Brick Calculator

How it works

How to use the brick calculator

Brickwork quantity starts with wall volume: length × height × thickness, minus doors and windows. Each brick plus its mortar joint occupies a slightly larger block, so the number of bricks is the wall volume divided by that block. For modular 190 × 90 × 90 mm bricks with 10 mm joints, that's about 500 bricks per cubic metre.

The space left over is wet mortar. Because dry cement and sand shrink when water is added, dry volume is taken as about 1.33 × wet volume, then split by your mix ratio: 1:6 for most 9-inch walls, 1:4 for 4.5-inch partition walls. One 50 kg cement bag is about 0.0347 m³. A wastage allowance (5% by default) covers broken bricks and spillage.

These are standard site thumb rules for planning and comparing quotes. Actual consumption depends on brick quality, joint thickness and workmanship, so order with a margin and confirm with your engineer or contractor.

1. Enter wall length and height in metres.
2. Choose thickness, brick size and mortar mix.
3. Subtract door and window area and set wastage.
4. Read bricks, cement bags and sand.