Square kilometre
Square kilometre, 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 =
- 1 acre = , 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 = 3,000,000 m2, not 3,000 m2.
See also
- Conversion of units
- SI prefix for the precise meaning of the prefix "k"
- Square Kilometre Array, a proposed radio telescope in South Africa, which is intended to have a collecting area of approximately 1 km2