HOW TO CALCULATE CEMENT BAGS IN 1 CUBIC METER

PROCEDURE TO CALCULATE CEMENT BAGS IN 1 CUBIC METER:

Let us consider the nominal mix is 1:2:4

Loss of cement is considered as 2%

Output of mix is considered as 67%

To achieve 1cum output, we need 1/0.67 = 1.49 say 1.50 cum dry mix.
      
Now add wastage of 2%, i.e (1.50 + 0.02) = 1.52 cum.

Volume of cement = (Cement / Cement+Sand+Aggregate) x Total material 
                = (1 /1+2+4) x 1.52
                = 0.2171 cum

As we know, the density of cement is 1440 kg/cum and 

Weight of 1 bag cement = 50 kg.

Therefore Volume of 1 bag cement = (Weight of 1 bag cement / Density of cement)
                                                        = 50 / 1440 = 0.0347 cum.

∴ No. of cement bags required in 1 cubic meter = 0.2171 / 0.0347 = 6.25 bags.

Note: You can use the same formula for calculating cement for other nominal mixes.