Miles per Hour to Kilometers per Hour converter

Quick reference

Miles per Hour	Kilometers per Hour
1	1.609344
2	3.218688
5	8.04672
10	16.09344
20	32.18688
25	40.2336
50	80.4672
100	160.9344
250	402.336
500	804.672
1,000	1,609.344

About speed units

Speed units follow their distance units: miles per hour in the US and UK, kilometers per hour nearly everywhere else, meters per second in physics, and knots (nautical miles per hour) at sea and in the air. A knot is 1.852 km/h exactly, tied to the nautical mile's definition as one minute of latitude. Quick anchors: 60 mph is 96.6 km/h, a 100 km/h motorway limit is 62 mph, and hurricane force starts at 64 knots.

More speed conversions

Kilometers per Hour → Miles per Hour Kilometers per Hour → Miles per Hour Knots → Miles per Hour Feet per Second → Miles per Hour Meters per Second → Kilometers per Hour All converters

Frequently asked questions

What is the exact formula for Miles per Hour to Kilometers per Hour?

Multiply the Miles per Hour value by 1.609344. This comes from the exact unit definitions, not a rounded approximation.

Is this conversion exact?

The underlying ratio is exact where a legal definition exists (for example, 1 inch = 25.4 mm exactly). Displayed results are rounded to six decimal places for readability.

Can I convert Kilometers per Hour back to Miles per Hour?

Yes. Use the reverse converter linked below, or just swap which field you type into: the live converter recalculates either direction.