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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