Speed converter
Convert km/h to m/s, miles per hour or knots – useful for driving abroad, sport and meteorology.
100 km/h=62.137119 mph
Conversion to all units
| metre per second (m/s) | 27.777778 |
| mile per hour (mph) | 62.137119 |
| knot (kn) | 53.99568 |
How speed conversion works
The converter calculates through kilometres per hour. Between km/h and m/s the factor is 3.6 – multiply a speed in m/s by 3.6 to get km/h. That is why 10 m/s corresponds to exactly 36 km/h.
Miles per hour (mph) are used in the UK and US: 1 mph = 1.609 km/h, so the 70 mph motorway limit corresponds to roughly 113 km/h. A knot is one nautical mile per hour, i.e. 1.852 km/h – used in aviation and at sea.
Conversion examples
| Value | Result |
|---|---|
| 100 km/h | 62.1371 mph |
| 60 mph | 96.5606 km/h |
| 10 m/s | 36 km/h |
| 20 kn | 37.04 km/h |
| 1 m/s | 2.23694 mph |
Frequently asked questions
How do I convert km/h to m/s?
Divide the value by 3.6. For example, 90 km/h = 25 m/s. The other way: m/s × 3.6 = km/h.
How many km/h is 100 mph?
100 mph is 160.93 km/h. For a quick estimate, multiply miles per hour by 1.6.
What is a knot in km/h?
A knot (kn) is one nautical mile per hour = 1.852 km/h. A ship sailing at 20 knots moves at roughly 37 km/h.
Why does aviation use knots?
The nautical mile corresponds to one minute of arc of latitude, which simplifies navigation using charts and coordinates. That is why aviation adopted it too.
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Last updated: 15 July 2026