Km/h to mph
Unit conversionHow many miles per hour is 100 km/h?
Divide km/h by 1.609344 to get mph, or enter any speed to convert it.
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Result
62.14 mph
100 kilometres per hour is about 62.14 miles per hour
- The other way round: 1 mph = 1.609344 km/h.
In all units
- Metres per second
- 27.78 m/s
- Kilometres per hour
- 100 km/h
- Miles per hour
- 62.14 mph
- Knots
- 54 kt
- Feet per minute
- 5,468 ft/min
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Divide km/h by 1.609344 to get mph, or enter any speed to convert it.
How to use
- Type the speed you want to convert.
- Choose the units to convert from and to. Use the swap button to flip them.
How it works
Every unit is converted through metres per second using exact definitions: 1 km/h is 1,000 m per 3,600 s, a mile is exactly 1,609.344 m so 1 mph is 0.44704 m/s, and a knot is one nautical mile (exactly 1,852 m) per hour. So 100 km/h is 100 ÷ 1.609344 ≈ 62.14 mph, and 1 knot is exactly 1.852 km/h.
The mile comes from NIST Special Publication 811 and the nautical mile from the BIPM SI Brochure. Feet per minute (0.3048 m per 60 s) is the unit pilots use for climb and descent.
Mach is not offered. A Mach number is a fraction of the speed of sound, which changes with air temperature and altitude, so there is no single factor to convert it by.
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