**Thumb rule - How to calculate the number of Bricks per Cubic
meter (Cum) – LCETED**

** **

In this article, we explained about thumb rule calculation for brickwork
and bricks needed for Cubic meter – cum, 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 Cubic meter**

**(OR)**

**How to calculate the number of Bricks per Cubic meter (cum)**

** **

**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 1 cubic meter (cum) ****= Volume of
brickwork/ Volume of one brick with mortar.**

** **

Volume of brickwork = (Length x Width x depth) of the wall = 1 x 1 x1 =
1cum (to have find per cum)

** **

Volume of a brick = Length of brick x Width of brick x depth of brick

Area of each Brick in Cum= L x W x H **= 0.240×0.120×0.085
= 0.002448cum**

** **

**Therefore,**

**No. of bricks in 1 Cum = 1/0.002448= 408.496 – 410nos**

** **

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

** **

**No. of bricks in 1cum = 410 + 10% = 451nos/cum**

** **

**Then,**

**No. of bricks with wastage per cubic meter = 451nos/cum**

** **

**Thus, thumb rule formula:**

**How many bricks are in 1cum?**

**No. of bricks in wall per Cubic meter**^{ }**= (Area in Cum × 451).**

** **

** **

**How to Use This Thumb Rule?**

Let’s explain

Given data:

Size of the 9” brick wall = 3x3m

The thickness of the wall = 9” – 230mm (breadth)

Area of the brick wall = 3 x 3 x 0.230 = **2.07 sqm**

No. of bricks in wall per Cum= (Area in cum × 451).

** **

**Therefore,**

No. of bricks in wall per Cum = 2.07 x 451 **= 933.57nos**

Also read: Thumb rule - How to calculate the number of Bricks per Square meter (m2) - LCETED

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