Convert between binary, octal, decimal, and hex instantly. Supports negatives, BigInt, prefixes, and 4-bit grouping — all client-side. v1.0
Calculate your GPA for high school or college, including cumulative and "what do I need" options. v1.0
Calculate your Body Mass Index (BMI) using imperial or metric units. v1.0
Compare BMI with body fat % using US Navy & Deurenberg methods — metric/imperial, friendly categories, mini chart. v1.0
Estimate Basal Metabolic Rate using Mifflin–St Jeor, Harris–Benedict, Katch–McArdle, and Schofield formulas — with quick TDEE multipliers. v1.0
Estimate daily maintenance & goal calories with activity multipliers—100% client-side and private. v1.0
Solve any triangle by entering the three values that you know. v1.0
Solve radius, diameter, circumference, and area from any one value. Units, decimal places, and π precision — all client-side for privacy. v1.0
Solve quadratic equations (ax² + bx + c = 0) and see the step-by-step solution. v1.0
Solve for a missing ratio value and visualize the relationship. v1.0
Add, subtract, multiply, and divide fractions & mixed numbers — with automatic simplification, steps, and decimals. v1.0
Solve proportions step by step — find the missing value in “a is to b as c is to ?”. v1.0
Calculate the mean, median, mode, range, and other key statistics for a set of numbers. v1.0
Paste numbers to get mean, variance, σ (population/sample), and per-value z-scores — 100% client-side and private. v1.0
Enter n,p,k (or λ,k) to get PMF/CDF, expected value, variance, and a clean probability graph — 100% client-side. v1.0
Compute the arithmetic mean instantly. Supports spaces, commas, and new lines, plus adjustable precision — all client-side. v1.0
Enter a base and exponent in a kid-friendly xy layout. Supports negatives, zero exponents, and scientific notation. v1.0
Check if a number is prime and see its full prime factorization with exponents — instant, private, and student-friendly. v1.0
Convert standard ↔ scientific & engineering notation, with E-notation and significant figures—100% client-side. v1.0
Compute ln, log10, log2, and log base b with change-of-base and antilog — 100% client-side. v1.0
Compute nPr and nCr — with or without repetition. Exact BigInt results plus scientific approximation. v1.0
Compute least common multiple and greatest common factor for any list of integers — BigInt support, 100% client-side. v1.0
Calculate mass, molecular weight, volume, or concentration for chemical solutions. v1.1
Calculate unknown concentrations or volumes using the C1V1=C2V2 formula. v1.0
Estimate your one-repetition max using Epley, Brzycki, and Lombardi formulas. v1.0
Plan even or negative splits for 5K/10K/Half/Marathon with per-km/mi tables and CSV export — 100% client-side. v1.0
Enter any two (pace, speed, time, or distance) and compute the third. Km/mi aware, instant conversions. v1.0
Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur. v1.0
Calculate the distance between two points (x1, y1) and (x2, y2) on a 2D plane. v1.0
Find the straight-line distance between two points in a 3D coordinate system. v1.0
Convert length, mass, temperature, area, volume, speed, time, and digital storage — all client-side for privacy. v1.0
Compare two tire sizes (e.g., 225/45R17 vs 235/40R18) by sidewall, diameter, circumference, revs per mile/km, ride height, and speedometer error. v1.0
Enter IPv4 or IPv6 CIDR (e.g., 192.168.1.10/24, 2001:db8::/48) to see network, range, and counts — all client-side for privacy. v1.0
Enter any two values (V, I, R, P) to instantly compute the other two. Includes unit scaling and step-by-step formulas. v1.0
Compute real (P), apparent (S), and reactive (Q) power from V, I, and pf/angle — single- or three-phase. Client-side & private. v1.0
Compute direct current power with P = V × I — enter any two of V, I, R, P and get the rest. School-friendly, client-side, private. v1.0
Solve any one of Vin, Vout, R1, or R2 from the other three. Includes load simulation, current, and power — all client-side. v1.0
Convert between dB, dBm, dBW, and Watts — with optional 50 Ω Vrms/Vpp/Irms readouts. 100% client-side. v1.0
Convert between wavelength and frequency using λ = c/(n·f). Choose a medium (vacuum, air, water, glass) or enter refractive index. Extras: period, wavenumber, photon energy. 100% client-side. v1.0
Estimate UPS runtime, required battery capacity, and proper kVA sizing from load, voltage, and backup needs. 100% client-side and private. v1.0
Estimate usable capacity, redundancy overhead, and fault tolerance for RAID 0, 1, 5, 6, 10, 50 & 60 — all client-side. v1.0
