Length Converter (mm, cm, m, km, in, ft, yd, mi)
Convert a length or distance between metric units (millimeters through kilometers) and imperial/US units (inches through miles). Runs entirely in your browser — nothing is sent to a server.
How it works
Every unit is converted through a common base unit — the meter. Each unit defines how many meters it equals (e.g. 1 mile = 1609.344 m); to convert from any unit to any other, the value is first converted to meters, then from meters to the target unit. Nautical miles (used in aviation and shipping) are included alongside the everyday metric and imperial units.
Common conversions
| From | To | Result |
|---|---|---|
| 1 m | ft | 3.28084 ft |
| 1 in | cm | 2.54 cm |
| 1 mi | km | 1.60934 km |
| 1 km | mi | 0.62137 mi |
| 5 ft 10 in | cm | 177.8 cm (5×30.48 + 10×2.54) |
FAQ
How many centimeters is one inch?
Exactly 2.54 cm — this is the internationally defined value, not a rounded approximation.
What's the difference between a mile and a nautical mile?
A statute mile (1.609 km) is the everyday road-distance mile. A nautical mile (1.852 km) is based on one minute of latitude and is used in maritime and air navigation.