Speed
Kilometres per hour back to miles per hour
Divide by the same factor, or multiply by its inverse. Never multiply by 1.609344 in this direction.
The Formula
mph = kph / 1.609344 = kph x 0.62137119
Divide by the same factor, or multiply by its inverse. Never multiply by 1.609344 in this direction.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| kph | Speed in kilometres per hour | kilometres per hour | The quantity you are converting away from. |
| 0.62137119 | Miles per kilometre | mi per km | The reciprocal of 1.609344, to eight decimal places. |
| mph | Speed in miles per hour | miles per hour | Smaller than the kilometre figure, which is the sanity check. |
What Each Symbol Means
kphkilometres per hour
Speed in kilometres per hour
The quantity you are converting away from.
0.62137119mi per km
Miles per kilometre
The reciprocal of 1.609344, to eight decimal places.
mphmiles per hour
Speed in miles per hour
Smaller than the kilometre figure, which is the sanity check.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to convert mph to kph page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Convert Mph To Kph, filed under Unit Conversion. Every number the guide produces comes from substituting into this one line.