Meters per Second to Kilometers per Hour Converter

About the m/s to km/h calculation

One meter per second is exactly 3.6 kilometers per hour, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The SI unit of speed, used in physics and in wind-speed reporting. The speed-limit unit across most of the world.

Formula

km/h = m/s × 3.6

1 m/s = 3.6 km/h
1 km/h = 0.277778 m/s

Worked example

To convert 10 m/s, multiply by 3.6: 10 × 3.6 = 36 km/h.

Frequently asked questions

How many kilometers per hour are in a meter per second?

There are 3.6 kilometers per hour in one meter per second. To convert any amount, multiply the number of meters per second by 3.6.

How do I convert kilometers per hour back to meters per second?

Divide instead of multiplying, or equivalently multiply by 0.277778. One kilometer per hour is 0.277778 meters per second.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between meters per second and kilometers per hour is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Meters per Second: the SI unit of speed, used in physics and in wind-speed reporting. Kilometers per Hour: the speed-limit unit across most of the world.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units