square kilometre | |
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![]() The square kilometre (red square) compared to other areas, including a square mile (the entire yellow square) | |
General information | |
Unit system | SI units |
Unit of | area |
Symbol | km2 |
Conversions | |
1 km2 in ... | ... is equal to ... |
SI units |
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Imperial/US |
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The square kilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area.
1 km2 is equal to:
It is also approximately equal to:
Conversely:
The symbol "km2" means (km)2, square kilometre or kilometre squared and not k(m2), kilo–square metre. For example, 3 km2 is equal to 3×(1,000m)2 = 3,000,000 m2, not 3,000 m2.