Speed Converter
Convert between different units of speed and velocity.
Result
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Enter speed and select units
km/h
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mph
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m/s
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Knots
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Speed Conversions
Common Conversion Factors
1 km/h = 0.621371 mph
1 mph = 1.60934 km/h
1 m/s = 3.6 km/h
1 knot = 1.852 km/h
1 mph = 1.60934 km/h
1 m/s = 3.6 km/h
1 knot = 1.852 km/h
Reference Speeds
| Speed | km/h | mph | m/s |
|---|---|---|---|
| Walking | 5 | 3.1 | 1.4 |
| Running (jog) | 10 | 6.2 | 2.8 |
| Highway speed | 100 | 62 | 27.8 |
| Speed of sound | 1235 | 767 | 343 |
| Speed of light | 1.08B | 670.6M | 299792458 |
About Mach Number
Mach number is the ratio of speed to the speed of sound. Mach 1 = speed of sound (varies with altitude/temperature). A typical commercial jet flies at Mach 0.78-0.85.