Length Unit Converter
( m, cm, in, ft, mi & more )
Convert between meters, centimeters, millimeters, inches, feet, yards, miles, nautical miles, furlongs and more. Enter any value, get instant results.
All length units relative to 1 meter (m).
| Unit Name | Symbol | Value in Meters | Common Usage |
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Understanding Length Measurement Units
Length measures distance between points. The SI base unit is the meter (m). From it, we derive metric units (km, cm, mm) using powers of ten. Imperial/US units like inch, foot, yard, mile have defined metric equivalents.
Metric System
1 kilometer (km) = 1000 m, 1 centimeter (cm) = 0.01 m, 1 millimeter (mm) = 0.001 m. For very small scales, micrometers (µm) and nanometers (nm) are used.
Imperial & US Customary Units
1 inch (in) = 2.54 cm exactly, 1 foot (ft) = 12 in = 0.3048 m, 1 yard (yd) = 3 ft = 0.9144 m, 1 mile (mi) = 1760 yd = 1609.344 m. The nautical mile (nmi) is 1852 m, used in aviation and marine navigation. The furlong (fur) = 220 yd = 201.168 m, still used in horse racing.
How Length Conversion Works
All conversions are based on the meter. For example, to convert feet to meters: multiply by 0.3048. This tool applies the exact factor automatically for every pair of units.
Browse all 76 dedicated conversion pages, organized by unit.
