Brick Calculator
Number of bricks or blocks for a wall area, counting the mortar joint.
Results
Quantity
1245
Quantity
59.3
What this tool does
The joint counts as part of each brick's footprint, which is why a 215 mm brick with a 10 mm joint occupies 225 mm of wall. The defaults are a standard UK brick; change them for blocks or for metric formats.
Formula
n = area ÷ ((c + joint) × (a + joint)) × (1 + waste)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
a | Area | m² |
bl | Length | mm |
bh | Height | mm |
j | Joint width | mm |
wa | Waste allowance | % |
N | Quantity | — |
PM | Quantity | — |
Worked example
- Area20 m²
- Length215 mm
- Height65 mm
- Joint width10 mm
- Waste allowance5 %
- Quantity1245
- Quantity59.3
Limitations
- Always order a little more material than the calculated quantity. Cuts, breakage and pattern matching create waste that depends on the shape of the job.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.