Convert Speed
Convert speeds, for example mph on American roads or knots on the lake and in the air.
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1 km/h = 0.621371 mph
In all units
- kilometres per hour
- 1 km/h
- metres per second
- 0.277778 m/s
- miles per hour
- 0.621371 mph
- knots
- 0.539957 kn
- feet per second
- 0.911344 ft/s
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”.