Brick Wall Calculator
Pick a wall thickness, enter length and height, deduct openings, and get brick count plus mortar volume.
Quick answer
With the default inputs: Wall length 10 · Wall height 3 · Wall thickness 24 cm wall etc.Bricks required (incl. waste) 3,428 blocks
Edit the inputs below to recalculate.Inputs
Result
Bricks required (incl. waste)
3,428blocks
| Wall area | 26.00m² |
| Bricks per m² | 128blocks |
| Net bricks | 3,328blocks |
| With waste | 3,428blocks |
| Masonry volume | 6.24m³ |
| Mortar volume | 1.62m³ |
| Cement (32.5) | 373kg |
| Sand | 1.65m³ |
Standard bricks 240×115×53 mm with 10 mm joints; mortar assumed to be M7.5 cement mortar.
Reverse: known result, work out one input
Enter a target result; the other inputs stay fixed and this one is worked out.
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 |
How to work it out
- Fix the unit: standard brick 240×115×53, or the actual dimensions of perforated, hollow or AAC block.
- Fix wall thickness and bonding: 120 / 180 / 240 / 370 / 490 mm, which sets the count per cubic metre (529 in a 240 mm wall, 552 in a 120 mm wall).
- Take the net wall volume: length × height × thickness, less openings, tie columns, ring beams and lintels.
- Multiply by the count per cubic metre, then by one plus waste.
- Compute mortar separately from the net quantity per cubic metre — never use one-minus-brick-volume directly as consumption.
Where it goes wrong
- Entering 180 mm but using 240 mm counts — 535 versus 529 per m³ looks trivial until it is multiplied by thousands of cubic metres.
- Forgetting tie columns and ring beams — secondary structure is 5-10% of the wall volume, so leaving it out buys a tenth too many bricks.
- Taking mortar as the volume difference — that is net only, and joint fill adds another 5%.
Material and cost
Fired clay bricks run about 0.40-0.60 each with strong regional and haulage variation; AAC block is roughly 220-320 per m³. Laying labour is typically 180-280 per m³ of wall. Breakage is usually carried at 1-2%, rising to 3% on high-rise jobs with double handling.
On site
- Measure twenty bricks on delivery — a 2 mm length deviation changes the count per cubic metre.
- Wet the bricks the day before laying; dry bricks draw water out of the mortar and lose both strength and bond.
- Leave toothing at tie columns and build the wall before pouring the column, measuring the actual laid area rather than the full wall.
Basis
- GB 50203-2011 Code for acceptance of masonry construction (bonding and 8-12 mm joints)
- GB 50003-2011 Code for design of masonry structures
- GB/T 5101-2017 Fired common bricks (nominal 240×115×53)
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.
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Brick Wall Calculator. 2026-10-25. https://jianzhujisuan.com/en/brick-count
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.