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Square kilometre

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Square kilometre (symbol km2) is an SI unit of surface area. It is one of the SI derived units.

1 km2 is equal to:


  • 1 m2 = 0.000001 km2
  • 1 hectare = 0.01 km2
  • 1 square mile = 2.589988 km2
  • 1 acre = 0.004047 km2

The 1 E6 mē orders of magnitude page gives comparisons with geographic areas. See also Conversion of units.

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