Meters per second to Kilometers per hour

About Meters per second and Kilometers per hour

Meters per second (m/s): The SI derived unit for speed (distance / time); 1 m/s = 3.6 km/h. Common uses: Physics and engineering calculations, wind speed in meteorology, sports analytics (sprint speeds), and any context where speed feeds into other equations.

Kilometers per hour (km/h): A practical unit derived from the kilometer (defined via the meter) and the hour (60 × 60 seconds). Common uses: Vehicle speed limits worldwide except in the US and a few other countries, train and aircraft cruise speeds (in metric contexts), and weather wind speeds.

How the conversion works

Speed is distance per unit time. 1 m/s = 3.6 km/h. 1 mph = 1.609344 km/h. 1 knot = 1.852 km/h (one nautical mile per hour).

The exact relationship is kilometers per hour = meters per second × 3.59999712e+0, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.

When this conversion matters

Converting between meters per second and kilometers per hour comes up wherever speed measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.