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km/h to mph Converter

Convert kilometers per hour to miles per hour by multiplying by 0.621371. Includes the exact factor, a conversion table, and how to convert car speeds and running paces.

Convert kilometer per hour to mile per hour

Formula

textmph=textkm/htimes0.621371\\text{mph} = \\\\text{km/h} \\\\times 0.621371

Or equivalently:

textmph=fractextkm/h1.609344\\text{mph} = \\\\frac{\\text{km/h}}{1.609344}

Worked example

Convert 120 km/h to mph:

textmph=120times0.621371=74.5645\\text{mph} = 120 \\\\times 0.621371 = 74.5645

Result: 74.56 mph

How to use

  1. Enter the speed in kilometers per hour
  2. Click "Calculate" to see the equivalent in miles per hour

Common conversions

| km/h | mph | |------|-----| | 50 | 31.07 | | 80 | 49.71 | | 100 | 62.14 | | 120 | 74.56 | | 150 | 93.21 | | 200 | 124.27 |

Common use cases

  • Car speedometer conversions
  • International travel planning
  • Sports speed measurements
  • Engineering and automotive applications

FAQ

What is the exact conversion factor? 1 mile = 1.609344 kilometers exactly.

Can I use this for aviation? Yes, but aviation typically uses knots (nautical miles per hour).

How accurate is this conversion? The conversion is exact based on the international mile definition.

Is mph used in the US? Yes, the US and UK use mph for road speed limits.

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