Length converter
Convert lengths between metres, kilometres, feet, inches, and more instantly.
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How it works
Converts between metric and imperial length units: millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles. Every conversion goes through the metre as the base unit.
Formula
target value = value × (metres per source unit ÷ metres per target unit)
Example
5 km = 3.107 miles. And 1 mile = 1.609344 km exactly, by definition.
Frequently asked questions
How many centimetres is an inch?
Exactly 2.54 cm. The international inch was defined that way in 1959.
Which mile is used?
The international statute mile (1,609.344 m). It is not the nautical mile, which is 1,852 m.