About brick calculator
The number of bricks for a wall depends on its size and the brick and mortar dimensions.
Method
Wall volume ÷ volume of one brick with mortar. A standard modular brick is about 190 × 90 × 90 mm, or 200 × 100 × 100 mm with mortar. A wall of 10 m² in 100 mm thickness needs about 500 bricks.
Remember
- Subtract door and window openings.
- Allow about 5 percent for breakage.
- Mortar quantity is roughly 25 to 30 percent of the wall volume.
Always add a margin
These are planning estimates. Real quantities depend on site conditions, brands and wastage, so confirm with your contractor or supplier before ordering.
A worked example
A wall 3 m long and 2.5 m high in 100 mm thickness has a volume of 0.75 m³. A brick with its mortar joint measures about 0.2 × 0.1 × 0.1 m, or 0.002 m³, so you need about 375 bricks. Adding 5 percent for breakage gives about 394.
Wall thickness
A 100 mm wall uses a single brick on its side, while a 230 mm wall uses a full brick length and needs about twice as many bricks per square metre. Confirm the thickness your design needs with the engineer.
