Meters per Second to Kilometers per Hour Converter (m/s to km/h)
1 m/s = 3.6 km/h exactly. Convert meters per second to km/h for wind forecasts, typhoon reports and physics answers, with m/s and km/h charts.
Kilometer per Hour (km/h) = Meter per Second (m/s) × 3.6
Meter per Second (m/s): The metre per second is the SI unit of speed: an object at 1 m/s covers one metre every second. It is used in physics and engineering and for wind speeds in weather forecasts.
Kilometer per Hour (km/h): The kilometre per hour is the speed unit on road signs and speedometers in most of the world. Because 1 km is 1000 m and 1 hour is 3600 s, 1 km/h is exactly 5/18 m/s (about 0.2778 m/s).
| Meter per Second (m/s) | Kilometer per Hour (km/h) |
|---|---|
| 1 | 3.6 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
Weather services in Korea, Japan, the Nordic countries and Russia give wind speed in meters per second, while visitors and forecasts elsewhere think in kilometers per hour. Physics and engineering work in m/s too, as it is the SI unit. One meter per second is exactly 3.6 km/h, since an hour has 3,600 seconds and a kilometer 1,000 meters.
Typhoon warnings show why it helps to convert: in its forecasts for Japan, the Japan Meteorological Agency calls a tropical cyclone a typhoon (taifū) from 17.2 m/s of sustained wind, which sounds mild until it becomes about 62 km/h, and a 40 m/s gust is 144 km/h. Turning a physics answer into km/h also makes it easier to judge: a ball thrown at 30 m/s moves at 108 km/h.
How to use this tool
- Type a value in the Meter per Second box to see it in kilometers per hour, or type in the Kilometer per Hour box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Speed converter.
Formula
Kilometer per Hour (km/h) = Meter per Second (m/s) × 3.6
Meter per Second (m/s) = Kilometer per Hour (km/h) × 0.277777777778
Both factors come from exact definitions: 1 kilometer per hour = 0.277777777778 meters per second and 1 meter per second = 3.6 kilometers per hour (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
17.2 m/s × 3.6 = 61.92 km/h
90 km/h × 0.277777777778 = 25 m/s
Meter per Second to Kilometer per Hour chart
Common values from meters per second to kilometers per hour, rounded to four decimal places.
| Meter per Second (m/s) | Kilometer per Hour (km/h) |
|---|---|
| 0.5 | 1.8 |
| 1 | 3.6 |
| 1.4 | 5.04 |
| 2 | 7.2 |
| 3 | 10.8 |
| 4 | 14.4 |
| 5 | 18 |
| 8 | 28.8 |
| 10 | 36 |
| 12 | 43.2 |
| 15 | 54 |
| 17.2 | 61.92 |
| 20 | 72 |
| 25 | 90 |
| 30 | 108 |
| 33 | 118.8 |
| 40 | 144 |
| 44 | 158.4 |
| 50 | 180 |
| 54 | 194.4 |
| 100 | 360 |
| 340.294 | 1,225.06 |
Kilometer per Hour to Meter per Second chart
The reverse direction for values people often look up.
| Kilometer per Hour (km/h) | Meter per Second (m/s) |
|---|---|
| 5 | 1.3889 |
| 10 | 2.7778 |
| 18 | 5 |
| 20 | 5.5556 |
| 36 | 10 |
| 50 | 13.8889 |
| 54 | 15 |
| 72 | 20 |
| 90 | 25 |
| 100 | 27.7778 |
| 120 | 33.3333 |
| 144 | 40 |
| 200 | 55.5556 |
| 300 | 83.3333 |
Speeds usually given in meters per second
| Speed | Meter per Second (m/s) | Kilometer per Hour (km/h) |
|---|---|---|
| Comfortable walking pace, about | 1.4 | 5.04 |
| Usain Bolt's 9.58 s 100 m (2009), average | 10.4384 | 37.5783 |
| Typhoon (taifū) in Japanese forecasts, from | 17.2 | 61.92 |
| Speed of sound in air at 20 °C, about | 343 | 1,234.8 |
| Earth's rotation at the equator, about | 465 | 1,674 |
| International Space Station in orbit, about | 7,660 | 27,576 |
Quick mental estimate
Multiply by 4, then take away a tenth of the result: 25 m/s → 100 − 10 = 90 km/h. Because 4 × 0.9 is exactly 3.6, this shortcut gives the exact answer, not an estimate.
Use the converter or the charts when the exact figure matters.
The two units
Meter per Second (m/s): The metre per second is the SI unit of speed: an object at 1 m/s covers one metre every second. It is used in physics and engineering and for wind speeds in weather forecasts.
Kilometer per Hour (km/h): The kilometre per hour is the speed unit on road signs and speedometers in most of the world. Because 1 km is 1000 m and 1 hour is 3600 s, 1 km/h is exactly 5/18 m/s (about 0.2778 m/s).
Frequently asked questions
Is 10 m/s a strong wind?
10 m/s is 36 km/h, force 5 on the Beaufort scale: a fresh breeze that sways small trees and raises many whitecaps. From about 17.5 m/s, or 63 km/h, the wind reaches gale force.
Why do Korean and Japanese forecasts give wind in m/s?
Both national weather services report wind in meters per second, the SI unit, as do the Nordic countries. Typhoon intensity classes in Korea and Japan are set in m/s as well.
How fast is the speed of sound in km/h?
In air at 20 °C, sound travels at about 343 m/s, roughly 1,235 km/h. The figure changes with temperature, which is one reason fast aircraft report their speed as a Mach number.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/meters-per-second-to-kilometers-per-hour-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Meters per Second to Kilometers per Hour Converter (m/s to km/h). https://kakao.mobile/tools/meters-per-second-to-kilometers-per-hour-converter/
“Meters per Second to Kilometers per Hour Converter (m/s to km/h).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/meters-per-second-to-kilometers-per-hour-converter/.
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