Free Online Calculators, Converters & Generators

Find the right tool among 951 fast, lightweight utilities for everyday tasks, work, study, and creative projects.

Free to use
Runs in your browser
No account required

Tool inputs and files are processed in your browser and are not sent to Starlight Tools. Advertising and analytics may process site-usage data according to your consent choices and our privacy policy.

Popular tools

Online Whiteboard

Quick sketches & diagrams; export as image. v1.0

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Molarity Calculator

Calculate mass, molecular weight, volume, or concentration for chemical solutions. v1.1

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$Fraction Pizza preview — visual fraction slices$

Fraction Pizza

Visualize fractions with a friendly pizza—choose slices, click to fill, and see fraction/decimal/percent update. Challenge mode included. v1.0

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Time Since/Until Calculator

See how long since a date or how much time remains until a future date/time. v1.0

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Browse tools by category

Explore calculators, converters, and generators for images, documents, text, web development, finance, health, geometry, algebra, statistics, discrete mathematics, linear algebra, number theory, construction, time and date, science, and more. The complete directory remains available below, while each category page provides a focused view of its tools.

Browse the full catalog →

Image & Graphics Tools (13 tools)

PDF, Document & Text Tools (18 tools)

Text & CSV Tools (12 tools)

Web Development Tools (34 tools)

Finance Tools (108 tools)

Health & Fitness Tools (25 tools)

Geometry Tools (43 tools)

Statistics & Probability Calculators (18 tools)

Algebra & Equation Calculators (27 tools)

Discrete Mathematics Calculators (32 tools)

Linear Algebra & Matrix Calculators (25 tools)

Calculus Calculators (19 tools)

Number Theory Calculators (18 tools)

Calculators (21 tools)

Construction Tools (37 tools)

Automotive & EV Calculators (33 tools)

Time & Date Tools (36 tools)

Science & Research Tools (87 tools)

Studio Tools (50 tools)

Random Generators (26 tools)

Cooking & Kitchen Tools (30 tools)

Agriculture & Gardening Tools (36 tools)

Environment & Sustainability (51 tools)

Logistics & Supply Chain Tools (24 tools)

Marine & Boating Calculators (33 tools)

Infrastructure & Systems Tools (57 tools)

Browser Games (15 tools)

Fun Calculators (23 tools) (23 tools)

Latest Updates

🌟 September 30, 2026: We’ve migrated Starlight Tools to a database-driven website to bring greater consistency to our 900+ tools. We’ve also revised many tools, added new features and fixed edge cases.

🌟 August 1, 2026: We have added dedicated Automotive & EV Tools and Marine & Boating Tools categories, bringing together practical calculators for vehicles, electric cars, boats, sailing, navigation, fuel planning, and ownership.

🌟 June 30, 2026: Starlight Tools has now crossed 600 tools sitewide. Thank you for helping this collection keep growing across calculators, generators, converters, and browser-based utilities.

🌟 June 13, 2026: Starlight Tools is 1 year old. Thank you for using the site and helping us grow this collection of free, privacy-first browser tools. See the anniversary artwork on our Fan Art and Wallpapers page.

🌟 April 20, 2026: Some of our calculators are getting a v1.1 upgrade with more features, clearer results, and smoother browser-based workflows.

🌟 April 4, 2026: As Starlight Tools continues to grow, we’re rolling out stronger quality-control checks across our tools and website to improve consistency, reliability, and the overall experience.

🌟 March 30, 2026: We’ve now crossed 500 tools sitewide. Thank you for using Starlight Tools as we keep expanding the collection with more privacy-first, browser-based tools.

Read all update notes →

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