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.
- To convert the other way, type into Kilometres per hour and the metres per second are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only m/s ⇄ km/h. Need a different unit? Use the general speed converter, where you can choose any “from” and “to” unit.
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. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
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 |
What is a metre per second?
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.
What is a kilometre per hour?
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/h1 km/h = 0.27777778 m/skm/h = m/s × 3.6Worked example
Inputs — Metres per second: 10 m/s.
Results — Kilometres per hour = 36 km/h.
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 this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between metres per second and kilometres per hour. To pick any speed unit, use the general speed converter linked under Related calculators.
What formula does the m/s to km/h Converter use?
1 m/s = 3.6 km/h.