Speed Converter

Convert between meters per second, kilometers per hour, miles per hour, knots, and more

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Unit Information

Select a unit to see information about it.

Conversion Result

100 km/h = 62.14 mph

Conversion Formula

1 km/h = 0.621371 mph

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Speed Comparison

100 km/h is about the speed of a cheetah at full sprint.

Speed is the rate at which an object covers distance. It's a scalar quantity that refers to "how fast an object is moving" without regard to direction. Speed can be measured in various units depending on the context:

  • Scientific use: Typically meters per second (m/s)
  • Road traffic: Kilometers per hour (km/h) or miles per hour (mph)
  • Aviation: Knots (nautical miles per hour) or Mach number (speed relative to sound)
  • Fitness: Pace (minutes per kilometer or mile) for runners

This tool allows you to convert between all these different units of speed measurement.

What is Mach 1?

Mach 1 is the speed of sound, which varies depending on temperature and atmospheric conditions. At sea level with a temperature of 15°C, Mach 1 is approximately 1,225 km/h (761 mph).

Is mph faster than km/h?

No, 1 mile per hour is equal to about 1.609 kilometers per hour, so km/h is actually a faster unit when comparing the same numeric value.

What are knots?

A knot is a unit of speed equal to one nautical mile per hour (1 knot = 1.852 km/h). It's commonly used in maritime and aviation contexts.

How do I convert pace to speed?

Pace (e.g., minutes per kilometer) is the inverse of speed. To convert pace to speed, divide 60 by the pace value (e.g., 5 min/km = 60/5 = 12 km/h).