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Speed Unit Conversions

Convert between common speed units like km/h, mph, m/s, knots and feet per second.

What this tool does

Convert between common speed units like km/h, mph, m/s, knots and feet per second. Type an amount in kilometers per hour, choose the units, and the tool converts it to miles per hour. It offers 5 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. Starts as Kilometer per hour.
  • To: Choose one of the same 5 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

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

FAQs

Q: How do I convert km/h to mph?
A: Multiply by about 0.621371. For example, 100 km/h is about 62.1371 mph.
Q: How many km/h is one knot?
A: One knot is exactly 1.852 km/h, because it is one international nautical mile (1,852 meters) per hour.
Q: Can I convert the other way, from mph to km/h?
A: Yes. Choose mph in the From box and km/h in the To box.

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