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The mile is defined as exactly 1,609.344 metres. It originates from the Roman mille passuum (1,000 paces). The nautical mile (1,852m) is different — based on one arcminute of latitude.
1 mile = 1.60934 kilometres. So 5 miles = 8.047 km. A 5K race (5 km) = 3.107 miles.
100 km = 62.137 miles. Formula: km × 0.621371 = miles.
A regular (statute) mile = 1,609.34m. A nautical mile = 1,852m (about 15% longer). Nautical miles are used in aviation and marine navigation.
Exactly 5,280 feet. This is a common exam question. 1 mile = 5,280 ft = 1,760 yards = 1,609.344 metres.
1 mile equals 1.60934 kilometres. For a quick mental estimate, multiply miles by 1.6 to get approximate kilometres.