The Speed Converter converts between the common units of speed — kilometres per hour, miles per hour, metres per second, feet per second, and knots. Enter a value, choose the units, and the result appears instantly, with a table showing the speed in every unit.
It is useful for driving, sport, aviation, sailing, and physics. Everything is calculated in your browser.
How to convert speed
- Enter the speed value.
- Select the unit to convert from and the unit to convert to.
- Read the result instantly, or press Swap to reverse the direction.
- See the speed in every unit in the table below.
Common speed conversions
- 1 km/h = 0.621371 mph
- 1 mph = 1.60934 km/h
- 1 m/s = 3.6 km/h
- 1 knot = 1.852 km/h
Frequently Asked Questions
How do I convert km/h to mph?
Multiply the km/h value by 0.621371, or just enter the value and select km/h and mph here. For example, 100 km/h is about 62.14 mph.
How do I convert m/s to km/h?
Multiply metres per second by 3.6. For example, 10 m/s equals 36 km/h.
What is a knot?
A knot is one nautical mile per hour, used in sailing and aviation. One knot equals 1.852 km/h or about 1.15078 mph.