## Conversion formula

The conversion factor from kilometers per hour to miles per hour is 0.62137119223783, which means that 1 kilometer per hour is equal to 0.62137119223783 miles per hour:

1 km/h = 0.62137119223783 mph

To convert 40 kilometers per hour into miles per hour we have to multiply 40 by the conversion factor in order to get the velocity amount from kilometers per hour to miles per hour. We can also form a simple proportion to calculate the result:

1 km/h → 0.62137119223783 mph

40 km/h → V(mph)

Solve the above proportion to obtain the velocity V in miles per hour:

V(mph) = 40 km/h × 0.62137119223783 mph

V(mph) = 24.854847689513 mph

The final result is:

40 km/h → 24.854847689513 mph

We conclude that 40 kilometers per hour is equivalent to 24.854847689513 miles per hour:

40 kilometers per hour = 24.854847689513 miles per hour

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 mile per hour is equal to 0.040233599999968 × 40 kilometers per hour.

Another way is saying that 40 kilometers per hour is equal to 1 ÷ 0.040233599999968 miles per hour.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that forty kilometers per hour is approximately twenty-four point eight five five miles per hour:

40 km/h ≅ 24.855 mph

An alternative is also that one mile per hour is approximately zero point zero four times forty kilometers per hour.

## Conversion table

### kilometers per hour to miles per hour chart

For quick reference purposes, below is the conversion table you can use to convert from kilometers per hour to miles per hour

kilometers per hour (km/h) miles per hour (mph)
41 kilometers per hour 25.476 miles per hour
42 kilometers per hour 26.098 miles per hour
43 kilometers per hour 26.719 miles per hour
44 kilometers per hour 27.34 miles per hour
45 kilometers per hour 27.962 miles per hour
46 kilometers per hour 28.583 miles per hour
47 kilometers per hour 29.204 miles per hour
48 kilometers per hour 29.826 miles per hour
49 kilometers per hour 30.447 miles per hour
50 kilometers per hour 31.069 miles per hour