How To Calculate Quantity of Cement and Sand in Plaster

Following points should be remembered while calculating the quantity of cement, sand for plastering work.

1. For wall plastering, Cement : Sand = 1 : 6

2. For ceiling plastering, Cement : Sand =  1 : 4

3. Thickness of plaster should be in between 12-15 mm. If an additional coat is required then do not do it at one go.

4. Use good quality of cement & Sand.

5. Use measuring box (not head pan) for site mix.

We will calculate cement and sand for 100 m2 plastering area in 1:6 ratio and thickness of 12 mm.

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 of cement mortar (after mixing water) but we need dry volume. To get dry volume consider 35% bulking of sand and 20% wastages

= 1.2 mx (1+0.2+0.35) (Rather than 35% sand bulkage and 20% wastage you can add 1.54 as constant)

= 1.86 m3

Cement : Sand = 1 : 6

Sum of ratio =( 1 + 6) = 7

Cement required

= 1.86 x 1/7

= 0.265 m

= 0.265/0.0347 ( 0.0347 m3 = 1 bag  = 50 kg cement)

= 7.66 bags (8 Bags)

Sand required

= 1.86 x 6/7

= 1.59 m3

Here we have calculated in Sq.m but you can also calculate it in Sq.ft.

 

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