About Calixo

Calixo is a free calculator platform with 197+ tools spanning 13 categories — finance, health, math, engineering, construction, IT & developer utilities, date & time, unit conversion, AI, CCTV & networking, geo & mapping, and a handful of oddly-specific calculators you won't find bundled together anywhere else.

Why we built it

Most calculator sites make you dig through ads, pop-ups, or a clunky interface just to divide two numbers. We wanted something different: type your numbers in, get your answer instantly, with no "Calculate" button, no sign-up, and no account required. Every calculator on Calixo updates live as you type.

How it works

Every calculator on the Site is powered by the same small, careful calculation engine — the exact formulas and logic are documented right on each calculator's page, alongside worked examples and an explanation of what the result means. We verify non-trivial formulas against known reference values before publishing them, and we'd rather skip a calculator entirely than publish one we're not confident is correct — you can read more about our approach to accuracy in each calculator's "Limitations" section where relevant.

What we don't do

We don't require an account. We don't operate a server-side database of your personal information. Favorites, history, and saved scenarios are stored only in your own browser. See our Privacy Policy for the full picture.

Get in touch

Found a bug, have a calculator idea, or spotted something that looks wrong? We'd genuinely like to hear about it — visit our Contact page.