Speed Converter
Convert between km/h, mph, m/s, knots, Mach and more. Free and instant.
100 Kilometers per hour (km/h) =
62.137274
Miles per hour (mph)
Popular Conversions
Real World Speed Reference
Walking Speed
5 km/h
3.1068637 mph
Cycling Speed
20 km/h
12.427455 mph
City Speed Limit
50 km/h
31.068637 mph
Highway Speed
120 km/h
74.564728 mph
Formula 1 Car
350 km/h
217.48046 mph
Bullet Train
320 km/h
198.83928 mph
Commercial Plane
900 km/h
559.23546 mph
Speed of Sound
1235 km/h
767.39533 mph
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Quick Reference — All units for common speeds:
| km/h | mph | m/s | Knots |
|---|---|---|---|
| 10 | 6.2137274 | 2.7777778 | 5.399568 |
| 30 | 18.641182 | 8.3333333 | 16.198704 |
| 50 | 31.068637 | 13.888889 | 26.99784 |
| 80 | 49.709819 | 22.222222 | 43.196544 |
| 100 | 62.137274 | 27.777778 | 53.99568 |
| 120 | 74.564728 | 33.333333 | 64.794816 |
| 200 | 124.27455 | 55.555556 | 107.99136 |
| 300 | 186.41182 | 83.333333 | 161.98704 |
| 500 | 310.68637 | 138.88889 | 269.9784 |
| 1000 | 621.37274 | 277.77778 | 539.9568 |
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Common Questions
How do I convert km/h to mph?
To convert kilometers per hour to miles per hour divide by 1.60934. For example 100 km/h equals 62.14 mph. This is useful when travelling between countries that use different speed units.
What is a knot?
A knot is a unit of speed equal to one nautical mile per hour which is approximately 1.852 km/h or 1.151 mph. Knots are used in aviation and maritime navigation worldwide.
What is Mach speed?
Mach is a unit of speed relative to the speed of sound. Mach 1 is approximately 1235 km/h or 767 mph at sea level. Aircraft that fly faster than Mach 1 are called supersonic.
How fast is the speed of light?
The speed of light is approximately 299,792 km/s or about 1,079,252,849 km/h. It is the fastest possible speed in the universe. Light travels from the Sun to Earth in about 8 minutes.