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Kilometer per Hour Converters

Convert km/h to mph, m/s, knots, feet per second and other speed units for travel, sports and weather.

What this tool does

Convert km/h to mph, m/s, knots, feet per second and other speed units for travel, sports and weather. Type an amount in kilometers per hour, choose the units, and the tool converts it to miles per hour. It offers 8 speed units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Kilometer per hour, Mile per hour, Meter per second, Knot, Foot per second, Foot per minute, Mach (standard atmosphere, sea level, 15 °C), Kilometer per second. Starts as Kilometer per hour.
  • To: Choose one of the same 8 units as "From". Starts as Mile per hour.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from kilometers per hour to miles per hour:

  • 1 km/h ≈ 0.621371 mph
  • 5 km/h ≈ 3.106856 mph
  • 10 km/h ≈ 6.213712 mph
  • 50 km/h ≈ 31.06856 mph
  • 100 km/h ≈ 62.137119 mph

Multiply the number of kilometers per hour by about 0.621371 to get miles per hour. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Kilometer per hour: exact by definition. Mile per hour: exact by definition.

Limitations

  • Mach here means the standard-atmosphere sea level value only. At altitude or in warmer or colder air, the same Mach number is a different speed.

FAQs

Q: How many mph is 100 km/h?
A: One hundred kilometers per hour is 62.1371 mph.
Q: How many knots is 100 km/h?
A: One hundred kilometers per hour is 53.9957 knots, using the international nautical mile of 1,852 meters.
Q: Which Mach number does the page use?
A: Mach is shown at sea level in the ISO standard atmosphere at 15 °C, where the speed of sound is 340.294 m/s. The real speed of sound changes with air temperature and altitude.

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