## 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 21 kilometers per hour into miles per hour we have to multiply 21 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

21 km/h → V(mph)

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

V(mph) = 21 km/h × 0.62137119223783 mph

V(mph) = 13.048795036994 mph

The final result is:

21 km/h → 13.048795036994 mph

We conclude that 21 kilometers per hour is equivalent to 13.048795036994 miles per hour:

21 kilometers per hour = 13.048795036994 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 0.076635428571367 × 21 kilometers per hour.

Another way is saying that 21 kilometers per hour is equal to 1 ÷ 0.076635428571367 miles per hour.

## Approximate result

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

21 km/h ≅ 13.049 mph

An alternative is also that one mile per hour is approximately zero point zero seven seven times twenty-one 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)
22 kilometers per hour 13.67 miles per hour
23 kilometers per hour 14.292 miles per hour
24 kilometers per hour 14.913 miles per hour
25 kilometers per hour 15.534 miles per hour
26 kilometers per hour 16.156 miles per hour
27 kilometers per hour 16.777 miles per hour
28 kilometers per hour 17.398 miles per hour
29 kilometers per hour 18.02 miles per hour
30 kilometers per hour 18.641 miles per hour
31 kilometers per hour 19.263 miles per hour