How many unit categories are supported?

Eight: length, weight, temperature, area, volume, speed, time and data storage, each with several common units.

Is temperature conversion handled differently?

Yes — Celsius, Fahrenheit and Kelvin use their own conversion formulas rather than a simple multiplier, since they don't share a common zero point.

Convert between length, weight, temperature, area, volume, speed, time and data units.

Pick a category — length, weight, temperature, area, volume, speed, time or data storage.
Enter a value and choose the "from" and "to" units.
Use the swap button to quickly reverse the conversion direction.

Converting recipe measurements or DIY project dimensions between metric and imperial.
Checking file sizes in different units (MB, GB) or converting speeds and distances while traveling.
Quick unit conversions for schoolwork, cooking or engineering.

Calculate a percentage of any value instantly.

A calculator for everyday arithmetic, with an optional scientific mode for trig, logs and powers.

Calculate the maturity amount and interest earned with compounding.

Calculate simple interest and the total amount payable.