The speed in kilometers per hour is equal to the speed in miles per hour multiplied by 1.609344. Since one mile per hour is equal to 1.609344 kilometers per hour,<1> that's the conversion ratio used in the formula.

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**For example,** here's how to convert 5 miles per hour to kilometers per hour using the formula above.

5 mph = (5 × 1.609344) = 8.04672 km/h

Miles per hour and kilometers per hour are both units used to measure speed. Keep reading to learn more about each unit of measure.

## Miles Per Hour

Miles per hour are a measurement of speed expressing the distance traveled in miles in one hour.<2>

The mile per hour is a US customary and imperial unit of speed. Miles per hour can be abbreviated as *mph*, and are also sometimes abbreviated as *mi/h* or *MPH*. For example, 1 mile per hour can be written as 1 mph, 1 mi/h, or 1 MPH.

Miles per hour can be expressed using the formula: vmph = dmithr

The velocity in miles per hour is equal to the distance in miles divided by time in hours.

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## Kilometers Per Hour

Kilometers per hour are a measurement of speed expressing the distance traveled in kilometers in one hour.

The kilometer per hour, or kilometre per hour, is an SI unit of speed in the metric system. Kilometers per hour can be abbreviated as *km/h*, and are also sometimes abbreviated as *kph*. For example, 1 kilometer per hour can be written as 1 km/h or 1 kph.

In formal expressions, the slash, or solidus (/), is used to separate units used to indicate division in an expression.

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<3>

Kilometers per hour can be expressed using the formula: vkm/h = dkmthr

The velocity in kilometers per hour is equal to the distance in kilometers divided by time in hours.

## Mile Per Hour to Kilometer Per Hour Conversion Table

Mile per hour measurements converted to kilometers per hour Miles Per Hour Kilometers Per Hour1 mph | 1.61 km/h |

2 mph | 3.22 km/h |

3 mph | 4.83 km/h |

4 mph | 6.44 km/h |

5 mph | 8.05 km/h |

10 mph | 16.09 km/h |

15 mph | 24.14 km/h |

20 mph | 32.19 km/h |

25 mph | 40.23 km/h |

30 mph | 48.28 km/h |

35 mph | 56.33 km/h |

40 mph | 64.37 km/h |

45 mph | 72.42 km/h |

50 mph | 80.47 km/h |

55 mph | 88.51 km/h |

60 mph | 96.56 km/h |

65 mph | 104.61 km/h |

70 mph | 112.65 km/h |

75 mph | 120.7 km/h |

80 mph | 128.75 km/h |

85 mph | 136.79 km/h |

90 mph | 144.84 km/h |

95 mph | 152.89 km/h |

100 mph | 160.93 km/h |

## References

National Institute of Standards and Technology, NIST Guide to the SI, https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8Wikipedia, Miles per hour, https://en.wikipedia.org/wiki/Miles_per_hourNational Institute of Standards and Technology, NIST Guide to the SI, Chapter 6: Rules and Style Conventions for Printing and Using Units, https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-6-rules-and-style-conventions-printing-and-using

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