Speed converter
Convert speeds and running paces between metric, imperial and nautical units.
100 Kilometres per hour ≈ 62.13711922 Miles per hour
Exact factorRounded for display to about 10 significant digits.
All units
Paper tape
ConvertThemAll
- Your conversions print here.
0 lines · kept on this device only
About these units
Speed is distance travelled per unit of time. The SI unit is the metre per second; road speeds are given in kilometres per hour in most countries and in miles per hour in the United States and the United Kingdom. Ships and aircraft use knots, one nautical mile per hour.
Runners often use pace instead, the time taken for one kilometre or one mile. Pace is the inverse of speed: the faster you go, the smaller the number.
Popular conversions
- Kilometres per hour to Miles per hour
- Miles per hour to Kilometres per hour
- Metres per second to Kilometres per hour
- Kilometres per hour to Metres per second
- Knots to Kilometres per hour
- Kilometres per hour to Knots
- Knots to Miles per hour
- Miles per hour to Knots
- Metres per second to Miles per hour
- Miles per hour to Metres per second
- Feet per second to Miles per hour
- Miles per hour to Feet per second
- Feet per second to Metres per second
- Metres per second to Feet per second
- Kilometres per hour to Feet per second
- Feet per second to Kilometres per hour
- Minutes per kilometre to Minutes per mile
- Minutes per mile to Minutes per kilometre
- Kilometres per hour to Minutes per kilometre
- Minutes per kilometre to Kilometres per hour
- Miles per hour to Minutes per mile
- Minutes per mile to Miles per hour
- Kilometres per second to Kilometres per hour
- Speed of light to Kilometres per hour
- Knots to Metres per second
- Metres per second to Knots
Questions people ask
How do I convert km/h to mph?
Divide by 1.609344, the number of kilometres in a mile. 100 km/h is about 62.14 mph.
How fast is a knot?
One knot is one nautical mile per hour: exactly 1.852 km/h, or about 1.15078 mph.
Why is Mach not listed?
Mach is a multiple of the local speed of sound, which changes with air temperature, so it has no fixed factor.
Factors checked 19 October 2026.