Conversion formula

The conversion factor from miles per hour to kilometers per hour is 1.6093439999987, which means that 1 mile per hour is equal to 1.6093439999987 kilometers per hour:

1 mph = 1.6093439999987 km/h

To convert 521 miles per hour into kilometers per hour we have to multiply 521 by the conversion factor in order to get the velocity amount from miles per hour to kilometers per hour. We can also form a simple proportion to calculate the result:

1 mph → 1.6093439999987 km/h

521 mph → V_(km/h)

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

V_(km/h) = 521 mph × 1.6093439999987 km/h

V_(km/h) = 838.46822399933 km/h

The final result is:

521 mph → 838.46822399933 km/h

We conclude that 521 miles per hour is equivalent to 838.46822399933 kilometers per hour:

521 miles per hour = 838.46822399933 kilometers per hour

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer per hour is equal to 0.0011926510407636 × 521 miles per hour.

Another way is saying that 521 miles per hour is equal to 1 ÷ 0.0011926510407636 kilometers per hour.

Approximate result

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

521 mph ≅ 838.468 km/h

An alternative is also that one kilometer per hour is approximately zero point zero zero one times five hundred twenty-one miles per hour.

Conversion table

miles per hour to kilometers per hour chart

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