Speed
Metres per second and kilometres per hour – the table where everything is times 3.6, plus the exact mph and knot factors. Edit, print and share.
The speed table links metres per second to kilometres per hour: multiply by 3.6 to go from m/s to km/h, divide to go back. It also carries the exact mph and knot factors. Made for the classroom and home.
| 1 m/s | = | 3.6 km/h |
|---|---|---|
| 2 m/s | = | 7.2 km/h |
| 5 m/s | = | 18 km/h |
| 10 m/s | = | 36 km/h |
| 25 m/s | = | 90 km/h |
| 100 m/s | = | 360 km/h |
| 1 km/s | = | 1 000 m/s |
| 1 km/s | = | 3 600 km/h |
| 1 mph | = | 1.609344 km/h |
| 1 kn | = | 1.852 km/h |
| 1 ft/s | = | 0.3048 m/s |
How the table works
Every row is a unit conversion: a quantity and unit on the left, the same quantity expressed in another unit on the right. The table is live – drag the handle to reorder, click a row to change the quantity or units, remove rows with the cross and add your own at the bottom.
Everything you change lands in the page address. Copy the link and others open exactly your table – handy when the whole class needs the same sheet. Your changes are also kept in your browser until you reset them, but only there: to share or keep them permanently, the link is what counts.
Print puts the table on a single portrait A4 and Download PDF gives you the same sheet as a file. Print practice sheet gives the table with empty answer cells and name/date lines – the normal printout is the answer key.
Everything is times 3.6
The factor 3.6 comes straight from the definitions: an hour has 3 600 seconds and a kilometre has 1 000 metres, so 3 600 ÷ 1 000 = 3.6. Multiply m/s by 3.6 to get km/h – divide by 3.6 to go the other way.
Common mistake: dividing by 3.6 when you should multiply (or the reverse). Remember: km/h is always the LARGER of the two numbers, since a metre is a small distance and a kilometre a large one.
The table also includes the exact US/international units: 1 mph = 1.609344 km/h and 1 knot = 1.852 km/h, both exact by definition.
Roughly how fast?
- A brisk walk is roughly 1.5 m/s (5.4 km/h).
- A bicycle holds roughly 20 km/h.
- On the motorway, 110 km/h is roughly 30.6 m/s.
- The speed of sound is roughly 340 m/s.
Frequently asked questions
How do I convert m/s to km/h?
Multiply by 3.6. 10 m/s × 3.6 = 36 km/h.
How many km/h is 10 m/s?
36 km/h.
Why 3.6?
3 600 seconds per hour divided by 1 000 metres per kilometre = 3.6.
More tables: Time · Fuel consumption · Prefix ladder · Speed converter