Multiply metres per second by 3.6 to get kilometres per hour. Physics problems use m/s; road speeds use km/h.
How to use the m/s to km/h Converter
- Type the number of metres per second into the Metres per second field. Decimals such as 5 are fine.
- Read the answer in Kilometres per hour. It updates as you type, with no button to press. The same amount is also shown in mph, kn.
- To go from kilometres per hour back to metres per second, type into the Kilometres per hour field instead. Every field also has a unit menu with all 10 speed units, for example mph, ft/s, kn, km/s, yd/s, ft/min, Mach.
Results update as you type, and everything is calculated in your browser.
How it works
Both units measure speed, so they are always in the same ratio: one metre per second equals 3.6 kilometres per hour. The calculator multiplies the number of metres per second you type by 3.6 to give kilometres per hour, and when you type into the kilometres per hour field it divides by the same factor to give metres per second. Because the ratio never changes, doubling the metres per second always doubles the kilometres per hour, for example 20 m/s is 72 km/h.
How to convert metres per second to kilometres per hour
- Write down the value in metres per second, for example 10 m/s.
- Multiply by the conversion factor 3.6 (because 1 metre per second = 3.6 km/h).
- 10 × 3.6 = 36 km/h.
- To go back from kilometres per hour to metres per second, divide by 3.6, or multiply by 0.27777778.
m/s to km/h conversion table
| Metres per second | Kilometres per hour | Kilometres per hour | Metres per second |
|---|---|---|---|
| 1 m/s | 3.6 km/h | 1 km/h | 0.27777778 m/s |
| 2 m/s | 7.2 km/h | 2 km/h | 0.55555556 m/s |
| 5 m/s | 18 km/h | 5 km/h | 1.3888889 m/s |
| 10 m/s | 36 km/h | 10 km/h | 2.7777778 m/s |
| 15 m/s | 54 km/h | 20 km/h | 5.5555556 m/s |
| 20 m/s | 72 km/h | 50 km/h | 13.888889 m/s |
| 25 m/s | 90 km/h | 100 km/h | 27.777778 m/s |
| 30 m/s | 108 km/h | 1,000 km/h | 277.77778 m/s |
| 50 m/s | 180 km/h | ||
| 100 m/s | 360 km/h | ||
| 343 m/s | 1,234.8 km/h |
Speed units explained
- Metre per second (m/s)
- Metres per second is the SI unit of speed, used in physics, wind measurement and athletics. Walking is about 1.4 m/s and Usain Bolt’s top speed about 12.4 m/s.
- Kilometre per hour (km/h)
- Kilometres per hour is the unit on road signs and speedometers in most countries. 100 km/h is about 62 mph.
Common mistakes to avoid
Confusing knots with mph, and Mbps internet speeds (bits) with MB/s download speeds (bytes).
Formula
1 m/s = 3.6 km/h
1 km/h = 0.27777778 m/s
km/h = m/s × 3.6
Worked example
Inputs: Metres per second: 10 m/s.
Results: Kilometres per hour = 36 km/h; Miles per hour = 22.36936292 mph; Knots = 19.43844492 kn.
Frequently asked questions
How many km/h is 10 m/s?
36 km/h.
Why 3.6?
1 m/s × 3,600 s/h ÷ 1,000 m/km = 3.6 km/h.
How do I convert metres per second to kilometres per hour?
Multiply the number of metres per second by 3.6. For example, 10 m/s × 3.6 = 36 km/h.
How do I convert kilometres per hour back to metres per second?
Divide by 3.6 (or multiply by 0.27777778), or simply type the value into the kilometres per hour field above.
What is 100 m/s in kilometres per hour?
100 m/s = 360 km/h.
What is 5 m/s in kilometres per hour?
5 m/s = 18 km/h.
Is the metres per second to kilometres per hour conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 m/s = 3.6 km/h exactly, so the only difference you may see is rounding in the last displayed digit.