Convert speed units
km/h to mph, m/s, knots, live.
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About this tool
Kilometres per hour, miles per hour, metres per second, knots and feet per second, converted instantly with the unit rate shown underneath.
Reads foreign speed limits, translates cricket bowling speeds, converts wind speeds from weather reports and makes physics homework less painful. All local, all live.
How it works
- Type an amount and pick your currencies.
- The result updates live as you type.
- Swap the direction with one click.
Frequently asked questions
How do I convert km/h to mph?
Divide by 1.609. So 100 km/h is about 62 mph. Going the other way, multiply miles per hour by 1.609.
What exactly is a knot?
One nautical mile per hour, about 1.852 km/h. Ships and aircraft use knots because nautical miles line up neatly with degrees of latitude.
Why do physics problems use metres per second?
Because it is the SI unit, and formulas for distance, acceleration and energy come out clean in SI. 1 m/s equals exactly 3.6 km/h, a factor worth memorizing.