Brick Calculator (bricks for a wall)
Enter wall length, height and thickness (9 inch or 4.5 inch) to get the number of bricks instantly, with wastage.
Quick answer
20 × 10 ft, 9 inch wall: about 2,230 bricks.
How it is calculated
- Wall volume = length × height × thickness = 20 × 10 × 0.75 = 150 cu ft.
- Convert to m³ (÷ 35.31) and multiply by about 500 bricks per m³ including mortar.
- Add the wastage percent.
Worked example
A wall 20 ft long, 10 ft high and 9 inch thick has a volume of 150 cft. With 5% wastage you need about 2,230 bricks.
| Wall length | 20 ft |
| Wall height | 10 ft |
| Thickness | 9 inch |
| Wastage | 5 % |
| Bricks | 2,230 |
| Wall volume | 150 cft |
Formula
Modular brick 190×90×90 mm, ~500 per m³ with mortar
cft = Ln×Ht×Th Bricks = ceil(cft/35.3147×500×(1+Wa/100)) Wall volume = cft
Good to know
- Subtract the area of doors and windows.
- Larger local bricks need fewer; this uses modular bricks.
Questions people ask
How many bricks in 1 cu ft?
About 14 modular bricks including mortar.
Bricks for a 100 sq ft, 9 inch wall?
About 1,060 plus wastage, roughly 1,100.
Does it include mortar cement?
No, it counts bricks only. Work out mortar separately with your contractor’s mix.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0