# Speed Conversion: Convert mph to km/h, km/h to mph

Use the **online** conversion calculators to convert between miles per hour (mph) and kilometers per hour (km/h).

## Conversion Calculators

Enter your value in one of the conversion calculators below to **convert mph to km/h** or **convert km/h to mph**.

## Convert mph to km/h

## Convert km/h to mph

**How to convert mph to km/h**: Use the conversion calculator on the left-hand side titled "Convert mph to km/h". Enter a value in the mph field and click on the "Calculate km/h" button. Your answer will appear in the km/h field.

**How to convert km/h to mph**: Use the conversion calculator on the right-hand side titled "Convert km/h to mph". Enter a value in the km/h field and click on the "Calculate mph" button. Your answer will appear in the mph field.

## Definitions

Below are definitions relating to these conversion formulas:

Unit | Symbol | Measurement System | Description |
---|---|---|---|

inches per hour | in/h | US Customary Units (and Imperial) | |

feet per hour | ft/h | US Customary Units (and Imperial) | 1 ft/h = 12 in/h |

yards per hour | yd/h | US Customary Units (and Imperial) | 1 yd/h = 3 ft/h |

miles per hour | mph | US Customary Units (and Imperial) | 1 mph = 1760 yd/h 1 mph = 5280 ft/h |

millimeters per hour | mm/h | Metric System | 1000 mm/h = 1 m/h |

centimeters per hour | cm/h | Metric System | 100 cm/h = 1 m/h 1 cm/h = 10 mm/h |

decimeters per hour | dm/h | Metric System | 10 dm/h = 1 m/h 1 dm/h = 10 cm/h |

meters per hour | m/h | Metric System | 1 m/h = 1000 mm/h 1 m/h = 100 cm/h 1 m/h = 10 dm/h |

kilometers per hour | km/h | Metric System | 1 km/h = 1000 m/h |