4 miles per hour in kilometers per hour
Result
The conversion result is: 4 miles per hour is equivalent to 6.437376 kilometers per hour.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 kilometer per hour is equal to 0.155342798059333 times 4 miles per hour.
It can also be expressed as: 4 miles per hour is equal to 1 / 0.155342798059333 kilometers per hour.
Approximation
An approximate numerical result would be: four miles per hour is about six point four four kilometers per hour, or alternatively, a kilometer per hour is about zero point one six times four miles per hour.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.