km/h to mph converter

How to convert kilometers per hour to miles per hour

Divide kilometres per hour by 1.609344 to get miles per hour. One hundred km/h is 62.137 mph. The road-sign pairing of 100 km/h with 60 mph is a round number, two miles per hour low. Ten km/h is 6.214 mph. The same 1.609344 is the international mile, so a distance conversion and this speed conversion stay consistent: 100 km at 100 km/h takes the same hour as 62.137 miles at 62.137 mph.

Reading a European speed limit against a US speedometer, or a running pace displayed in km/h when you think in mph. 130 km/h, a common motorway limit, is 80.778 mph. 5 km/h of walking is 3.107 mph. If the device says min/km, convert the speed only after you turn the pace into km/h.

Exact formula

Formulamph = km/h ÷ 1.609344

mph = km/h ÷ 1.609344 One km/h is 0.621371192237 mph. Ten km/h is 6.21371192237 mph. The worked example below uses that same conversion.

Conversion table

The kilometers per hour column runs from 1 km/h (0.6214 mph) through 300 km/h (186.41 mph).

Worked example: Kilometers per hour to Miles per hour

One hundred kilometres per hour is 62.137 mph, not 60 mph. The sign pair is a round number, about two miles per hour low. A 130 km/h motorway limit is 80.778 mph. Fifty km/h through a town is 31.069 mph. Dividing by 1.6 instead of 1.609344 turns 100 km/h into 62.5 mph. The defined quotient is the longer decimal. Knots use 1.852. A navigation distance in kilometres still belongs on the distance page even when the speedometer is the reason you cared.

Pitfalls for kilometers per hour to miles per hour

• Dividing by 1.6 instead of 1.609344 makes 100 km/h look like 62.5 mph. The defined value is 62.137.
• Knots to mph is a different factor (1.852 / 1.609344).
• km/h and km are not the same box. A navigation distance still needs the distance page.
• Average speed is total distance over total time. Converting a single reading does not fix a stopped-time average.