Brick, Mortar & Masonry Block Estimator
Enter wall dimensions, deduct door and window openings, and get the brick count plus cement and sand needed for the mortar.
How material quantities are derived
A 6m × 3m wall, 230mm thick, with 4m² of openings
Gross wall volume is 6 × 3 × 0.23 ≈ 4.14 m³. Subtracting 4 m² of openings (× 0.23m thickness ≈ 0.92 m³) and adding 5% wastage gives a net volume of about 3.38 m³. Using modular bricks with a 10mm joint, that works out to roughly 1,660 bricks, with the leftover mortar volume split across a 1:6 cement:sand ratio to about 6.4 bags of cement and 490 kg of sand.
| Material | Quantity |
|---|---|
| Bricks | ≈ 1,660 pieces |
| Cement | ≈ 6.4 bags |
| Sand | ≈ 490 kg |
Common questions
It divides the net wall volume (after deducting openings) by the volume of a single brick plus the mortar joint that surrounds it on the length, width, and height sides. That "brick + mortar" volume is larger than the brick alone, since the mortar joint takes up space too — dividing by it directly gives the number of bricks that fit, and the mortar volume is calculated separately as the leftover space between bricks.