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 420 miles into kilometers we have to multiply 420 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

420 mi → L_(km)

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

L_(km) = 420 mi × 1.609344 km

L_(km) = 675.92448 km

The final result is:

420 mi → 675.92448 km

We conclude that 420 miles is equivalent to 675.92448 kilometers:

420 miles = 675.92448 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 0.0014794552196127 × 420 miles.

Another way is saying that 420 miles is equal to 1 ÷ 0.0014794552196127 kilometers.

Approximate result

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

420 mi ≅ 675.924 km

An alternative is also that one kilometer is approximately zero point zero zero one times four hundred twenty 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