About the Unit Converter
Most of the world uses the metric system, while the United States and a few other places still use imperial or US customary units. This converter handles everyday conversions between both systems, such as kilometres to miles, kilograms to pounds, Celsius to Fahrenheit, square metres to square feet, litres to gallons and km/h to mph. The conversion factors are the exact international definitions (for example, 1 inch = 2.54 cm exactly), and a table shows your value in every unit at once.
How to use it
- Choose what you are measuring: length, weight, temperature, area, volume or speed.
- Enter a value and choose the units to convert from and to.
- Read the result, or use the swap button to reverse the conversion.
- See the table below for the same value in every other unit.
Frequently asked questions
How many kilometres are in a mile?
One international mile is exactly 1.609344 kilometres, so 1 kilometre is about 0.621 miles.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C × 9/5 + 32 = 68 °F. To go back, subtract 32 and multiply by 5/9.
Why are there two kinds of gallons?
The US gallon (3.785 litres) and the imperial gallon used in the UK (4.546 litres) are different units. US cups, pints and fluid ounces are also used in this converter.