About Computezy
Free, browser-based calculators and tools for math, science, health, finance, and development — no download, no sign-up, no nonsense.
What it is
Computezy is a growing collection of free, browser-based tools that work instantly without any installation or account. Each tool is purpose-built to be fast, accurate, and genuinely useful — the kind of utility you'd normally need to download an app or find a cluttered website for.
Everything runs in your browser. No data is sent to any server. Open a tool, use it, close the tab — there's nothing left behind.
Our tools
200 tools are available across 13 categories. Nearly every tool runs entirely in your browser with no data sent to any server — the one exception is the Currency Converter, which fetches live exchange rates.
Everyday Tools
Pixel-accurate virtual ruler calibrated to your screen's actual physical size. Supports cm, mm, inches, and three calibration methods.
Find your exact age in years, months, days, hours and minutes from any birth date.
Live word, character, sentence and paragraph counter with reading time estimate — no button clicks needed.
Convert text to UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, and kebab-case instantly.
Animated spinning wheel for fair random picks from any list — perfect for giveaways, classrooms, and decisions.
Calculate the exact number of days, weeks or months between any two dates.
Health & Wellness
Calculate your BMI in metric or imperial units with WHO weight category and healthy-weight range.
Estimate Total Daily Energy Expenditure from BMR and activity level, metric or imperial.
Estimate daily water needs from body weight and activity level in metric or imperial units.
Understand energy balance and estimate maintenance calories with clear safe-use guidance.
Find your five training zones from age and max heart rate, with optional resting-HR personalisation.
Check transfusion compatibility and predict a child's possible blood types from the parents' types.
Alternates 3-minute fast and slow walking cycles (Japanese interval walking protocol) with audio cues.
Customisable HIIT interval timer with adjustable work/rest periods, rounds, audio cues, and wake lock.
Developer Tools
Format, validate, minify and compare JSON data instantly — all client-side.
Decode and inspect JWT tokens or encode new ones. Your tokens never leave the browser.
Math & Science
Solve any quadratic with step-by-step working, real and complex roots, and a parabola graph.
Approximate the area under a curve with left, right, midpoint, and trapezoidal sums, visualised on a graph.
Population and sample standard deviation with full step-by-step working, mean, variance, and more.
Range, max height, flight time, and impact velocity with an animated trajectory canvas.
See your weight across the Solar System and the real TRAPPIST-1 exoplanet system.
Molar mass for any chemical formula with per-element breakdown, percent composition, and mole conversion.
Finance
How we build
No barriers
No sign-up, no paywall, no mandatory download. Open the URL and start using it.
Privacy by default
Tools process your input locally in the browser. Nothing you type or measure is sent anywhere.
Built for accuracy
We take precision seriously. The ruler calibrates to your actual screen density; the counter matches the word-counting rules of major word processors.
Always free
No premium tier, no feature gates. Every tool is free in full, for personal and commercial use.
What's coming
More tools are being added across every category — regex tester, UUID generator, and SQL formatter for developers; geometry and trigonometry tools; biology and more computer science visualisers; and many more health and math tools. Each will follow the same standard: open and use, no friction.