Kilometers per Hour to Miles per Hour converter

Quick reference

Kilometers per Hour	Miles per Hour
1	0.621371
2	1.242742
5	3.106856
10	6.213712
20	12.427424
25	15.53428
50	31.06856
100	62.137119
250	155.342798
500	310.685596
1,000	621.371192

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

Miles per Hour → Kilometers per Hour Miles per Hour → Kilometers 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 Kilometers per Hour to Miles per Hour?

Multiply the Kilometers per Hour value by 0.62137119. 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 Miles per Hour back to Kilometers per Hour?

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