Calculation of Cement and sand for Wall Plaster

Hello guys, Welcome to my blog. Today we will discuss the Calculation of Cement and sand in Wall Plasterwork. So guys till the end visit this page. I hope you are happy after seeing it.

So I am talking about the outer part of the building plaster. Please, friends, this is the most important thing to know about engineers and contractors on the building construction site.

This is most important to calculate the number of materials (sand, cement, and water) for building Plastering work. Without calculation, we cannot order the required materials for the site. So this is very necessary to calculate the quantity of sand, and cement.

Calculation of Cement and sand
Calculation of Cement and sand for Wall Plaster

Important points for Calculation of Cement and sand

First of all, you know the following points,

The density of Cement = 1440 kg/cub m.

The density of sand = 1450-1500 kg/cub m.

Density of Aggregate = 1450- 1550 kg/cub m

Thickness of Plaster=20 mm [interior wall=12 mm/ exterior wall=20 mm]

So let’s get started;

So, first of all, we supposed all the dimensions where we go to plaster over the wall. That is plasterwork on the wall.

Let us Consider,

Length of the wall (L)= 10 meters
Height of wall (H)= 10 meters
The thickness of Plaster ( t ) = 20 mm

The thickness of plaster in the internal phase is 12 mm
The thickness of plaster in the external phase is 19 mm to 20 mm.
However, we used 20 mm thick plaster for the calculation of cement and sand in plaster.

Also, the ratio of cement: sand =1:6 or 1:5 for plaster.
We can take cement and sand ratio =1:6

Calculate the area of the wall for Calculation of Cement and sand

First of all, calculate the area of the wall
Area (A)= L × H =10 × 10 = 100 sq m.

Calculate Volume of mortar [WET]= Area × thickness of plaster
=2 cub meter

Area Adding wastage

So we need to add 20% for wastage, fillings void, frogs of brick, joints, and depressions.

Consider, adding 20 % of the WET Volume of Mortar,
=Wet volume +(20% of Wet volume)
=2 cub m + (20%×2)
=2 + 0.4
=2.4 cub m

Add 33% for dry volume
Consider, 33% for dry volume
=2.4 + (33% of 2.4)
=2.4 + 0.792
=3.192 cub m [dry volume]

Dry Volume of mortar =3.192 cub m

We know,
The ratio of cement and sand = 1:6
The sum of the ratio of cement and sand =1 + 5=6

Quantity of cement in bags

Now we can calculate the cement Quantity in the bag.
So, Cement = (total dry volume of plaster ÷ sum of ratio) × cement portion × dry density of cement
Or, Cement = (3.192÷7) ×1 × 1440 kg/cub m.
Cement = 0.456 × 1440
Cement =656.64 kg.

Note: 50 kg cement = 1 bag of cement.

According to the note,
Cement in bag= 656.64 ÷ 50
Cement in bag = 13.13 bag.

That is we need about 13 bags of cement for 100 sq m of wall plaster.

Calculate the amount of sand

Calculate the amount of sand,
Sand = (3.192÷7) × 6 in cub m
Sand = 2.736 cub m.

If you can calculate cub ft multiplying sand in cub m and 35.3147.

That is, a
volume of Sand = 3.192 ×35.3147
The volume of Sand= 112.724 Cub ft.

An alternative way to calculate Sand in a cub ft.

Quantity of Sand= Qty of cement × sand ratio × 1.226
=15.32 × 6 × 1.226
= 112.693 cub ft.

Calculation of Cement and sand for Wall Plaster

You can see the pictures of the unit converted from cub m to cub ft.

From the site experiment, we have to increase the 8% bulking of sand
Sand =112.72 + (8÷100) × 112.72
Sand = 121.736 cub ft.

The amount of sand for plaster 100 sq m wall is 121.736 cub ft.

Calculation of Water

let us, water: cement=0.45,
friends the water-cement ratio is not used more than 0.45

Quantity of Water= (water/cement) × cement in kg
Quantity of Water= 0.45 × 656.64
The quantity of water is 295.49 kg or 295.49 liters.
so the quantity of water to plaster a 100 sq m wall in a 1:6 cement sand ratio is 195.49 kg.


The quantity of cement, sand, and water for 100 sq m wall plaster in a building is in a 1:6 ratio.
Cement =656.64 kg.
Cement in bag = 13.13 bag.
Sand = 2.736 cub m.
Sand = 121.736 cub ft.
Water= 295.49 kg

So guys this is the process of calculation of cement and sand for 100 sq m wall plaster in a 1:6 ( cement: sand) ratio. I hope you guys this is an informative blog for you. if you like please share the post with your friends. Thanks for visiting the blog.

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