Conversion formula

The conversion factor from miles to kilometers is 1.609344, which means that 1 mile is equal to 1.609344 kilometers:

1 mi = 1.609344 km

To convert 45 miles into kilometers we have to multiply 45 by the conversion factor in order to get the length amount from miles to kilometers. We can also form a simple proportion to calculate the result:

1 mi → 1.609344 km

45 mi → L_(km)

Solve the above proportion to obtain the length L in kilometers:

L_(km) = 45 mi × 1.609344 km

L_(km) = 72.42048 km

The final result is:

45 mi → 72.42048 km

We conclude that 45 miles is equivalent to 72.42048 kilometers:

45 miles = 72.42048 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 0.013808248716385 × 45 miles.

Another way is saying that 45 miles is equal to 1 ÷ 0.013808248716385 kilometers.

Approximate result

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

45 mi ≅ 72.42 km

An alternative is also that one kilometer is approximately zero point zero one four times forty-five miles.

Conversion table

miles to kilometers chart

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