Speed Converter
Convert between mph, km/h, m/s, knots and ft/s.
Speed units
Road speeds use miles per hour in the US and UK and kilometres per hour almost everywhere else. Scientists use metres per second, and ships and aircraft use knots, where 1 knot is one nautical mile per hour.
Handy conversions
- 1 mph = 1.609344 km/h
- 1 m/s = 3.6 km/h
- 1 knot = 1.852 km/h = 1.15078 mph
Example
60 mph is about 96.56 km/h. A quick rule for km/h to mph is to multiply by 0.62.
Frequently asked questions
How do I convert km/h to m/s?
Divide by 3.6.
Why do ships use knots?
A knot matches one nautical mile per hour, and a nautical mile relates to one minute of latitude, which suits navigation.
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