Converter

Convert length, weight, temperature, area, volume, speed, time, data, pressure and energy — live, with every unit in the category converted at once.

Convert length and distance between centimetres, inches, feet, metres, yards, miles and more — with every unit in the category listed at once.

Convert weight and mass between kilograms, pounds, ounces, stones, grams and tonnes, using exact definitions, with all units shown side by side.

Convert Celsius, Fahrenheit, Kelvin and Rankine with the formula shown and a check against absolute zero — the conversion most calculators get wrong.

Convert between seconds, minutes, hours, days, weeks, months and years, with averaged units clearly marked so the numbers are never misleading.

Convert between 30 currencies using European Central Bank reference rates, with the rate date shown, no ads and no transfer upsell. Works offline from cache.