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
30
36
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
30
Forty five 80 pound bags of cement are needed to make one cubic yard of concrete.
20' by 26' by 5" requires at least 10 cubic yards of cement.
4 bags of 50 kg each= 200 kg of cement.
You will need 27.6 cubic yards of cement.
You will need at least 9.68 cubic yards of cement.
M20 - 6.20bags
0.86 cubic yards is needed.
3.95 cubic yards of cement are needed for a slab that size.
14.81 cubic yards.
A minimum of 5.93 cubic yards is needed.
A total of 3,250,000 cubic yards.