Miles to km converter

km = miles × 1.609344

The international mile is exactly 1,609.344 meters, so the factor 1.609344 is exact.

Example: 60 miles × 1.609344 = 96.56 km, roughly an hour's drive on a highway.

Race distances are set in kilometers, and the mile figures are rounded: the marathon is exactly 42.195 km, which is 26.219 miles. Converting 26.2 mi back gives 42.165 km, 30 meters short, so for race distances quote the official kilometers.

The same factor converts speeds: km/h = mph × 1.609344, so 60 mph is 96.56 km/h and 70 mph is 112.65 km/h. For running pace it works the other way, because pace is time per distance: a 10-minute mile is a 6:13 per kilometer pace (10 ÷ 1.609344 = 6.21 minutes). The converter has separate Speed and Running pace tabs for these.

A nautical mile, used at sea and in aviation, is exactly 1,852 meters (1.852 km), about 15% longer than a statute mile. It's based on one minute of latitude. Speeds in nautical miles per hour are knots: 20 knots is 37.04 km/h or 23.02 mph.

Road signs in the United States and the United Kingdom show distances in miles, while Canada, Ireland, Australia and most of the world use kilometers. If you're renting a car abroad, the speedometer and the signs will usually agree with each other, so it's mainly trip planning and fuel estimates that need converting.

• Multiply by 1.6: 10 miles ≈ 16 km (exact: 16.09).
• Use Fibonacci numbers: consecutive Fibonacci numbers are close to the mile-to-km ratio, so 3 mi ≈ 5 km, 5 mi ≈ 8 km, 8 mi ≈ 13 km, 13 mi ≈ 21 km.
• Add 60%: 50 miles + 30 = 80 km (exact: 80.47).

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To go the other way, use the km to miles converter.