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 42.1 miles into kilometers we have to multiply 42.1 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

42.1 mi → L_(km)

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

L_(km) = 42.1 mi × 1.609344 km

L_(km) = 67.7533824 km

The final result is:

42.1 mi → 67.7533824 km

We conclude that 42.1 miles is equivalent to 67.7533824 kilometers:

42.1 miles = 67.7533824 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 0.014759410741979 × 42.1 miles.

Another way is saying that 42.1 miles is equal to 1 ÷ 0.014759410741979 kilometers.

Approximate result

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

42.1 mi ≅ 67.753 km

An alternative is also that one kilometer is approximately zero point zero one five times forty-two point one 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