Universal Unit Converter

Pick which physical quantity you are converting. The unit selector below adapts to this choice, and the result lists your value in every unit of that quantity at once.

The number you want to convert, given in the unit selected below. The result shows this value expressed in every other unit of the chosen quantity.

The length unit your value is in now. The result converts it to all other length units, from millimetres to miles.

The mass unit your value is in now; the result converts it to all the others, from grams to pounds and tonnes.

The pressure unit your value is in now, converted to all the others: pascal, bar, psi, atmospheres and more.

The energy unit your value is in now. Food calories (kcal), joules and kilowatt-hours all measure the same thing and convert exactly.

The speed unit your value is in now, converted to km/h, mph, m/s, knots and the rest.

The data-size unit your value is in now. Decimal units (kB, MB) use powers of 1000; binary ones (KiB, MiB) use powers of 1024, so 1 GiB ≈ 1.074 GB.