Quick Answer: Meters per Second to Kilometers per Hour
One meter per second equals 3.6 kilometers per hour (1 m/s = 3.6 km/h).
Conversely, 1 km/h ≈ 0.2778 m/s.
Formula: km/h = m/s × 3.6
Worked examples
- 1 m/s = 3.6 km/h
- 2 m/s = 7.2 km/h
- 5 m/s = 18 km/h
Method and limitations
Multiply meters per second by 3.6. There are 3,600 seconds in an hour and 1,000 m in a km, so 1 m/s = 3,600 m/h = 3.6 km/h exactly. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
Multiply meters per second by 3.6. There are 3,600 seconds in an hour and 1,000 m in a km, so 1 m/s = 3,600 m/h = 3.6 km/h exactly.
Complete Guide to Meters per Second to Kilometers per Hour Conversion
What is a meter per second?
Meters per second (m/s) is the SI unit of speed: distance in meters per second.
What is a kilometer per hour?
Kilometers per hour (km/h) is the same physical speed expressed per hour, in kilometers.
How the Conversion Works
km/h = m/s × 3.6, exact.
Step-by-Step Conversion Guide
Follow these steps to convert meters per second to kilometers per hour manually:
Start with your value in meters per second
Example: You want to convert 5 m/s
Apply the conversion formula
Use the formula: km/h = m/s × 3.6
Calculate the result
5 m/s = 18 km/h
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
Multiply by 4 and take off 10%: 15 m/s ≈ 60 − 6 = 54 km/h (exact).
Common Conversions
| Meters per Second (m/s) | Kilometers per Hour (km/h) | Kilometers per Hour → Meters per Second |
|---|---|---|
| 1 m/s | 3.6 | 1 km/h = 0.277778 m/s |
| 2 m/s | 7.2 | 2 km/h = 0.555556 m/s |
| 5 m/s | 18 | 5 km/h = 1.38889 m/s |
| 10 m/s | 36 | 10 km/h = 2.77778 m/s |
| 15 m/s | 54 | 15 km/h = 4.16667 m/s |
| 20 m/s | 72 | 20 km/h = 5.55556 m/s |
| 30 m/s | 108 | 30 km/h = 8.33333 m/s |
| 50 m/s | 180 | 50 km/h = 13.8889 m/s |
| 100 m/s | 360 | 100 km/h = 27.7778 m/s |
| 343 m/s | 1,234.8 | 343 km/h = 95.2778 m/s |
Did You Know?
The speed of light is exactly 299,792,458 meters per second — one of the few physical constants defined to be exact by international agreement.
Popular Meters per Second to Kilometers per Hour Conversions
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When You'll Need This Conversion
Wind speed in forecasts
Forecast data often gives wind in m/s; 8 m/s is 28.8 km/h.
Physics and engineering results
A calculated speed of 25 m/s expressed for readers used to km/h is 90 km/h.
Common Mistakes to Avoid
Dividing by 3.6
That converts the other way.
m/s → km/h: × 3.6.
Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.