M/S to KM/H Converter
Convert metres per second to kilometres per hour — multiply by 3.6. Results update as you type; exact factors shown.
One metre per second is 3.6 kilometres per hour — see the exact factor, not a rounded rule of thumb.
How the m/s to km/h converter works
Speeds convert through metres per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common speed conversions
| From | To | Units |
|---|---|---|
| 1 m/s | 3.6 km/h | metre per second to kilometres per hour |
| 2 m/s | 7.2 km/h | metres per second to kilometres per hour |
| 5 m/s | 18 km/h | metres per second to kilometres per hour |
| 10 m/s | 36 km/h | metres per second to kilometres per hour |
| 15 m/s | 54 km/h | metres per second to kilometres per hour |
| 20 m/s | 72 km/h | metres per second to kilometres per hour |
| 25 m/s | 90 km/h | metres per second to kilometres per hour |
| 27.8 m/s | 100.08 km/h | metres per second to kilometres per hour |
| 30 m/s | 108 km/h | metres per second to kilometres per hour |
| 50 m/s | 180 km/h | metres per second to kilometres per hour |
| 100 m/s | 360 km/h | metres per second to kilometres per hour |
| 343 m/s | 1,234.8 km/h | metres per second to kilometres per hour |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metre per seconds |
|---|---|---|
| metre per second | m/s | 1 metre per second |
| kilometre per hour | km/h | 0.2777777778 metre per second |
| mile per hour | mph | 0.44704 metre per second |
| knot | kn | 0.5144444444 metre per second |
| foot per second | ft/s | 0.3048 metre per second |
| Mach (sea level, 15 °C) | Ma | 340.29 metre per second |
FAQFrequently asked questions about speed conversion
How do I convert m/s to km/h?
Multiply by 3.6.
What is 10 m/s in km/h?
36 km/h.
How fast is the speed of sound?
343 m/s at 20°C, which is 1,235 km/h.
What is a comfortable walking speed?
About 1.4 m/s, which is 5 km/h.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.