Convert length between metric and imperial: mm, cm, m, km, inches, feet, yards, and miles. All units at once.
Enter a length in any unit and instantly see the equivalent in all metric and imperial units: millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles. All conversions use exact defined ratios — results are shown to 6 significant figures.
Type a value in the number box and select the source unit from the dropdown. All other units update instantly in the cards below.
All conversions use exact or internationally-defined ratios (e.g. 1 inch = 25.4 mm exactly). Results are shown to 6 significant figures.
A statute mile is 1,609.34 m. A nautical mile is 1,852 m — about 15% longer — and is used in aviation and maritime navigation.
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