Miles per Hour to Kilometers per Hour

Formula

The hour stays the same, so the mile length is the whole factor:

km/h = mph × 1.609344

This converts a speed number. It does not divide a distance by a time.

Assumptions

• The value can be zero and cannot be negative.
• The result is shown with up to six decimal places.

Worked example

1 mile per hour equals 1.609344 kilometers per hour.

Input definitions

Miles per hour

International miles per hour.

Limitations

A vehicle's speedometer error is not included. Knots are a different page.

Questions