Kilometers per Hour to Meters per Second Converter

About the km/h to m/s calculation

One kilometer per hour is exactly 0.277778 meters per second, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The speed-limit unit across most of the world. The SI unit of speed, used in physics and in wind-speed reporting.

Formula

m/s = km/h × 0.277778

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

Worked example

To convert 100 km/h, multiply by 0.277778: 100 × 0.277778 = 27.7778 m/s.

Frequently asked questions

How many meters per second are in a kilometer per hour?

There are 0.277778 meters per second in one kilometer per hour. To convert any amount, multiply the number of kilometers per hour by 0.277778.

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

Divide instead of multiplying, or equivalently multiply by 3.6. One meter per second is 3.6 kilometers per hour.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between kilometers per hour and meters per second 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?

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

Sources

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