Speed Converter
Convert meters per second, kilometers per hour, miles per hour and knots instantly.
Enter a speed and choose the unit it is measured in, then select the target unit. The result and the conversion rate update live.
Conversions are routed through meters per second: 1 km/h = 1/3.6 m/s, 1 mph = 0.44704 m/s, and 1 knot = 0.514444 m/s. These factors are exact or internationally defined.
Click the swap button to reverse the direction, for example from mph to km/h and back.
Frequently asked questions
How do you convert km/h to m/s?
Divide by 3.6. For example, 72 km/h equals 20 m/s. The converter uses the exact factor 1/3.6.
How many mph is one knot?
One knot is approximately 1.15078 mph. The converter uses the exact definition 1 knot = 0.514444 m/s.
What is the conversion from mph to km/h?
One mph equals exactly 1.609344 km/h. Multiply mph by 1.609344 to get km/h.