Convert between meters per second (m/s) and kilometers per hour (km/h) in either direction.
How it works
Since there are 3,600 seconds in an hour and 1,000 meters in a kilometer, 1 m/s = 3.6 km/h exactly. Enter a value in either field and the other updates instantly.
What this does not include
This is a plain speed-unit conversion. It doesn’t distinguish between average and instantaneous speed, or between speed and velocity (which includes direction).
How to use this calculator
- Enter a value in m/s or km/h.
- The other field updates automatically.
Why is m/s the standard unit in physics?
The meter and second are both SI base units, so m/s is the natural, “coherent” SI unit for speed — no conversion factor needed within physics equations, unlike km/h or mph.
How fast is 100 km/h in m/s?
About 27.78 m/s — dividing 100 by 3.6 gives that figure, useful for physics problems that need speed in SI base units.
Is this the same conversion used for wind speed?
Yes, when wind speed is reported in m/s (common in scientific and international contexts) rather than km/h, mph, or knots — this is the direct conversion between those two specific units.
