Superficies
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Superficies
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| 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 | |
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Conversion factors
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1 square mile = 2.5899 square kilometres : 1 square kilometre = 0.3861 square miles
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1 acre = 0.4047 hectares : 1 hectare = 2.471 acres
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1 square yard = 0.836 square metres : 1 square metre = 1.196 square yards
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1 square foot = 0.0929 square metres : 1 square metre = 10.764 square feet
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1 square inch = 645.2 square millimetres : 1 square millimetre = 0.00155 square inches
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