudinal center of gravity, fore-and-aft load distribution, corrective weight shift, trimming moment, and optional trim change. | Marine & Boating | Launch |
| ⭐ Capsize Screening Formula Calculator for Sailboats | Calculate a sailboat's dimensionless capsize screening formula (CSF) from maximum beam and displacement, with metric and imperial inputs and clear safety limits. | Marine & Boating | Launch |
| ⭐ Knots, Nautical Miles & Beaufort Scale Converter | Convert knots, mph, km/h, m/s and Beaufort force, or convert nautical miles, statute miles, kilometers, meters and feet. Free and private. | Marine & Boating | Launch |
| ⭐ Marine Sacrificial Anode Sizing Calculator | Corrosion | Estimate marine sacrificial-anode current demand, amp-hours, required alloy mass, whole-anode count, installed capacity, and modeled service life. | Marine & Boating | Launch |
| ⭐ Marine Wire Size & Voltage Drop Calculator | DC Cable | Calculate marine DC copper wire size and voltage drop from volts, amps, cable length, insulation rating, engine-space heat, and conductor bundling. | Marine & Boating | Launch |
| ⭐ Marine Engine Propulsive Efficiency Calculator | Calculate marine propulsive efficiency, effective power, required engine or propeller power, vessel resistance, or speed from resistance-times-speed power. Supports marine and SI units. | Marine & Boating | Launch |
| ⭐ Sail Area-to-Displacement Ratio Calculator – SA/D | Calculate a sailboat's dimensionless sail area-to-displacement ratio (SA/D) from sail area and displacement, or derive working sail area from I, J, P, and E. | Marine & Boating | Launch |
| ⭐ Sailboat Ballast Ratio & Stability Calculator | Calculate sailboat ballast-to-displacement ratio and optionally estimate the ballast-only righting-moment contribution at a selected heel angle, with metric or imperial units. | Marine & Boating | Launch |
| ⭐ VHF Radio Horizon & Range Calculator | Marine | Estimate marine VHF radio horizon and two-antenna communication range from antenna heights, compare standard and geometric models, and check a planned path. | Marine & Boating | Launch |
| ⭐ Derivative Calculator with Steps and Graph | Differentiate functions step by step using product, quotient, chain, power, trigonometric, exponential, and logarithmic rules, with higher derivatives, point values, and graphs. | Calculus | Launch |
| ⭐ Integral Calculator with Steps and Graph | Calculate indefinite and definite integrals with symbolic antiderivatives, adaptive numerical fallback, bounds evaluation, verification, and shaded graphs. | Calculus | Launch |
| ⭐ Limit Calculator with Steps and Graph | Calculate two-sided, one-sided, and infinite limits with direct substitution, L’Hôpital’s rule, asymptotic analysis, DNE detection, and graphs. | Calculus | Launch |
| ⭐ Arc Length Calculator | Calculate the arc length of y=f(x) or a parametric curve x(t), y(t). See derivatives, the arc-length integral, a graph, numerical error estimate, and CSV export. | Calculus | Launch |
| ⭐ Differential Equation Calculator for First-Order ODEs | Solve first-order ODE initial-value problems y'=f(x,y) numerically with RK4, improved Euler, or Euler methods. View steps, graph points, and export CSV data. | Calculus | Launch |
| ⭐ Directional Derivative and Gradient Calculator | Calculate a symbolic gradient and directional derivative at a point. See vector normalization, partial derivatives, dot-product steps, and steepest-ascent direction. | Calculus | Launch |
| ⭐ Hessian Matrix and Critical Point Calculator | Calculate a symbolic Hessian matrix, find critical points numerically, and classify local minima, maxima, saddle points, or degenerate cases with steps. | Calculus | Launch |
| ⭐ Implicit Differentiation Calculator with Steps | Find dy/dx from an implicit equation with exact symbolic results, rule-by-rule steps, point evaluation, vertical-tangent checks, and private browser calculation. | Calculus | Launch |
| ⭐ Improper Integral Convergence Calculator | Test improper integrals for convergence over infinite intervals or near singularities. See one-sided limits, value estimates, absolute convergence and cutoff evidence. | Calculus | Launch |
| ⭐ Jacobian Matrix Calculator with Steps | Calculate a symbolic Jacobian matrix for up to six functions and variables. Evaluate it at a point and see every partial derivative step. | Calculus | Launch |
| ⭐ Calculus Optimization Calculator for Maximum and Minimum Values | Find absolute and local maximum and minimum values on a closed interval. Calculate derivatives, critical points, endpoints, classifications, and a graph in your browser. | Calculus | Launch |
