Why we built CalculUnits
CalculUnits started with a simple frustration: every conversion search led to a page buried under pop-ups, cookie walls and five paragraphs of filler before the actual answer. We believed a converter could do one thing perfectly — show the number, instantly — and still be sustainable.
How it works
Every conversion on this site runs entirely in your browser. The values you enter never reach our servers — there's no account, no tracking of your calculations, nothing to store. The conversion factors come from official SI and NIST references, and each page shows the exact formula so you can verify the math yourself.
What you'll find
60+ units across 9 categories (length, weight, temperature, volume, area, speed, data, time, energy), plus everyday calculators: BMI with WHO categories, percentages, loan payments with full amortization, and compound interest. Ten of our most-used conversions include real-world examples, common mistakes and mental-math shortcuts.
How we stay free
Non-intrusive advertising — clearly labeled, never between you and your answer. No paywalls, no premium tier, no selling of data. That's the whole business model.
Contact: contact@calculunits.com — a real human reads everything, usually within 1–2 business days.