Speed converter
Convert between kilometers per hour, miles per hour, meters per second, knots and feet per second.
1 kilometer per hour = 0.6213711922 miles per hour
Formula: miles per hour = kilometers per hour ÷ 1.609344
About the units
Speed units explained
Road speeds are given in km/h in most of the world and in mph in the US and UK. Scientists use meters per second, and ships and aircraft use knots, one nautical mile (1,852 m) per hour.
A handy reference: 100 km/h is about 62 mph, and 60 mph is about 97 km/h.
Quick reference
| Unit | Symbol | In meters per second |
|---|---|---|
| meter per second | m/s | 1 m/s |
| kilometer per hour | km/h | 0.2777777778 m/s |
| mile per hour | mph | 0.44704 m/s |
| knot | kn | 0.5144444444 m/s |
| foot per second | ft/s | 0.3048 m/s |
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Frequently asked questions
How do I convert km/h to mph?
Divide by 1.609344, or multiply by about 0.621.
How fast is a knot?
One knot is one nautical mile per hour: 1.852 km/h or about 1.151 mph.