How to convert miles/hour to kilometers/hour

Step-by-step explanation of how to convert miles/hour to kilometers/hour, with formulas, worked examples, and a free online calculator.

To convert miles per hour to kilometers per hour, multiply by 1.609344. The formula is: km/h = mph × 1.609344. For example, 60 mph × 1.609344 = 96.56 km/h. This is the conversion you need when reading speed limit signs while driving abroad, or comparing car specifications between the United States and the rest of the world. Quick memory aid: 60 mph is roughly 100 km/h. To convert the other way, divide km/h by 1.609344.