m/s to km/h converter
m/s to km/h is one multiplication: × 3.6, because 1 m/s covers 3,600 m = 3.6 km in an hour. Type a speed and the km/h appear as you type, with mph and knots below; km/h to m/s works in the same box.
Example: Speed 10 · Direction: m/s to km/h → Answer: 10 m/s = 36 km/h. Source: NIST Special Publication 811, Appendix B.8: kilometer per hour = 2.777 778 E−01 m/s, mile per hour = 4.4704 E−01 m/s (exact), knot = 5.144 444 E−01 m/s (read 15.10.2026). Updated: .
How it is calculated
How to convert m/s to km/h
km/h = m/s × 3.6 and m/s = km/h ÷ 3.6. An hour has 3,600 seconds and a kilometer 1,000 meters, so 1 m/s = 3,600 m per hour = 3.6 km/h. Ten meters per second is 36 km/h, and 100 km/h is 27.7778 m/s. The factor is exact, so the converter only rounds for display.
m/s to km/h chart
| m/s | km/h |
|---|---|
| 1 | 3.6 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 30 | 108 |
Shortcut 18/5 and 5/18
In school physics the factor is often written as a fraction: multiply m/s by 18/5 for km/h and km/h by 5/18 for m/s. 18 ÷ 5 = 3.6, so it is the same rule. Example: 72 km/h × 5/18 = 20 m/s. Wind speeds from weather stations are usually in m/s, road speeds in km/h, which is why this conversion comes up so often; the Beaufort scale lists both.
mph and knots
One mile per hour is exactly 0.44704 m/s and one knot is 1,852 m per hour, 0.5144 m/s. So 1 m/s = 2.2369 mph = 1.9438 knots, and 10 m/s = 22.3694 mph. To convert km/h to mph directly use km/h to mph; to work out speed from distance and time, see the speed distance time calculator.
Frequently asked questions
How many km/h is 1 m/s?
1 m/s = 3.6 km/h exactly.
How do I convert m/s to km/h?
Multiply by 3.6 (or by 18/5): 10 m/s × 3.6 = 36 km/h.
How do I convert km/h to m/s?
Divide by 3.6 (or multiply by 5/18): 72 km/h ÷ 3.6 = 20 m/s.
What is 100 km/h in m/s?
100 km/h = 27.7778 m/s.
How many mph is 1 m/s?
1 m/s = 2.2369 mph, because 1 mph is exactly 0.44704 m/s.
Sources and legal basis
As of: · Editorial policy
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