How to Calculate Cement and Sand Quantity for Plastering

Hello Engineers, Today we will Calculate Cement and Sand Quantity for plastering work. Before calculation, We should be know some values that’s given bellow :-

Note:- Point Should Be Know, Before Estimating Mortar Calculation for Plastering work

Density of Cement	1440 kg/m3
Density of Sand	1450-1550 kg/m3
How many kg in 1 bag of cement	50kg
Volume of one cement bag in litres	34.4722 litres
One Bag of cement in cubic metres	0.0347 cubic meter
How many Cubic Feet (CFT)	1.226 CFT
Numbers of Bags in one cubic metre cement	29 bags approx.
Specific gravity of cement	3.5
Grade of cement	33, 43, 53

We take a wall that’s

Area of brick wall for plaster = 3m x 3m = 9m²

Thickness of Plaster = 12mm (Inner Plaster) = 0.012m

Volume of mortar = 9m² x 0.012m = 0.108m³

Ratio for Plaster = 1:6

Sum of ratio = 7

Cement Calculation of mortar

Volume ( Dry Volume of Mortar ) = 0.108 x 1.35 = 0.1458 m³

Cement = cement part / sum of ratio x Cement Volume ( Dry Volume of Mortar )

Cement= (1/7) x 0.1458 = 0.0208 m³

Cement = 0.0208 x 1440 (Density of Cement is 1440/m3)

Cement = 29.99 kg

A wall that dimensions 3mtr x 3mtr and 12 mm thickness of plaster require 29.99 kg cement.

If you want know quantity in bags, Than we know in one bag quantity is 50 kg

(29.99/50) = 0.599 Bags

Sand Calculation of mortar

Volume of Sand = (6/7) x 0.1458

Volume of Sand= 0.124m³

Sand = 0.0208 x 1450 (Density of Sand is 1450/m3)

Sand = 181.2 kg

A wall that dimensions 3mtr x 3mtr and 12 mm thickness of plaster require 181.2 kg sand.

Important Point :- The value of various materials like cement, sand, aggregates can be different, but its will a minor difference because density can be change according to zones of all over world. But standard formulas explained in this article.

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