How to calculate cement, sand quantity for Plastering?



 General  things of Plastering

  • Cement Mortar Ratio for wall plastering 1:6
  • Cement Mortar Ratio for ceiling plastering 1:4
  • Plastering thickness should not be more than 12-15 mm. If there is a need for an additional coat don’t do that at one go.
  • Ensure you are using good quality of cement & Sand 
  • Also, ensure you are using measuring box (not head pan) for site mix. 

Plastering Work Ratio Calculation

We are going to do this calculation for 100 m2 area.

To calculate the cement and sand for 100 m2 plastering area in 1:6 ratio and 12 mm thickness.

Cement Mortar Required:

Plastering thickness 12 mm            = 12/1000 = 0.012m

Volume of cement mortar required = ( Plastering Area x thickness )

                                                         = 100 m2 x 0.012m = 1.2 m3

(This is wet volume that means we need this much volume of cement mortar after mixing water, So for dry volume, we have to add 30-35% as bulkage of sand, we are using 35% and wastage as 20%)

Consider 35% Sand Bulkage     = 1.2 m3 x (1+0.2+0.35) (Many of us would use 1.54 as constant)

                                                   = 1.86 m3

              Cement : Sand (Ratio) = 1 : 6 ( Total = 1+6 = 7 Parts )

                  Cement required (1 Part) = 1.86 x 1/7

As mentioned above volume of 1 bag of cement (50kgs) = 0.0348m3

                                                                = 0.265 m3X 50/0.0348

                                                                =380 Kg

                                                                = 7.6 bags (Approx – 8 Bags)

                        Sand required (5 Part) = 1.86 x 6/7

                                                                = 1.59 m3

                                       For Sand 1m3 = 1600Kgs, 1.59 X 1600

                                                                =2544 Kgs (2.5 Tonnes)

Amount of water to be added in mix depends upon the moisture content present in cement, sand & atmosphere.

                                Quantity of water = 20% of total dry material (Cement+Sand)


                                                                    = 20% of (380+2544)

                                                                    = 0.2 x 2924

                                                                    = 584 litres.

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