m/s to km/h — convert metres per second to kilometres per hour
Exact 1 × 3.6 = 3.6
1 metre per second in other units
| Kilometres per hour | 3.6 | km/h |
|---|---|---|
| Miles per hour | 2.236936 | mph |
| Feet per second | 3.28084 | ft/s |
| Knots | 1.943844 | kn |
m/s to km/h at a glance
| Metres per second | Kilometres per hour |
|---|---|
| 1 m/s | 3.6 km/h |
| 2 m/s | 7.2 km/h |
| 3 m/s | 10.8 km/h |
| 5 m/s | 18 km/h |
| 10 m/s | 36 km/h |
| 20 m/s | 72 km/h |
| 25 m/s | 90 km/h |
| 50 m/s | 180 km/h |
| 100 m/s | 360 km/h |
| 250 m/s | 900 km/h |
| 500 m/s | 1,800 km/h |
| 1,000 m/s | 3,600 km/h |
How to convert metres per second to kilometres per hour
Multiply by 3.6 — one metre per second is 3.6 kilometres per hour. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 1 × 3.6 = 3.6
In words: about four kilometres per hour.
Questions
How many kilometres per hour are in a metre per second?
One metre per second is 3.6 kilometres per hour. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 1 metre per second in kilometres per hour?
1 metre per second is 3.6 kilometres per hour. The working is 1 × 3.6 = 3.6.
What is a knot?
One nautical mile per hour — and a nautical mile is one minute of latitude, fixed at exactly 1,852 metres. That is the whole point of it: a ship making 10 knots for six hours has covered one degree of latitude, which you can read straight off a chart without converting anything.
Why do sailors and pilots say "knots" and not "knots per hour"?
Because the "per hour" is already inside the word. A knot is a speed, not a distance, so "knots per hour" would be an acceleration. The name comes from the knotted rope once paid out behind a ship and counted against a sand glass.
What's the quick way to convert mph to km/h in my head?
Multiply by 1.6, or add 60%. For the other direction, take away a third and then a little more. Fifty mph is 80 km/h, 60 is 97, 70 is 113 — worth remembering if you drive across a border where the signs change.
Why isn't Mach on this page?
Because it is not a fixed unit. Mach 1 is the local speed of sound, which falls as air gets colder — around 1,235 km/h at sea level but closer to 1,062 km/h in the stratosphere where airliners cruise. A single conversion factor would be wrong nearly everywhere.