**Thumb rule - How to calculate the number of Bricks per
CFT – LCETED**

** **

In this article, we explained about thumb rule calculation for brickwork
and bricks needed for Cubic feet – CFT, 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** – 7.48” x 3.54” x 3.54” or
190 x 90 x 90 mm (These are machine-made bricks)

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

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

**English Size Bricks** – 9″ x 4.5″ x 3″ or 230 x 115 x 75 mm (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 CFT**

**(OR)**

**How to calculate the number of Bricks per Cubic Feet (CFT)**

** **

**4″
brick wall or single layer or half brick**

*Inches
to Feet (into ft) = divide the length value by 12*

Size of brick without mortar → 9″/12 × 4.5″/12 × 3″/12 =
0.75’×0.375’×0.25’

Volume of brick with mortar = 0.75’×0.375’×0.25’ = 0.0703 cft

**The thickness of mortar** = 0.4” to 0.6”

By adding the thickness of the mortar

Length of Bricks in meter (L) = 9” + 0.4” **= 9.4” - ****0.783’**

Width of Bricks in meter (W) = 4.5” + 0.4” **= 4.9” - 0.4083’ **

Thickness of Bricks in meter (T) = 3” + 0.4” **= 3.4” - 0.283’**

** **

**Size of the brick with mortar**** in feet **→ 0.783’ x 0.4083’ x 0.283’

** **

**No. of bricks in 1 cubic Feet (cft) ****= Volume of
brickwork/ Volume of one brick with mortar.**

** **

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

** **

The volume of a brick = Length of brick x Width of brick x depth of the brick

Volume of each Brick in CFT= L x W x H **= 0.783’ x 0.4083’ x 0.283’
= 0.09047 cft**

** **

**Therefore,**

**No. of bricks in 1 Cft = 1/0.09047 = 11.053 – 12nos**

** **

Consider the wastage percentage as 10% of bricks we will

** **

**No. of bricks in 1cft = 12 + 10% = 13.2nos/cft**

** **

**Then,**

**No. of bricks with wastage per cubic feet= 13.2 – 14nos/cft**

** **

**Thus, thumb rule formula:**

**No. of bricks in wall per Cubic Feet= (Area in Cft × 14).**

** **

** **

**How to Use This Thumb Rule?**

Let’s explain,

**How many bricks are there in 100cft?**

**Given data:**

Area of the brick wall = 100cft

No. of bricks in wall per Cft= (Area in cft × 14).

** **

**Therefore,**

No. of bricks in wall per 100 Cft = 100 x 14 **= 1400 nos**

** **

**How many bricks are there in 10’x 10’?**

Size of the 9” brick wall = 10’ x 10’

The thickness of the wall = 9”/12 –
0.75’ (breadth)

Area of the brick wall = 10 x 10 x
0.75 = **75 cft**

No. of bricks in wall per Cft = (Area in cft × 14).

No. of bricks in wall per Cft = 75 x 14 =1050nos

** **

If you find

This information is helpful, please
share it.

**Thanks!** For reading the article...** **

** **

Area in cft ?

ReplyDelete