# Miles Per Hour to Kilometers Per Hour Conversion

Enter the speed in miles per hour below to get the value converted to kilometers per hour.

**Results in Kilometers Per Hour:**

## How to Convert Miles Per Hour to Kilometers Per Hour

The fastest way to convert miles per hour to kilometers per hour is to use this simple formula:

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.

**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 travelled 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:

v_{mph} = d_{mi}t_{hr}

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

## Kilometers Per Hour

Kilometers per hour are a measurement of speed expressing the distance travelled 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.^{[3]}

Kilometers per hour can be expressed using the formula:

v_{km/s} = d_{km}t_{hr}

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

Miles Per Hour | Kilometers Per Hour |
---|---|

1 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-b8
- Wikipedia, Miles per hour, https://en.wikipedia.org/wiki/Miles_per_hour
- National 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