Converting Standard UnitsConverting measurements of length, area, volume, mass and time from one unit to another. 
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Unit  Relationship 

square kilometre (km^{2})  1 km^{2} = 1000000 m^{2} 
hectare (ha)  1 ha = 10000 m^{2} 
square metre (m^{2})  1 m^{2} = 10000 cm^{2} 
square centimetre (cm^{2})  1 cm^{2} = 100 mm^{2} 
The hectare is a nonSI metric unit of area equal to a square with sides of 100m and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectare and one hectare contains about 2.47 acres.
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