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Superficies

Superficies
 
1 square mile = 640 acres 1 square kilometre=100 hectares
1 acre = 10 square chains 1 hectare = 100 ares
1 square chain = 16 square rods 1 are = 100 square metres
1 square rod = 30.25 square yards 1 square metre = 100 square decimetres
1 square yard = 9 square feet 1 square decimetre = 100 square centimetres
1 square foot = 144 square inches 1 square centimetre = 100 square millimetres
1 circular inch = 0.7854 square inches  
 
Conversion factors
 
1 square mile = 2.5899 square kilometres : 1 square kilometre = 0.3861 square miles
1 acre = 0.4047 hectares : 1 hectare = 2.471 acres
1 square yard = 0.836 square metres : 1 square metre = 1.196 square yards
1 square foot = 0.0929 square metres : 1 square metre = 10.764 square feet
1 square inch = 645.2 square millimetres : 1 square millimetre = 0.00155 square inches