Length Converter

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

cm = mm × 0.1

Length units and how they relate

The inch is defined as exactly 25.4 mm, the foot as exactly 0.3048 m and the mile as exactly 1,609.344 m (international agreement of 1959). The nautical mile is exactly 1,852 m.

UnitSymbolEquals in millimeters
1 millimetermm1 mm
1 centimetercm10 mm
1 meterm1,000 mm
1 kilometerkm1,000,000 mm
1 inchin25.4 mm
1 footft304.8 mm
1 yardyd914.4 mm
1 milemi1,609,344 mm
1 nautical milenmi1,852,000 mm
1 micrometerµm0.001 mm

Popular length conversions

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Frequently asked questions

How accurate is this length converter?

It uses the exact defined conversion factors for each unit and shows results to 10 significant digits. The inch is defined as exactly 25.4 mm, the foot as exactly 0.3048 m and the mile as exactly 1,609.344 m (international agreement of 1959). The nautical mile is exactly 1,852 m.

How do I convert millimeters to centimeters?

Enter the value, choose millimeters in the "From" list and centimeters in the "To" list. For example, 1 millimeter equals 0.1 cm.

Is the converter free?

Yes. It is free, needs no sign-up and runs entirely in your browser, so it also works offline once the page has loaded.

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