Length Converter
A length converter converts between metric (meters, km, cm, mm) and imperial (feet, inches, miles, yards) units. The metric system uses powers of 10; the imperial system uses irregular multipliers inherited from historical standards.
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Tip: Rough conversion shortcuts: 1 km ≈ 0.6 miles, 1 meter ≈ 3.3 feet, 1 inch ≈ 2.5 cm. For km to miles: multiply by 0.6 (or divide by 1.6).
- 1The base SI unit is the meter (m)
- 21 inch = 2.54 cm exactly (defined since 1959)
- 31 mile = 5,280 feet = 1.609344 km
- 41 foot = 12 inches = 30.48 cm
5 feet 10 inches=177.8 cm / 1.778 mAvg male height in the US
1 mile=1.609 km / 5,280 ftRunning/road distance
| Unit | In meters | In feet | In inches |
|---|---|---|---|
| 1 millimeter (mm) | 0.001 m | 0.00328 ft | 0.03937 in |
| 1 centimeter (cm) | 0.01 m | 0.03281 ft | 0.3937 in |
| 1 meter (m) | 1 m | 3.2808 ft | 39.37 in |
| 1 kilometer (km) | 1,000 m | 3,280.8 ft | 0.6214 mi |
| 1 inch (in) | 0.0254 m | 0.0833 ft | 1 in |
| 1 foot (ft) | 0.3048 m | 1 ft | 12 in |
| 1 mile (mi) | 1,609.3 m | 5,280 ft | 63,360 in |
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Fun Fact
The meter was originally defined in 1793 as one ten-millionth of the distance from the North Pole to the equator along the Paris meridian. Today it's defined by the speed of light: the distance light travels in 1/299,792,458 of a second.
References
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