Unit Converter

Fourteen categories in one tool: type a value in any unit and every other unit updates at once, from time and bytes to degrees and fuel economy.

Everything is calculated in your browser: no value is sent anywhere, and your favourites stay on your device.

Free · no sign-up

About this tool

This unit converter brings fourteen categories together on one page: time (from picoseconds to millennia, including weeks, average months, years, decades and centuries), digital data (bit, nibble, byte, decimal prefixes from kilo to quetta and binary prefixes from kibi to yobi), temperature (Celsius, Fahrenheit, kelvin, Rankine), speed (m/s, km/h, mph, knots, Mach), length, area, volume with cups and spoons, mass, pressure, energy, power, angle, fuel economy and frequency. It handles the everyday questions in one move: converting seconds to minutes, bytes to megabytes, MB to GB, Celsius to Fahrenheit, km/h to mph or L/100 km to miles per gallon.

Type a value in the main field or straight into any row of the table: every unit in the category is shown at the same time. You can set the number of significant digits, switch between decimal and scientific notation, copy a value in one click and swap the units. The search understands symbols and phrases such as “GB”, “mph” or “5 km to miles”. Conversions you star and the ones you used last stay on your device, and the page link keeps the category, value and units so you can share it.