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Mile Per Hour Converters

Convert mph to and from km/h, m/s, feet per second, knots and Mach.

What this tool does

Convert mph to and from km/h, m/s, feet per second, knots and Mach. Type an amount in miles per hour, choose the units, and the tool converts it to kilometers per hour. It offers 6 speed units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Mile per hour, Kilometer per hour, Meter per second, Foot per second, Knot, Mach (standard atmosphere, sea level, 15 °C). Starts as Mile per hour.
  • To: Choose one of the same 6 units as "From". Starts as Kilometer 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 miles per hour to kilometers per hour:

  • 1 mph = 1.609344 km/h
  • 5 mph = 8.04672 km/h
  • 10 mph = 16.09344 km/h
  • 50 mph = 80.4672 km/h
  • 100 mph = 160.9344 km/h

Multiply the number of miles per hour by 1.609344 to get kilometers per hour. Both units are exact definitions, so 1.609344 is the exact factor: 1 mph = 1.609344 km/h.

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

Limitations

  • The mile here is the international (statute) mile. Nautical miles are covered by the knot.
  • 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 km/h is 1 mph?
A: One mile per hour is 1.609344 km/h, using the international mile of 1,609.344 meters.
Q: How many knots is 60 mph?
A: Sixty miles per hour is 52.1386 knots.
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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