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Square kilometre (U.S. spelling: square kilometer), symbol km², is a decimal multiple of SI unit of surface area square metre, one of the SI derived units. 1 km² is equal to:
Conversely:
Note: "km²" means square kilometre and not kilo–square metre. For example, 3 km² is equal to 3 * (1,000 m)² = 3,000,000 m², not 3,000 m².
The 106 m² orders of magnitude page gives comparisons with geographic areas.
A hectare (10<sup>4</sup> m²) is less than a square kilometre which is less than a square megametre (10<sup>12</sup> m²).
(P)êng-hong-kong-lí ()вадратны кілямэтар