# Miles Per Hour to Kilometers Per Second Conversion

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

**Results in Kilometers Per Second:**

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

To convert a mile per hour measurement to a kilometer per second measurement, multiply the speed by the conversion ratio. One mile per hour is equal to 0.000447 kilometers per second, so use this simple formula to convert:

The speed in kilometers per second is equal to the miles per hour multiplied by 0.000447.

**For example,**here's how to convert 5,000 miles per hour to kilometers per second using the formula above.

Miles per hour and kilometers per second 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.

## Kilometers Per Second

Kilometers per second are a measurement of speed expressing the distance travelled in kilometers in one second.

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

In formal expressions, the slash, or solidus (/), is used to separate units used to indicate division in an expression.^{[2]}

Kilometers per second can be expressed using the formula:

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

The velocity in kilometers per second is equal to the distance in kilometers divided by time in seconds.

## Mile Per Hour to Kilometer Per Second Conversion Table

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

1 mph | 0.000447 km/s |

2 mph | 0.000894 km/s |

3 mph | 0.001341 km/s |

4 mph | 0.001788 km/s |

5 mph | 0.002235 km/s |

6 mph | 0.002682 km/s |

7 mph | 0.003129 km/s |

8 mph | 0.003576 km/s |

9 mph | 0.004023 km/s |

10 mph | 0.00447 km/s |

20 mph | 0.008941 km/s |

30 mph | 0.013411 km/s |

40 mph | 0.017882 km/s |

50 mph | 0.022352 km/s |

60 mph | 0.026822 km/s |

70 mph | 0.031293 km/s |

80 mph | 0.035763 km/s |

90 mph | 0.040234 km/s |

100 mph | 0.044704 km/s |

200 mph | 0.089408 km/s |

300 mph | 0.134112 km/s |

400 mph | 0.178816 km/s |

500 mph | 0.22352 km/s |

600 mph | 0.268224 km/s |

700 mph | 0.312928 km/s |

800 mph | 0.357632 km/s |

900 mph | 0.402336 km/s |

1,000 mph | 0.44704 km/s |

2,000 mph | 0.89408 km/s |

3,000 mph | 1.3411 km/s |

4,000 mph | 1.7882 km/s |

5,000 mph | 2.2352 km/s |

6,000 mph | 2.6822 km/s |

7,000 mph | 3.1293 km/s |

8,000 mph | 3.5763 km/s |

9,000 mph | 4.0234 km/s |

10,000 mph | 4.4704 km/s |

## References

- 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