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)
- 0.386102 square miles
- 247.105381 acres
Conversely:
- 1 m2 = 0.000 001 (10−6) km2
- 1 hectare = 0.01 (10−2) km2
- 1 square mile = 2.589988km2
- 1 acre = 0.004047km2, 0.4047ha 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×(1,000m)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).
Source
- "Conversion Factors". MINFILE Coding Manual. Ministry of Energy, Mines and Petroleum Resources. Government of British Columbia. http://www.empr.gov.bc.ca/Mining/Geolsurv/Minfile/manuals/coding/appdvii.htm. 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
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