Length Converter

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Convert between metric and imperial lengths: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles.

Value

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Change the value or the units to convert instantly.

Flagship pairs

Quick conversions

From	Equals
1 cm	0.393701 in
1 in	2.54 cm
1 km	0.621371 mi
1 mi	1.60934 km
1 m	3.28084 ft

Formula & method

All lengths convert through meters: value × (from-factor ÷ to-factor). 1 inch = 2.54 cm exactly; 1 mile = 1,609.344 m.

Worked example

100 cm = 39.3701 inches. 5 km = 3.10686 miles. 6 feet = 1.8288 meters.

FAQ

Why is 1 inch exactly 2.54 cm?: The inch was fixed internationally at exactly 25.4 mm in 1959.
What is a nautical mile?: 1,852 meters, based on one minute of latitude. It is used in aviation and shipping.
How many feet are in a mile?: 5,280 feet.

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