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 640 miles into kilometers we have to multiply 640 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

640 mi → L_(km)

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

L_(km) = 640 mi × 1.609344 km

L_(km) = 1029.98016 km

The final result is:

640 mi → 1029.98016 km

We conclude that 640 miles is equivalent to 1029.98016 kilometers:

640 miles = 1029.98016 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 0.00097089248787083 × 640 miles.

Another way is saying that 640 miles is equal to 1 ÷ 0.00097089248787083 kilometers.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred forty miles is approximately one thousand twenty-nine point nine eight kilometers:

640 mi ≅ 1029.98 km

An alternative is also that one kilometer is approximately zero point zero zero one times six hundred forty 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