Convert any unit, instantly
Recipes in cups, tyre pressures in psi, a weather forecast in Fahrenheit, a parcel weight in pounds — everyday life is full of units that don't match the ones you know. This unit converter handles ten kinds of measurement and nearly 100 units, metric and imperial, and shows your value in every unit of that type at the same time. It runs instantly in your browser.
Measurements covered
- Length – metres, kilometres, centimetres, millimetres, miles, yards, feet, inches, nautical miles and more.
- Weight – kilograms, grams, tonnes, pounds, ounces, stone, US and UK tons, carats.
- Temperature – Celsius, Fahrenheit, Kelvin and Rankine.
- Volume – litres, millilitres, cubic metres, US and UK gallons, pints, fluid ounces, cups, tablespoons and teaspoons.
- Area – square metres, hectares, acres, square feet, square miles and more.
- Speed – km/h, m/s, mph, knots, ft/s.
- Time – milliseconds to years.
- Data – bits and bytes in decimal (KB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) units.
- Pressure – pascals, kPa, bar, psi, atmospheres, mmHg, inHg.
- Energy – joules, calories, kilocalories, watt-hours, kWh, BTU, electronvolts.
Popular conversions
| From | To |
|---|---|
| 1 inch | 2.54 cm |
| 1 foot | 30.48 cm |
| 1 mile | 1.609344 km |
| 1 kg | 2.20462 lb |
| 1 stone | 6.35029 kg |
| 0 °C | 32 °F |
| 100 °C | 212 °F |
| 1 US gallon | 3.78541 L |
| 1 acre | 4,046.86 m² |
| 1 bar | 14.5038 psi |
| 1 kcal | 4.184 kJ |
Metric vs. imperial
The metric system (SI) is used officially by almost every country. It is decimal: each unit is 10, 100 or 1,000 times the next, so conversions within the system only move the decimal point. The imperial and US customary systems use historical units — 12 inches in a foot, 3 feet in a yard, 16 ounces in a pound — and are still common in the United States and, for some purposes, the United Kingdom. Since 1959, imperial units have been defined exactly in metric terms, which is why conversions like 1 inch = 2.54 cm are exact.
For other conversions, see the Time Zone Converter, or calculate your BMI from height and weight with the BMI Calculator.