Length Converter
Convert between meters, feet, inches, centimeters, miles, kilometers and other length units.
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Length units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the meter (m).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Nanometer | nm | SI | = 1e-9 m |
| Micrometer | µm | SI | = 0.000001 m |
| Millimeter | mm | SI | = 0.001 m |
| Centimeter | cm | SI | = 0.01 m |
| Meter | m | SI | Base unit |
| Kilometer | km | SI | = 1000 m |
| Ångström | Å | metric | = 1e-10 m |
| Mil (thou) | mil | US customary | = 0.0000254 m |
| Inch | in | US customary | = 0.0254 m |
| Foot | ft | US customary | = 0.3048 m |
| Yard | yd | US customary | = 0.9144 m |
| Mile | mi | US customary | = 1609.344 m |
| Nautical mile | nmi | other | = 1852 m |
Meter quick reference
| Meter | Millimeter | Centimeter | Kilometer |
|---|---|---|---|
| 1 m | = 1000 mm | = 100 cm | = 0.001 km |
| 10 m | = 10000 mm | = 1000 cm | = 0.01 km |
| 100 m | = 100000 mm | = 10000 cm | = 0.1 km |
| 1000 m | = 1000000 mm | = 100000 cm | = 1 km |
Among the 13 length units on this page, the smallest is the ångström (Å) and the largest is the nautical mile (nmi).
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About length units
The meter is the SI base unit of length. Since 1983 it has been defined through the speed of light: the distance light travels in vacuum in 1/299,792,458 of a second.
US customary and imperial lengths are defined from the meter. Since the 1959 international yard and pound agreement, one inch is exactly 25.4 mm and one foot is exactly 0.3048 m, so conversions between the systems are exact.
Frequently asked questions
- How many centimeters are in an inch?
- Exactly 2.54 centimeters. This has been the definition of the inch since 1959.
- Is a nautical mile the same as a mile?
- No. A nautical mile is exactly 1852 meters, while a statute mile is exactly 1609.344 meters. Nautical miles are used at sea and in aviation.
- How many millimeters are in one meter?
- One meter = 1000 mm (millimeters).
- How many centimeters are in one meter?
- One meter = 100 cm (centimeters).
- How many kilometers are in one meter?
- One meter = 0.001 km (kilometers).