About Unit converters
Convert between metric and imperial units without a lookup table: length, weight, temperature, area, volume, speed, data, pressure, energy and angle. Type one amount and see it in every unit of that kind at the same time, which makes checking a recipe, a running distance or a drive capacity quick.
The factors are the exact international definitions wherever one exists — an inch is exactly 0.0254 metres and a pound exactly 0.45359237 kilograms — so only the display is rounded. Decimal and binary data units are listed separately, and US and UK gallons are kept apart, because those two pairs cause most of the silent errors in everyday conversions.
Frequently asked questions
Are the conversion factors exact?
Yes. Exact definitions are used where they exist, so the only rounding happens when the number is displayed. That is why 1 mile shows as exactly 1.609344 kilometres.
Is my data uploaded?
No. Every conversion runs in your browser, so the values you type never leave your device.