To calculate the quantity of cement, sand, and aggregate quantity in concrete, we need to have the volume and the grade of the concrete structure of which we want the quantity.
Step 1:
Calculating the dry volume out of the wet volume of the concrete by multiplying the wet volume of concrete with 1.54
(1.54 is a conversion factor of wet volume to dry volume of concrete i.e., Dry volume = Wet volume + 54 % of Wet volume)
Step 2:
Calculating the cement quantity,
Get the part of cement content in the concrete mix from the grade specified in fraction (for Example, part of cement in grade M15 is 1/7 as ratio is 1:2:4).
Multiply the same with the required dry volume of the concrete you will get the cement required in volume which has to be converted to weight.
Multiply the cement in volume with the cement density i.e., 1440 kg/m^{3} to get the required cement in
Step 3:
Calculating the sand quantity,

 Get the part of sand content in the concrete mix from the grade specified in fraction (for Example, part of cement in grade M15 is 2/7 as ratio is 1:2:4).
 Multiply the same with the required dry volume of the concrete you will get the sand required in volume which have to converted to weight.
 Multiply the sand in volume with the sand density i.e., 1740 kg/m^{3} to get the required cement in Kgs.
Step 4:
Calculating the aggregate quantity,
 Get the part of aggregate content in the concrete mix from the grade specified in fraction from. (Example, part of cement in grade M15 is 4/7 as ratio is 1:2:4).
 Multiply the same with the required dry volume of the concrete you will get the aggregate required in volume which has to be converted to weight.
 Multiply the aggregate in volume with the aggregate density i.e., 1550 kg/m^{3 }to get the required cement in kgs.
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