Thumb rule - How to calculate the number of Bricks per Square meter (m2) - LCETED - LCETED - LCETED Institute for Civil Engineers

## Feb 4, 2022

In this article, we explained about thumb rule calculation for brickwork and bricks needed for Square meter – Sq/m, before we are going to calculation we have to know the size of the brick to proceed further

SIZE OF THE BRICK

Generally, four standard-sized bricks are used in India.

Which are,

Modular Brick / Metric Bricks – 190 x 90 x 90 mm or 7.48” x 3.54” x 3.54” These are machine-made bricks

Non-Modular Bricks – 230 mm x 110 mm x 70 mm or 9″ x 4.33″ x 2.75″

Conventional Bricks – 230 x 110 x 110 mm or 9″ x 4.33″ x 4.33″

English Size Bricks – 230 x 115 x 75 mm or 9″ x 4.5″ x 3″. (It is usually used in India.)

There are other dimensions depending on the country. The brick weight must not exceed 3 kg.

In this calculation, we will use the English Bricks size

Let’s start,

Thumb Rule for Brick Calculation Per Square Meter/Sqm

(OR)

How to calculate the number of Bricks per Square meter (m2)

4″ brick wall or single layer or half brick

Size → 230mmx110mmx75 mm (0.230×0.110×0.075 m)

Thickness of mortar = 10 to15mm (0.01m)

By adding the thickness of the mortar

Length of Bricks in meter (L) = 230mm + 10mm = 240mm - 0.240m

Width of Bricks in meter (W) = 110mm + 10mm = 120mm - 0.110m

Thickness of Bricks in meter (T) =75 mm + 10mm = 85mm - 0.085m

Size of the brick with mortar → 240mmx120mmx85 mm (0.240×0.120×0.085) mm

No. of bricks in 1sq.m = Area of brickwork/ Area of one brick with mortar.

Or

No. of bricks in 1sq.m = Volume of brickwork/ Volume of one brick with mortar.

Area of a brick = Length of brick x Width of brick

Area of each Brick in square meter = L x W = 0.240 x 0.085 = 0.0204 sqm

Therefore,

No. of bricks in 1 sq.m = 1/0.0204 = 49.019 – 50nos

Consider the wastage percentage as 10% of bricks we will add 5 nos with the total

No. of bricks in 1sq.m = 50 + 5 = 55nos/sqm

Then,

No. of bricks with wastage per square meter = 55nos/m2

Thus, thumb rule formula:

How many bricks are in sqm?

No. of bricks in 4″ (half brick wall, single brick) wall per m2 = (Area in sqm × 55).

9″ brick wall or double layer

No. of bricks with wastage per square meter for 4” wall= 55nos/m2

Therefore,

How many bricks are in 1sqm?

No. of bricks with wastage per square meter for 9” wall= 55nos/m2 = 2 x 55 = 110nos (as the 9” twice the thickness of the 4” wall)

How to Use This Thumb Rule?

Let’s explain

Given data:

Size of the 4” brick wall = 3x3m

Area of the brick wall = 3x3 = 9sqm

No. of bricks in 4” wall per m2 = (Area in sqm × 55).

Therefore,

No. of bricks in 4″ wall of 9m2 = 9 x 55 = 495nos

If you find

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