| ⭐ Partial Derivative Calculator with Steps | Calculate first, higher-order, and mixed partial derivatives with exact symbolic results and rule-by-rule steps. Evaluate at a point, copy, or download the work. | Calculus | Launch |
| ⭐ Related Rates Calculator with Steps | Solve common related rates problems for circles, spheres, ladders, tanks, moving objects, and rectangles with formulas, substitutions, units, and steps. | Calculus | Launch |
| ⭐ Riemann Sum Calculator | Calculate left, right and midpoint Riemann sums for a function and interval. Compare approximations, inspect sample points, graph rectangles and download results. | Calculus | Launch |
| ⭐ Series Convergence Calculator with Tests and Steps | Test infinite series for absolute, conditional or divergent behavior. See the nth-term, p-series, comparison, ratio, root and alternating-test steps. | Calculus | Launch |
| ⭐ Surface Area of Revolution Calculator | Calculate surface area by rotating y=f(x) or a parametric curve around a line. See the integral, derivatives, graph, error estimate, and CSV data. | Calculus | Launch |
| ⭐ Tangent and Normal Line Calculator | Find tangent and normal line equations for y=f(x) at a point. See the derivative, slopes, point-slope forms, graph, and calculation steps. | Calculus | Launch |
| ⭐ Taylor and Maclaurin Series Calculator with Steps | Build Taylor and Maclaurin polynomials through order 10. See derivatives, coefficients, point approximations, errors and a graph with step-by-step working. | Calculus | Launch |
| ⭐ Volume of Revolution Calculator | Calculate volumes of revolution with disk, washer, or cylindrical shell methods. Enter functions, bounds, and an axis to see the integral, graph, error estimate, and CSV data. | Calculus | Launch |
| ⭐ Adjacency Matrix Generator from Graph Edges | Convert a directed or undirected graph edge list into an adjacency matrix. Include isolated vertices and loops, then copy as TSV or LaTeX or download CSV. | Discrete Mathematics | Launch |
| ⭐ Binary Relation Properties Calculator | Check whether a finite binary relation is reflexive, symmetric, transitive, antisymmetric, or irreflexive. See counterexamples, classifications, and closures. | Discrete Mathematics | Launch |
| ⭐ Boolean Algebra Simplifier with Truth Table | Simplify Boolean expressions into reduced SOP and POS forms, generate a complete truth table, and copy or download results. Free, private, and client-side. | Discrete Mathematics | Launch |
| ⭐ Cartesian Product Calculator | Calculate the Cartesian product of two to eight finite sets. Generate ordered tuples, check cardinality, copy results, and download CSV privately in your browser. | Discrete Mathematics | Launch |
| ⭐ Chinese Remainder Theorem Calculator with Steps | Solve systems of congruences with a Chinese Remainder Theorem calculator that shows exact steps and handles compatible non-coprime moduli. | Discrete Mathematics | Launch |
| ⭐ Graph Coloring Calculator — Find Chromatic Number and Coloring | Find the chromatic number of a simple undirected graph and get a valid minimum vertex coloring. Visualize color classes, copy results, and download CSV. | Discrete Mathematics | Launch |
| ⭐ Graph Theory Calculator | Enter an undirected or directed graph to calculate vertices, edges, degrees, density, connectivity, components, cycles, tree, bipartite, complete, regular, and Euler properties. | Discrete Mathematics | Launch |
| ⭐ Hasse Diagram Generator for Partially Ordered Sets | Generate a Hasse diagram from a finite partial order or cover relations. Validate the poset, find cover pairs, minimal and maximal elements, then copy or download results. | Discrete Mathematics | Launch |
| ⭐ Inclusion–Exclusion Principle Calculator | Calculate the union of 2 to 6 finite sets with inclusion–exclusion. Enter every intersection count and see exact terms, partial sums, and consistency checks. | Discrete Mathematics | Launch |
| ⭐ Modular Arithmetic Calculator | Check modular congruence, find modular inverses with the extended Euclidean algorithm, and calculate large modular powers with exact integer arithmetic. | Discrete Mathematics | Launch |
| ⭐ Power Set Calculator | Generate the complete power set of up to 15 unique elements. Filter subsets by size, copy results, and download CSV—all privately in your browser. | Discrete Mathematics | Launch |
| ⭐ Recurrence Relation Calculator and Sequence Generator | Generate terms from a recurrence relation and initial values. Supports a(n-k), n, arithmetic, powers, common functions, tables, copy, and CSV download. | Discrete Mathematics | Launch |
| ⭐ Set Operations Calculator | Calculate set union, intersection, differences, symmetric difference, and complements. Enter text or numbers, remove duplicates, copy results, or download CSV. | Discrete Mathematics | Launch |
