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MPH to km/h Converter

Convert miles per hour to kilometers per hour, with m/s, knots and feet per second shown alongside.

What this tool does

Convert miles per hour to kilometers per hour, with m/s, knots and feet per second shown alongside. Type an amount in miles per hour, choose the units, and the tool converts it to kilometers per hour. It offers 5 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, Knot, Foot per second. Starts as Mile per hour.
  • To: Choose one of the same 5 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

  • Converts speed units only. It does not work out speed from a distance and a time.

FAQs

Q: How do I convert mph to km/h?
A: Multiply by 1.609344, which is exact for the international mile. For example, 60 mph is 96.56064 km/h.
Q: What is 100 mph in km/h?
A: One hundred mph is 160.9344 km/h.
Q: Can I convert the other way, from km/h to mph?
A: Yes. Choose km/h in the From box and mph in the To box.

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