Brick Calculator for 4.5 inch and 9 inch Walls
Enter the wall length and height, pick 4.5 inch or 9 inch thickness and the brick size. You get the number of bricks with wastage, and the cement and sand for the mortar.
- Nothing you type is stored
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Bricks needed
1,575
- Wall area
- 15 m² · 161.5 sq ft
- Cement for mortar
- 4 bags
- Sand
- 0.79 m³ · 27.8 cft
- Mortar (wet)
- 0.69 m³ · 24.4 cft
Estimate only, based on standard thumb rules. Confirm quantities with your engineer or contractor before you buy.
Show working
- A = 5 × 3 = 15 m²
- V = 15 × 0.2 = 3 m³
- 200 × 100 × 100 mm = 0.002 m³ → 3 ÷ 0.002 = 1,500
- 1,500 × 1.05 = 1,575 → 1575
- Mortar = 3 − 1,500 × 0.001539 = 0.692 m³ × 1.33 = 0.92 m³
How to use
- Enter wall length and height in metres or feet.
- Pick wall thickness, brick type and deduct door/window openings.
- Set wastage and mortar ratio to see bricks, bags and sand.
Good to know
The modular brick in IS 1077 is 190 × 90 × 90 mm; with 10 mm mortar joints it takes 200 × 100 × 100 mm, so 1 m³ of brickwork holds 500 bricks. A 9 inch (one brick) wall needs 100 bricks per m² of face and a 4.5 inch (half brick) wall needs 50. Traditional 230 × 110 × 70 mm bricks give about 104 and 52.
Mortar is the wall volume minus the bricks’ own volume: about 0.23 m³ per m³ of modular brickwork. Dry mortar = wet × 1.33, and cement and sand follow the ratio: 1:6 is usual for 9 inch walls and 1:4 for 4.5 inch partition walls.
Add 5–10% wastage for broken bricks and cutting. Brick sizes vary between kilns, so measure a few of your bricks; if they are bigger or smaller the count changes. This is an estimate for ordering, not a structural design.
Questions
How many bricks in 1 square foot of 9 inch wall?
With modular bricks about 9.3 (100 per m²); with traditional 230 mm bricks about 9.7. Add wastage on top.
How many bricks in 1 cubic metre?
500 modular bricks (190×90×90 mm with 10 mm joints). Traditional 230×110×70 mm bricks: about 434.
Which mortar ratio for brickwork?
1:6 (cement:sand) for 9 inch load-bearing or outer walls is common; 1:4 for half-brick partition walls, which need more strength per brick.
Should I deduct doors and windows?
Yes. Enter the total opening area; lintels and sills are usually counted separately.
Is this exact?
No. Joint thickness, brick size and breakage on site change the count. Order a little extra and confirm with your mason.