How Many Km in a Mile?

I’m not a runner but I know that a 5k race is equal to 3.1 miles. Being somewhat good at math I can use this knowledge to determine how many km are in 1 mile. To get this number we would just divide 5 by 3.1 which equals approximately 1.6129. Therefore I now know that 1 mile equals 1.6129 kilometers.