Length converter
Convert metric and imperial units of length – from millimetres to nautical miles – instantly and with exact factors.
1 m=3.2808399 ft
Conversion to all units
| millimetre (mm) | 1,000 |
| centimetre (cm) | 100 |
| kilometre (km) | 0.001 |
| inch (in) | 39.370079 |
| foot (ft) | 3.2808399 |
| yard (yd) | 1.0936133 |
| mile (mi) | 0.0006213712 |
| nautical mile (NM) | 0.0005399568 |
How length conversion works
Enter a value and pick the source and target units – the result is calculated instantly, and below it you'll find the conversion to every other unit at once. Calculations go through the base unit metre, so any combination of units works.
Imperial units have exactly defined metric equivalents: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 yard = 0.9144 m and 1 mile = 1,609.344 m. The nautical mile, used in aviation and shipping, is exactly 1,852 m.
Conversion examples
| Value | Result |
|---|---|
| 1 in | 2.54 cm |
| 1 ft | 0.3048 m |
| 1 yd | 0.9144 m |
| 1 mi | 1.60934 km |
| 10 km | 6.21371 mi |
| 100 m | 328.084 ft |
Frequently asked questions
How many centimetres are in an inch?
One inch is exactly 2.54 cm. This has been the internationally binding definition since 1959 – it is not a rounding.
How many kilometres is a mile?
A statute mile is exactly 1.609344 km. For a quick estimate, multiply by 1.6 – for example, 10 miles is roughly 16 km.
What is the difference between a mile and a nautical mile?
A statute mile is 1,609.344 m, a nautical mile is 1,852 m. The nautical mile derives from one minute of arc of latitude and is used in aviation and at sea.
How many feet are in a metre?
One metre is roughly 3.2808 feet. Conversely, one foot is exactly 0.3048 m, i.e. 30.48 cm.
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Last updated: 15 July 2026