Length Converter
Convert between length units
mm
cm
m
km
in
ft
yd
mi
Quick Reference
1 meter =
100 cm
1 kilometer =
1000 m
1 foot =
12 inches
1 mile =
5280 feet
Length Units
Metric System
Based on powers of 10. Used worldwide except in the US, Liberia, and Myanmar.
- Millimeter (mm) - 1/1000 of a meter
- Centimeter (cm) - 1/100 of a meter
- Meter (m) - Base unit
- Kilometer (km) - 1000 meters
Imperial System
Traditional units used primarily in the United States.
- Inch (in) - Base unit
- Foot (ft) - 12 inches
- Yard (yd) - 3 feet
- Mile (mi) - 5280 feet
FAQ
Why does the US use imperial units?
Historical reasons. The US inherited the imperial system from Britain before the metric system was widely adopted.
How accurate are these conversions?
Very accurate. The conversion factors are based on internationally agreed standards. Results are shown to 6 decimal places for precision.