Convert Length
Convert lengths between metric and imperial/US units, from millimetres to light years, including nautical miles.
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1 km = 0.621371 mi
In all units
- millimetres
- 1’000’ mm
- centimetres
- 100’ cm
- metres
- 1’000 m
- kilometres
- 1 km
- inches
- 39’370.1 in
- feet
- 3’280.84 ft
- yards
- 1’093.61 yd
- miles
- 0.621371 mi
- nautical miles
- 0.539957 nmi
- light years
- 1.057e-13 ly
Popular conversions
Frequently asked questions
How accurate are the results?
Calculations use the defined conversion factors, e.g. 1 inch = 2.54 cm and 1 pound (lb) = 0.45359237 kg. Six significant digits are shown.
How much is a pound?
The English pound (lb) weighs 453.59 grams. In everyday use in Switzerland and Germany, “ein Pfund” (a pound) often means 500 grams; both are available.
Why does my computer show fewer GB than on the box?
Manufacturers calculate 1 GB = 1000 MB, Windows uses 1024 (actually GiB). Windows therefore shows a 1 TB hard drive as about 931 “GB”.