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Square kilometre

Square kilometre (U.S. spelling: square kilometer), symbol km², is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km² is equal to:

  • 1,000,000 m²
  • 100 ha (hectare)


  • 1 m² = 0.000 001 (10-6) km²
  • 1 hectare = 0.01 (10-2) km²
  • 1 square mile = 2.589 988 km²
  • 1 acre = 0.004 047 km², 40.47 ha or 4047 m²

Note: "km²" means (km)², square kilometre or kilometre squared, and not k(m²), kilo–square metre. For example, 3 km² is equal to 3 * (1,000 m)² = 3,000,000 m², not 3,000 m².

Comparative order

The 106 m² orders of magnitude page gives comparisons with geographic areas.

A hectare (104 m²) is less than a square kilometre which is less than a square megametre (1012 m²).


  • Conversion Factors. MINFILE Coding Manual. Ministry of Energy, Mines and Petroleum Resources. Retrieved on 2007-10-13.

See also

  • Conversion of units.
  • SI prefix for the precise meaning of the prefix "k"
  • Square Kilometre Array, a proposed radio telescope
    which is intended to have a collecting area of approximately one square kilometre.
be-x-old:Квадратны кілямэтар
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Square_kilometre". A list of authors is available in Wikipedia.
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