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The kilometre (American kilometer) is an SI unit of length, equal to 1000 metres, commonly used for measuring distances on the earth's surface. The abbreviation for kilometre is km.

The mile used in the United States is exactly 1.609 344 km long.

The kilometre in relation to other units
1 kilometre 0.621 37 mile
1 kilometre 1000 metres
1 kilometre 3280.84 feet
1 kilometre 100 000 centimetres