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:
Conversely:
- 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 (10 m2) is less than a square kilometer which is less than a square megametre (1012 m2).
Source
See also
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