| ⭐ Shortest Path Calculator — Dijkstra’s Algorithm Visualizer | Find the shortest path in a non-negative weighted graph with Dijkstra’s algorithm. Visualize each iteration, distances, predecessors, and relaxations. | Discrete Mathematics | Launch |
| ⭐ Breadth-First and Depth-First Search Graph Visualizer | Compare BFS and DFS traversal orders, then play every queue, stack, parent, depth, and backtracking step on a directed or undirected graph. | Discrete Mathematics | Launch |
| ⭐ Minimum Spanning Tree Calculator — Kruskal and Prim Visualizer | Find a minimum spanning tree or forest in an undirected weighted graph and visualize each Kruskal or Prim edge decision. | Discrete Mathematics | Launch |
| ⭐ Transitive Closure Calculator for Binary Relations | Find the transitive closure of a finite binary relation from ordered pairs or a 0–1 matrix. See added pairs, the closure matrix, and exportable results. | Discrete Mathematics | Launch |
| ⭐ Truth Table Generator for Propositional Logic | Generate complete propositional logic truth tables with intermediate steps. Supports NOT, AND, OR, XOR, implication, biconditional, constants, copy, and CSV download. | Discrete Mathematics | Launch |
| ⭐ Bayes’ Theorem Calculator — Prior, Likelihood & Posterior Probability | Calculate posterior probability from a prior and likelihood. Use a false-positive rate or evidence probability, with Bayes’ theorem steps, odds, and validation. | Statistics & Probability | Launch |
| ⭐ Confidence Interval Calculator — Mean, Proportion & Difference | Calculate confidence intervals for one mean, one proportion, two independent means, or two independent proportions. Includes t, z, Wilson, Welch, and Newcombe methods. | Statistics & Probability | Launch |
| ⭐ Correlation Coefficient Calculator — Pearson, Spearman & Significance | Calculate Pearson r and Spearman rho for paired data, with two-sided p-values, significance, a Pearson confidence interval, ranks, and a scatterplot. | Statistics & Probability | Launch |
| ⭐ Expected Value Calculator — Discrete Outcomes, Variance & Standard Deviation | Calculate expected value, variance, standard deviation, and E(X²) for a discrete probability distribution, with weighted contributions and clear steps. | Statistics & Probability | Launch |
| ⭐ Hypothesis Test Calculator — Z-Test, T-Test, P-Value & Critical Value | Calculate z-tests and t-tests for means and proportions. Get the test statistic, p-value, critical value, rejection region, and decision with formulas. | Statistics & Probability | Launch |
| ⭐ Margin of Error Calculator — Sample Size & Confidence Level | Calculate margin of error or required sample size for a proportion or mean. Supports custom confidence levels and finite population correction. | Statistics & Probability | Launch |
| ⭐ Normal Distribution Calculator — CDF, Probability & Critical Values | Calculate normal distribution CDF, upper-tail and interval probabilities, z-scores, density, percentiles, and one- or two-sided critical values. | Statistics & Probability | Launch |
| ⭐ Odds and Probability Converter | Convert decimal, fractional, and American moneyline odds to implied probability. See formulas, fair odds, and optional stake returns instantly. | Statistics & Probability | Launch |
| ⭐ Outlier Calculator — IQR, Z-Score & Modified Z-Score Methods | Find potential outliers using IQR fences, z-scores, and modified z-scores. Compare methods, inspect every value, and download results privately. | Statistics & Probability | Launch |
| ⭐ Percentile Calculator — Rank, Quartiles & Percentile Values | Calculate percentile rank, any percentile value, Q1, median, Q3, and IQR from a number list. Choose tie and interpolation methods and see the steps. | Statistics & Probability | Launch |
| ⭐ Probability Calculator | Calculate union, intersection, conditional probability, and complements. Check event consistency and see formulas, steps, percentages, and a Venn diagram. | Statistics & Probability | Launch |
| ⭐ Variance Calculator | Calculate population and sample variance, standard deviation, mean, deviations, and squared deviations from a number list with clear step-by-step results. | Statistics & Probability | Launch |
| ⭐ Arithmetic and Geometric Sequence Calculator | Find the nth term, finite sum, explicit formula, generated terms, and worked steps for arithmetic and geometric sequences. | Algebra & Equations | Launch |
| ⭐ Function Composition Calculator | Evaluate f(g(x)) with a composed rule, substitution steps, domain checks, and a reverse-order comparison. | Algebra & Equations | Launch |
