Unit Converter

This unit converter handles ten measurement categories — length, weight, area, volume, speed, time, pressure, energy, digital data and temperature. Pick a category, type a value, choose the units you are converting from and to, and the result appears instantly; a swap button flips the two units so you can convert back the other way without retyping.

Under the hood each category converts through a single base unit. Lengths are normalised to metres, weights to grams, volumes to litres, and so on: your value is multiplied by the source unit's factor and divided by the target's. The factors are the exact defined ones — one inch is 0.0254 metres, one pound is 453.59237 grams, one US gallon is 3.785411784 litres — so conversions are precise to several significant figures. Temperature is the exception: because Celsius, Fahrenheit and Kelvin have different zero points, it is converted through Celsius rather than by a simple ratio.

The data category deliberately includes both decimal and binary sizes, so you can convert kilobytes (1,000 bytes) as well as kibibytes (1,024 bytes) and their larger cousins. Everything is calculated in your browser with no network calls, so results are immediate and your numbers never leave your device.