Mile per hour to Kilometer per hour Converter

1 mile per hour is exactly 1.609344 kilometers per hour. Convert miles per hour (mph) to kilometers per hour (km/h) below: type a value and the result updates as you type.

mph to km/h calculator

Result

Mile per hour to Kilometer per hour conversion

1 mph = 1.609344 km/hone mile per hour in kilometers per hour

1 km/h ≈ 0.6213711922 mphone kilometer per hour in miles per hour

Mile per hour (mph): One international mile per hour: exactly 0.44704 meters per second.

Kilometer per hour (km/h): Exactly 1000 meters per 3600 seconds.

Source:Mile per hour: International yard and pound agreement (1959); Kilometer per hour: SI Brochure, 9th edition (BIPM, 2019)

How to convert miles per hour to kilometers per hour

To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.609344.

Formula

km/h = mph × 1.609344

Examples

5 mph = 5 × 1.609344 = 8.04672 km/h
25 mph = 25 × 1.609344 = 40.2336 km/h
100 mph = 100 × 1.609344 = 160.9344 km/h

Mile per hour to Kilometer per hour conversion table

Mile per hour to Kilometer per hour
Mile per hour (mph)	Kilometer per hour (km/h)
0.1 mph	0.1609344 km/h
0.5 mph	0.804672 km/h
1 mph	1.609344 km/h
2 mph	3.218688 km/h
3 mph	4.828032 km/h
5 mph	8.04672 km/h
10 mph	16.09344 km/h
20 mph	32.18688 km/h
25 mph	40.2336 km/h
50 mph	80.4672 km/h
100 mph	160.9344 km/h
250 mph	402.336 km/h
500 mph	804.672 km/h
1000 mph	1609.344 km/h

Values rounded to 10 significant digits where needed.

Frequently asked questions

How many kilometers per hour are in one mile per hour?: One mile per hour is exactly 1.609344 kilometers per hour.
How do I convert kilometers per hour to miles per hour?: To convert kilometers per hour to miles per hour, divide the number of kilometers per hour by 1.609344. The formula is mph = km/h ÷ 1.609344.
Is this conversion exact?: Yes. Both units have exact definitions and the factor 1.609344 is exact. Displayed results are only rounded when they have many decimal places.
Which is larger, a mile per hour or a kilometer per hour?: A mile per hour is 1.609344 times larger than a kilometer per hour. In other words, a kilometer per hour is about 0.6213711922 of a mile per hour.