Quick Answer: To convert m/s to km/h, multiply by 3.6. To convert km/h to m/s, divide by 3.6. For example, 10 m/s = 36 km/h and 100 km/h = 27.78 m/s. The factor is 3.6 because one hour has 3,600 seconds and one kilometer has 1,000 meters.
m/s to km/h Converter
m/s ↔ km/h Formula
Direct Answer: km/h = m/s × 3.6 and m/s = km/h ÷ 3.6 (the same as × 5/18). For mph: mph = m/s × 2.23694.
Example: a sprinter at 10.4 m/s runs 10.4 × 3.6 = 37.4 km/h. Physics problems use m/s because it is the SI unit of speed; road signs use km/h or mph. Convert other units with the speed converter.
m/s to km/h Conversion Chart
| m/s | km/h | mph | Example |
|---|---|---|---|
| 1 m/s | 3.6 | 2.2 | |
| 1.4 m/s | 5 | 3.1 | Walking |
| 2 m/s | 7.2 | 4.5 | |
| 3 m/s | 10.8 | 6.7 | Jogging |
| 5 m/s | 18 | 11.2 | |
| 8 m/s | 28.8 | 17.9 | |
| 10 m/s | 36 | 22.4 | Fast sprint |
| 12.4 m/s | 44.6 | 27.7 | Usain Bolt peak (approx.) |
| 15 m/s | 54 | 33.6 | |
| 20 m/s | 72 | 44.7 | |
| 25 m/s | 90 | 55.9 | |
| 30 m/s | 108 | 67.1 | Highway driving (108 km/h) |
| 40 m/s | 144 | 89.5 | |
| 50 m/s | 180 | 111.8 | |
| 100 m/s | 360 | 223.7 | |
| 250 m/s | 900 | 559.2 | |
| 343 m/s | 1234.8 | 767.3 | Speed of sound in air at 20 °C |
Frequently Asked Questions
How many km/h is 1 m/s?
1 m/s is exactly 3.6 km/h.
How do I convert kmph to mps?
Divide km/h by 3.6. For example, 72 km/h ÷ 3.6 = 20 m/s.
What is 20 m/s in km/h?
20 m/s is 72 km/h (about 44.7 mph).
Why multiply by 3.6?
There are 3,600 seconds in an hour and 1,000 meters in a kilometer: 3,600 ÷ 1,000 = 3.6.