Square kilometre

About Square kilometre

'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:

★ the area of a square measuring 1 kilometre on each side

★ 1, 000, 000 (106) m²

★ 100 hectares (ha)

★ 0.386 102 square miles (statute)

★ 247.105 381 acres
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.

Contents
Comparative order
See also

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.


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