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Kilometres to Miles Converter

Convert a distance in kilometres (km) to miles (mi) using the exact international mile.

kilometres

Results

Miles

62.137 mi

Miles: 62.137 miles.

Formula

Miles
= kilometres ÷ 1.609344

One international mile is exactly 1.609344 km, so one kilometre is about 0.621371 miles.

Worked example

A road sign says the next town is 100 km away. How far is that in miles?

  1. Step 1: Convert to miles

    100 ÷ 1.609344 = 62.137 mi

100 km is 62.137 miles.

Kilometres to miles table

Common distances, rounded to three decimal places:

  • 1 km = 0.621 mi
  • 5 km = 3.107 mi
  • 10 km = 6.214 mi
  • 21.0975 km = 13.109 mi
  • 42.195 km = 26.219 mi
  • 50 km = 31.069 mi
  • 100 km = 62.137 mi
  • 500 km = 310.686 mi
  • 1,000 km = 621.371 mi

Converting in your head

Multiply by 5 and divide by 8. The result is within about 0.6% of the exact answer: 80 km is roughly 50 miles.

Multiplying by 0.6 is quicker but gives an answer about 3.4% too low, which adds up over long distances.

Frequently asked questions

How many miles are in a kilometre?

One kilometre is 0.621371 miles (1 ÷ 1.609344), a little under two-thirds of a mile.

Is 1.609344 km per mile exact?

Yes. The international yard is defined as exactly 0.9144 metres, and a mile is 1,760 yards, so a mile is exactly 1,609.344 metres.

Can I use this to convert km/h to mph?

Yes. Speed conversion uses the same factor, so 100 km/h is 62.137 mph and 50 km/h is 31.069 mph.

Does this convert to nautical miles?

No. This converter uses the ordinary (statute) mile used on road signs. A nautical mile is a different unit of exactly 1.852 km.

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