## 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 3.9 kilometers per hour into miles per hour we have to multiply 3.9 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

3.9 km/h → V(mph)

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

V(mph) = 3.9 km/h × 0.62137119223783 mph

V(mph) = 2.4233476497275 mph

The final result is:

3.9 km/h → 2.4233476497275 mph

We conclude that 3.9 kilometers per hour is equivalent to 2.4233476497275 miles per hour:

3.9 kilometers per hour = 2.4233476497275 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 0.41265230769198 × 3.9 kilometers per hour.

Another way is saying that 3.9 kilometers per hour is equal to 1 ÷ 0.41265230769198 miles per hour.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that three point nine kilometers per hour is approximately two point four two three miles per hour:

3.9 km/h ≅ 2.423 mph

An alternative is also that one mile per hour is approximately zero point four one three times three point nine 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)
4.9 kilometers per hour 3.045 miles per hour
5.9 kilometers per hour 3.666 miles per hour
6.9 kilometers per hour 4.287 miles per hour
7.9 kilometers per hour 4.909 miles per hour
8.9 kilometers per hour 5.53 miles per hour
9.9 kilometers per hour 6.152 miles per hour
10.9 kilometers per hour 6.773 miles per hour
11.9 kilometers per hour 7.394 miles per hour
12.9 kilometers per hour 8.016 miles per hour
13.9 kilometers per hour 8.637 miles per hour