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Convert m/s to km/h
1 m/s = 3.6 km/h
Type a value in metres per second and the answer in kilometres per hour appears as you go. The conversion is exactly 3.6 km/h to the metre per second, and it happens on your own machine — this page asks nothing of a server once it has loaded.
Where it runs
In your browser. The number you type is never part of a request.
Exact by definition
1 m/s is exactly 3.6 km/h — a definition, not a rounded factor.
Answers as you type
No button, no wait. The worked answer is already on the page before any script runs.
Metre per second and Kilometre per hour
Metres per second is the SI unit and the one physics is done in, which is why it turns up in wind readings and in almost nothing a driver would look at.
Kilometres per hour is the speed limit almost everywhere in the world. Dividing by 3.6 gives metres per second, because there are 3,600 seconds in an hour and 1,000 metres in a kilometre.
metres per second to kilometres per hour in practice
343 m/s is 1235 km/h
— the speed of sound in air at room temperature.
10 m/s is 36 km/h
— a world-class sprinter at full speed.
metres per second to kilometres per hour at a glance
| m/s | km/h |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 50 | 180 |
| 100 | 360 |
Every figure here is computed from the same definition the calculator uses, so the table cannot drift away from the answer above it.
Convert m/s to km/h: common questions
How many kilometres per hour are in a metre per second?
Exactly 3.6. One metre per second is 3.6 kilometres per hour, and the box above will do it for any figure you type.
Is this conversion exact, or rounded?
The ratio is exact. It is not a rounded constant typed into a table: it is derived from the definitions of the two units, so it agrees with any other correct converter to as many digits as you care to compare.
Why does another converter show a slightly different number?
Almost always rounding rather than disagreement. Many converters cut the answer to two or four decimals, and some carry a factor that was rounded before the multiplication rather than after. The figures here are computed from the exact definitions and only rounded on the way to the screen.
Where these figures come from
The claims this page makes about speed units are checkable, and these are the documents that settle them.
How this page works
The factor is a constant in the page and the arithmetic is four operations, so nothing is sent anywhere and nothing needs to be. The number you type never leaves the browser — there is no request for it to travel in.