Square kilometre

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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:

• the area of a square measuring 1 kilometre on each side
• 1 000 000 m²
• 100 hectares
• 0.386 102 square miles (statute)
• 247.105 381 acres

Conversely:

• 1 m² = 0.000 001 km²
• 1 hectare = 0.01 km²
• 1 square mile = 2.589 988 km²
• 1 acre = 0.004 047 km²

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.

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).

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.af:Vierkante kilometer

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Wikipedia information about Square kilometre This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Square kilometre". It may not have been reviewed by professional editors (see full disclaimer). Help contribute to Americola and edit this article.