About AllCalculators
AllCalculators started from a simple frustration: the calculator you need is almost always buried behind ads, sign-up walls, or cluttered pages that take longer to load than the math takes to do. We set out to build the opposite — a fast, clean, and free collection of calculators covering health, everyday life, science and math, finance, marketing, business, e-commerce, sports, and crypto, all in one place.
Every calculator is built on a well-documented, publicly verifiable formula — the Mifflin-St Jeor equation for metabolic rate, the standard amortization formula for mortgages, the WHO BMI classification, and so on — so you're never left guessing how a result was produced. We add new calculators regularly based on what people actually search for and need.
Free, always
Every calculator on this Site is free to use, with no sign-up, subscription, or paywall — and it will stay that way.
Transparent methods
We show the formula behind every result instead of hiding it behind a black box, so you can understand and verify how a number was reached.
Privacy by design
Every calculation runs in your browser. What you type into a calculator never leaves your device or gets stored on our servers.
Built for everyone
From students checking a GPA to homeowners comparing mortgage payments, our calculators are designed to be simple enough for anyone to use.
How we build and check every calculator
- Start from a published method. Each calculator uses an established formula or official reference — for example the ICC's Standard Edition table for DLS targets, the WHO classification for BMI, and the standard amortization formula for loans.
- Recalculate every example independently. Worked examples and tables in our guides are recomputed with a separate script before publishing, and calculators that have official worked examples must reproduce them exactly.
- Show the working. Every calculator page explains how the result is calculated, and the guide below it covers the formula, worked examples, and limitations.
- Fix problems quickly. If you spot a result that looks wrong, tell us through the Contact page. We check every report, correct the calculator or guide if needed, and update its "last reviewed" date.
A note on accuracy
Our calculators are estimation tools built on standard formulas, not a substitute for professional medical, financial, or legal advice. See our Disclaimer for details.
Explore our calculators
Have feedback, a calculator request, or found something that looks off? We'd love to hear from you on our Contact Us page.