Bricks Calculator
Estimate how many standard bricks you need for a wall from its length, height, and thickness. The calculator uses the common figure of about 13.5 bricks per cubic foot (for a 9×4.5×3 inch brick with mortar) and adds a 5% wastage allowance.
- Standard brick ~9"×4.5"×3" with mortar (~13.5 bricks/cft).
- 5% wastage added; openings (doors/windows) are not deducted.
Formula
Bricks = Length × Height × Thickness × 13.5 × (1 + wastage)
- Wall volume = length × height × thickness, all in feet, giving cubic feet of brickwork.
- Multiplying the volume by ~13.5 gives the number of standard bricks, since one cubic foot holds about 13.5 bricks with mortar.
- A 5% wastage allowance is added on top to cover breakage and cutting.
- Thickness options correspond to a full 9-inch brick wall (0.75 ft) or a half 4.5-inch wall (0.375 ft).
- Openings such as doors and windows are not deducted — subtract their volume separately for large gaps.
20 ft × 10 ft full-brick wall
Inputs
- Wall length: 20 ft
- Wall height: 10 ft
Wall area = 200 sq ft, volume = 200 × 0.75 = 150 cu ft. Bricks = 150 × 13.5 ≈ 2,025, plus 5% wastage ≈ 2,127 bricks.
Frequently asked questions
How many bricks are in a cubic foot?
For a standard 9×4.5×3 inch brick laid with mortar, roughly 13.5 bricks fill one cubic foot of wall.
What's the difference between a full and half brick wall?
A full (9-inch) wall is one brick thick and load-bearing; a half (4.5-inch) wall is thinner and used for partitions. Thickness changes the volume and brick count.
Why add wastage?
Bricks break during transport and cutting, so a small wastage allowance (here 5%) helps ensure you order enough.
Are openings deducted?
No. Doors and windows are not subtracted automatically. For large openings, calculate their volume and deduct the bricks separately.
Does brick size affect the result?
Yes. The 13.5-per-cubic-foot figure assumes a standard brick. Non-standard sizes will change the count.
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