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Quick reference
Kilometers/hour (km/h) to Miles/hour (mph)
10 km/h
= 6.213711922 mph
30 km/h
= 18.64113577 mph
50 km/h
= 31.06855961 mph
80 km/h
= 49.70969538 mph
100 km/h
= 62.13711922 mph
120 km/h
= 74.56454307 mph
160 km/h
= 99.41939076 mph
200 km/h
= 124.2742384 mph
How speed conversion works
All speed units relate to meters per second (m/s) through fixed multipliers. 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s, 1 knot = 0.51444 m/s.
100 km/h = 62.137 mph = 27.778 m/s
Units in this category
Meters/second m/s
The SI unit of speed. Used in physics, engineering, and scientific calculations.
Kilometers/hour km/h
Kilometers per hour. Standard for road speed limits and vehicle speeds in most countries.
Miles/hour mph
Miles per hour. Used for road speeds in the US, UK, and a few other countries.
Knots kn
Nautical miles per hour. Used in aviation and maritime navigation worldwide.
Frequently asked questions
How do I convert km/h to mph?
Multiply the km/h value by 0.62137. For example, 100 km/h = 62.137 mph.
What is a knot?
A knot equals one nautical mile per hour (1.852 km/h or 1.151 mph). It is the standard speed unit in aviation and maritime navigation.
Why do ships and aircraft use knots?
Knots relate directly to nautical miles, which correspond to degrees of latitude. This makes navigation calculations simpler on charts and maps.
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