About AllUnits.org

AllUnits.org is a free online reference for unit conversions. No signup, no tracking, no intrusive ads — just fast, accurate conversions when you need them.

Every converter on this site is built for mobile-first use. We know most people look up conversions on their phone — walking, driving, cooking, shopping, or traveling — so we designed our calculators to be one-tap friendly.

All conversion formulas are verified against international standards. Common values are pre-populated for quick taps. Your recent conversions are stored locally on your device (never sent anywhere).

If you find an error or want a conversion added, feel free to let us know.