Free calculator
Brick and block calculator
Calculate how many red bricks or concrete blocks you need to build a wall, based on the area in square meters, plus an estimate of the joint mortar.
Units needed (includes 5% waste)
1,365 pcs
Joint mortar (approx.)0.40 m³
Includes a suggested 5% waste. Units per m² change with the bond pattern and the joint thickness.
How it’s calculated
Units = wall area (m²) × units per m². Red brick (6×12×24 cm) ≈ 65 units/m² (stretcher bond); block (15×20×40 cm) ≈ 12.5 units/m². Joint mortar ≈ 0.02 m³/m².
app.matterial.ai / takeoff
Takeoff from drawing
Detected · AIplan.dwg · 320 m²
| Material | Unit | Quantity |
|---|---|---|
| Concrete f'c=250 | m³ | 148.5 |
| Rebar | ton | 12.4 |
| Standard formwork | m² | 620 |
| Block wall | m² | 385 |
| Concrete slab-on-grade | m² | 210 |
What if, instead of calculating by hand, Matterial pulled the quantities straight from your plans? Explore Estimating →
Frequently asked questions
How many red bricks fit in a square meter?
With a 6×12×24 cm brick laid in stretcher bond, around 65 units fit per m² of wall, joint included.
How many blocks go in a square meter?
With a 15×20×40 cm block, roughly 12.5 units fit per m² of wall.
Should I account for waste?
Yes. It is recommended to add 5% for broken units and cuts; the calculator already includes it in the total.