It depends on the Grade of Concrete.
general grades are M15, M20, M25 etc.
here are the nos. of bag required
-------------------Bag for 1 cum---------------Bag for 5 cum
M15------------------- 6.4----------------------------32
M20-------------------- 8-----------------------------40
M25--------------------12----------------------------60
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Cement content varies on concrete type, but is typically 400kg per cubic metre. According to the manufacturer, Portland Cement (which is what 99.9% of all cement actually is) has a density of 1505kg/cubic meter.
7 cement bags per 1 cubic meter of concrete......
1 sq. feet = 144 sq. inchesSo,392 sq. feet = 144 * 392 sq inches = 56448 sq. inchesVolume of cement needed = 56448 sq inches * 4 inch = 225792 cubic inches225792 cubic inches = 1568 cubic feet