Multiply the miles by 1.609344, since one mile is defined as exactly 1.609344 km. So 5 miles is about 8.05 km and 10 miles is about 16.09 km. A free converter returns the exact figure instantly.
Free miles to km converter. Convert miles to kilometers instantly using the exact factor (1 mile = 1.609344 km). Live result as you type, no sign-up.
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Open Length Converter →The international mile is defined as exactly 1,609.344 meters, so km = miles x 1.609344 with no approximation in the factor itself. A quick mental shortcut is to add about 60 percent: 10 miles becomes roughly 16 km, which matches the true 16.09.
Common values: 1 mile is about 1.61 km, 3 miles is 4.83 km, 5 miles is 8.05 km, 10 miles is 16.09 km, and 100 miles is 160.93 km. The marathon runs the other way: the official distance is 42.195 km, which is about 26.22 miles. For speed, 60 mph is about 96.56 km/h.
The official marathon distance is 42.195 km, which converts to about 26.22 miles.
About 96.56 km/h, from 60 x 1.609344.
Multiply by 1.6, or add 60 percent. That is off by less than 1 percent from the exact factor 1.609344.