# Miles Per Hour to Mach Number Conversion

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

**Results in Mach Number:**

## How to Convert Miles Per Hour to Mach Number

To convert a mile per hour measurement to a Mach measurement, multiply the speed by the conversion ratio. One mile per hour is equal to Mach 0.001303, so use this simple formula to convert:

The Mach number is equal to the speed in miles per hour multiplied by 0.001303.

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

Miles per hour and Mach number 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.^{[1]}

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.

## Mach Number

Mach, sometimes also referred to as a Mach number, is the ratio of the speed of an object to the speed of sound.^{[2]}

Mach can be abbreviated as M, and is also sometimes abbreviated as Ma. For example, Mach 1 can be written as 1 M or 1 Ma.

Although Mach can be abbreviated *M* or *Ma*, the Mach number is typically expressed with the number after the unit name.
For example, the expression *Mach 3* is preferred rather than *3 Machs* or *3 M*.

The speed is classified as either subsonic, transonic, supersonic, or hypersonic depending on the Mach number.

Speed Classification | Mach Number |
---|---|

Subsonic | Mach < 1.0 |

Transonic | Mach = 1.0 |

Supersonic | Mach > 1.0 |

Hypersonic | Mach > 5.0 |

## Mile Per Hour to Mach Conversion Table

Miles Per Hour | Mach Number |
---|---|

191.82 mph | Mach 0.25 |

383.63 mph | Mach 0.5 |

575.45 mph | Mach 0.75 |

767.27 mph | Mach 1 |

1,151 mph | Mach 1.5 |

1,535 mph | Mach 2 |

1,918 mph | Mach 2.5 |

2,302 mph | Mach 3 |

2,685 mph | Mach 3.5 |

3,069 mph | Mach 4 |

3,453 mph | Mach 4.5 |

3,836 mph | Mach 5 |

4,220 mph | Mach 5.5 |

4,604 mph | Mach 6 |

4,987 mph | Mach 6.5 |

5,371 mph | Mach 7 |

5,755 mph | Mach 7.5 |

6,138 mph | Mach 8 |

6,522 mph | Mach 8.5 |

6,905 mph | Mach 9 |

7,289 mph | Mach 9.5 |

7,673 mph | Mach 10 |

## References

- Wikipedia, Miles per hour, https://en.wikipedia.org/wiki/Miles_per_hour
- NASA, Mach Number, https://www.grc.nasa.gov/WWW/BGH/mach.html