Unit Converters
Length, weight, volume, area, speed, temperature and data unit conversions.
- Length ConverterEnter a length, choose the unit it is in and the unit you want.
- Weight ConverterEnter a weight, choose the unit it is in and the unit you want.
- Area ConverterEnter an area, choose the unit it is in and the unit you want.
- Speed ConverterEnter a speed, choose the unit it is in and the unit you want.
- Pressure ConverterEnter a pressure, choose the unit it is in and the unit you want.
- Energy ConverterEnter an amount of energy, choose the unit it is in and the unit you want.
- Fuel Economy ConverterEnter a fuel economy figure, choose the unit it is in and the unit you want.
- Time ConverterEnter an amount of time, choose the unit it is in and the unit you want.
- Volume ConverterEnter a volume, choose the unit it is in and the unit you want.
How these unit converters work
Every converter on this page multiplies by a fixed factor, and the factors that are exact by definition are used exactly: one inch is 2.54 centimeters, one pound is 0.45359237 kilograms, one mile is 1,609.344 meters and one U.S. gallon is 3.785411784 liters. Because the factor is exact, converting there and back returns the number you started with, apart from display rounding.
Check which unit system a name belongs to before you convert. A U.S. gallon is not an imperial gallon, a U.S. fluid ounce is not an imperial fluid ounce, and a ton can mean 2,000 pounds, 2,240 pounds or 1,000 kilograms. The Fuel Economy Converter is the one non-obvious case: miles per gallon and liters per 100 kilometers are inverses of each other, so a higher mpg means a lower L/100 km. For temperature and for data sizes, see the Temperature Converter in Everyday Calculators and the Data Storage Converter in Technology Calculators.