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Square kilometre (symbol km²) is an SI unit of surface area. It is 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

The 1 E6 m² orders of magnitude page gives comparisons with geographic areas.

hectare << square kilometre << square megametre

1 See also

Conversion of units.

2 External links

SI derived units of area

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