Square kilometre
Unit of area / From Wikipedia, the free encyclopedia
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The square kilometre (square kilometer in American spelling; symbol: km^{2}) is a multiple of the square metre, the SI unit of area or surface area.
Quick Facts General information, Unit system ...
square kilometre  

General information  
Unit system  SI units 
Unit of  area 
Symbol  km^{2} 
Conversions  
1 km^{2} in ...  ... is equal to ... 
SI units 

Imperial/US 

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1 km^{2} is equal to:
 1,000,000 square metres (m^{2})
 100 hectares (ha)
It is also approximately equal to:
 0.3861 square miles ^{[2]}
 247.1 acres ^{[3]}
Conversely:
 1 m^{2} = 0.000001 (10^{−6}) km^{2}
 1 hectare = 0.01 (10^{−2}) km^{2}
 1 square mile = 2.5899 km^{2} ^{[4]}
 1 acre = about 0.004047 km^{2} ^{[5]}
The symbol "km^{2}" means (km)^{2}, square kilometre or kilometre squared and not k(m^{2}), kilo–square metre. For example, 3 km^{2} is equal to 3×(1,000m)^{2} = 3,000,000 m^{2}, not 3,000 m^{2}.