Brick Wall Calculator
Pick a wall thickness, enter length and height, deduct openings, and get brick count plus mortar volume.
Inputs
Result
Formula
| Bricks per m² | N = 64 × number of wythes |
| Wythes | 115 mm wall = 1, 240 mm = 2, 365 mm = 3, 490 mm = 4 |
| Wall area | A = length × height − openings |
| Total bricks | N_total = A × N × (1 + waste %) |
| Mortar | V = A × thickness × 0.26 |
10 m × 3 m wall, 240 mm thick, 4 m² of openings: 26 m² of masonry, 128 bricks/m² → 3,328 net, 3,428 with 3% waste, about 1.62 m³ of mortar.
Bricks and mortar per square metre by wall thickness
| Thickness | Wythes | Bricks per m² | Mortar per m² (m³) | Typical use |
|---|---|---|---|---|
| 115 mm wall | 1 | 64 | 0.030 | Partitions, balcony upstands |
| 240 mm wall | 2 | 128 | 0.062 | Load-bearing walls, most common |
| 365 mm wall | 3 | 192 | 0.095 | Insulated external walls, fire walls |
| 490 mm wall | 4 | 256 | 0.127 | Heavy load-bearing, heritage work |
FAQ
Where does 64 bricks per m² come from?
A standard brick is 240×115×53 mm with a 10 mm joint. Each brick occupies (240+10)×(53+10) = 250×63 mm on the wall face, so 1,000,000 ÷ 15,750 = 63.5, rounded to 64. That is one wythe; a 240 mm wall has two, giving 128.
What about perforated bricks or AAC blocks?
Recalculate with the actual unit size: bricks per m² = 1,000,000 ÷ [(length+joint) × (height+joint)]. AAC blocks are commonly 600×200×200 mm, giving about 8.3 units per m² for a 200 mm wall, with much less mortar because thin-bed adhesive is only 3-5 mm.
Should openings, tie columns and ring beams be deducted?
Openings yes. Tie columns, ring beams and lintels also occupy volume and should be deducted, otherwise you over-order. Typical rules ignore openings of 0.3 m² or less. This tool deducts openings only, so subtract structural concrete separately if needed.
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Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.