Length Converter
Convert millimeters, centimeters, meters, kilometers, inches, feet, yards and miles instantly.
Enter a value and choose the unit you are converting from and the unit you want. The converted value and the rate between the two units update live as you type.
All conversions are routed through meters. Common factors are: 1 inch = 0.0254 m, 1 foot = 0.3048 m, 1 yard = 0.9144 m, and 1 mile = 1609.344 m. Metric units use powers of ten: 1 cm = 0.01 m and 1 km = 1000 m.
Use the swap button to reverse the direction, for example to switch from inches to centimeters and back again.
Frequently asked questions
How many centimeters are in an inch?
One inch is exactly 2.54 centimeters. That is the definition used by this converter, so inch-to-cm results are exact.
How do I convert miles to kilometers?
One mile equals 1609.344 meters, which is 1.609344 kilometers. Multiply miles by 1.609344 to get kilometers.
Does this converter use US customary or imperial units?
It uses the international yard and pound agreement values, so inches, feet, yards and miles match both US customary and imperial standards.