Calculation of cement bags,aggregate,sand as per IS Code

How to calculate cement bags sand and aggregate 

First decide the ratio of concrete and volume of concrete to be produced and then go with this formula:-

  Cement bags =(dry density X volume of concrete)/(sum of ratio X 0.035)

Example:-

Ratio for m20 is 1:1.5:3 and calculation for 1m3 of concrete how much cement bags are required?

 Ans:- Cement bags =(1.52 X 1)/(1+1.5+3)X0.035

            Cement bags =7.89 bags.
 Similarly sand required will be 1.5 times of

(dry density X volume of concrete)/(sum of ratio)

so sand required= 1.5X((1.52 X 1)/(1+1.5+3))=0.414 M3
            1Brass=2.83 M3
            therefore,sand in brass=0.414/2.83= 0.146 brass.

 Similarly Aggregate required will be 3 times of

(dry density X volume of concrete)/(sum of ratio)

so Aggregate required= 3 X((1.52 X 1)/(1+1.5+3))=0.829 M3
            1Brass=2.83 M3
            therefore,sand in brass=0.829/2.83= 0.292 brass.