| ⭐ Rational Equation Solver | Solve rational equations with original-domain restrictions, cleared-denominator steps, rejected candidates, and verification. | Algebra & Equations | Launch |
| ⭐ Inequality Solver | Solve linear inequalities with exact steps, interval notation, set-builder notation, and a number line. | Algebra & Equations | Launch |
| ⭐ Synthetic Division Calculator | Divide a polynomial by x − c with exact coefficients, a synthetic table, quotient, remainder, and a Remainder Theorem check. | Algebra & Equations | Launch |
| ⭐ Discriminant Calculator | Calculate Δ = b² − 4ac, classify real or complex roots, and identify whether real roots are rational. | Algebra & Equations | Launch |
| ⭐ Direct and Inverse Variation Calculator | Solve or verify direct and inverse variation with two x-y pairs, the constant k, optional units, and worked steps. | Algebra & Equations | Launch |
| ⭐ QR Decomposition Calculator | Factor a square or tall matrix with Householder steps, Q and R matrices, rank, and accuracy checks. | Linear Algebra | Launch |
| ⭐ Singular Value Decomposition Calculator | Factor tall, square, or wide matrices into U, Σ, and Vᵀ with singular values, rank, and accuracy checks. | Linear Algebra | Launch |
| ⭐ Matrix Rank and Nullity Calculator | Find rank, nullity, RREF, pivot and free columns, and bases for the null, column, and row spaces. | Linear Algebra | Launch |
| ⭐ Linear Independence and Basis Calculator | Test vectors for independence, extract a basis for their span, and inspect RREF and dependence relations. | Linear Algebra | Launch |
| ⭐ Null Space and Column Space Calculator | Find null-space and column-space bases, dimensions, RREF, pivot and free columns, and verification. | Linear Algebra | Launch |
| ⭐ Determinant Calculator | Calculate 2×2 to 5×5 determinants with a complete step-by-step cofactor expansion. | Linear Algebra | Launch |
| ⭐ Eigenvalue and Eigenvector Calculator | Find real or complex eigenvalues, eigenspace bases, multiplicities, and verification steps for 2×2 and 3×3 matrices. | Linear Algebra | Launch |
| ⭐ Matrix Diagonalization Calculator | Find P, D, and P⁻¹ over the real or complex numbers, with eigenspace, defect, and reconstruction steps. | Linear Algebra | Launch |
| ⭐ Row Reduction Calculator | Reduce rectangular or augmented matrices to REF or RREF with complete row-operation steps, rank, and pivot columns. | Linear Algebra | Launch |
| ⭐ Master Theorem Recurrence Complexity Calculator | Identify the Master Theorem case for a divide-and-conquer recurrence and follow the Big-Theta comparison step by step. | Discrete Mathematics | Launch |
| ⭐ Stirling Numbers and Bell Numbers Calculator | Calculate first-kind and second-kind Stirling numbers and Bell numbers with exact integer rows. | Discrete Mathematics | Launch |
| ⭐ Degree Sequence Graphicality Checker — Havel–Hakimi | Test whether a degree sequence is graphical, inspect every reduction, and construct one simple graph realization. | Discrete Mathematics | Launch |
| ⭐ Prüfer Code Encoder and Tree Decoder | Encode a labeled tree as a Prüfer sequence or decode a code into its unique tree with exact smallest-leaf steps. | Discrete Mathematics | Launch |
| ⭐ Euler Path and Circuit Finder for Graphs | Test directed or undirected graphs, construct a complete Euler trail, and diagnose connectivity or degree failures. | Discrete Mathematics | Launch |
| ⭐ Topological Sort Calculator for DAGs | Calculate a dependency order, levels, uniqueness, and Kahn’s algorithm steps, or identify a blocking cycle. | Discrete Mathematics | Launch |
| ⭐ Bipartite Graph Checker and Two-Coloring Visualizer | Find a valid two-coloring and graph partitions, or highlight an odd cycle proving a graph is not bipartite. | Discrete Mathematics | Launch |
| ⭐ Equivalence Relation and Equivalence Class Calculator | Test reflexivity, symmetry, and transitivity, then find every equivalence class and the induced partition. | Discrete Mathematics | Launch |
| ⭐ Warshall Algorithm Reachability Matrix Calculator | Compute positive or reflexive reachability from an adjacency matrix and inspect every Warshall iteration. | Discrete Mathematics | Launch |
| ⭐ CNF and DNF Converter | Convert propositions to canonical CNF and DNF, inspect minterm and maxterm indices, and verify every truth-table row. | Discrete Mathematics | Launch |
| ⭐ Logical Equivalence Checker | Compare two propositions across a complete truth table and highlight every counterexample when they differ. | Discrete Mathematics | Launch |
| ⭐ Karnaugh Map Simplifier | Build interactive two- to four-variable K-maps and find exact minimal SOP and POS forms. | Discrete Mathematics | Launch |
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