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Block Calculation

Calculate of Number Of Concrete Blocks for Construction
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Cement or concrete blocks are available in several sizes and many shapes, and have a wide range of physical properties. T

Calculating the quantity of blocks, There are several methods for calculating number of blocks in a wall. In this article, I will explain two simple methods to find out total no. of blocks for a wall.

Calcualtion
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1:
Determine The Length & Height Of The Wall:
Let, the Length of the wall = 10 feet.
The height of the wall = 10 feet.

2:
Calculate The Surface Area Of The Wall:
We know, Surface Area = Length x Height
∴ Surface area of the wall = 10 x 10 = 100 sq. feet.

3:
Calculate The Surface Area Of Openings:

If the wall has any openings such as door, windows etc, calculate the surface area of openings.
Let the wall has a window of 3′ x 3′
∴ Surface area of the window = 3 x 3 =9 sq. ft

4:
Substract The Surface Area Of Openings From Surface Area Of Walls:
∴ Final Surface Area of wall = 100 – 9 = 91 sq.ft.

5:
Calculate The Surface Area Of A Concrete Block With Mortar Allowance:
Let the block is 16″ x 8″ x 8″ and mortar allowance is 1″
∴ Surface Area of one block with mortar = length * height = (16+1) x (8+1)= 153 inch²
= 153/12×12 = 1.0625 sq.ft

6 :

Divide The Total Surface Area Of The Wall By Surface Area Of One Block:

∴ Number of blocks = Surface Area of wall/Surface Area of a block = 91/1.0625 = 86

Consider 5% wastage of concrete blocks.

So the total numbers of blocks required = 86 + (86 x 5/100) = 86 + 4 = 90.

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