Length Converter
Convert any length or distance between metric and imperial units — millimetres, centimetres, metres, kilometres, inches, feet, yards and miles — by entering a value and choosing the units.
Metric and imperial lengths
The metric system (mm, cm, m, km) scales in powers of ten, which makes conversions between its units straightforward. The imperial system (inches, feet, yards, miles) uses fixed factors: 12 inches to a foot, 3 feet to a yard, and 1,760 yards to a mile.
Converting between the two relies on the exact definition that one inch equals 2.54 centimetres, from which every other cross-system conversion follows.
Common conversions
Everyday examples include centimetres to inches for screen and clothing sizes, metres to feet for height, and kilometres to miles for distances and speeds. This converter handles all of them with full precision and rounds the display sensibly.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 centimetres. So to convert inches to centimetres, multiply by 2.54; to go the other way, divide by 2.54.
How do I convert kilometres to miles?
Multiply kilometres by 0.621371, or just enter the value above and select km to miles.