Brick Calculator

How the Brick Calculator works

The brick calculator estimates the number of bricks, cement bags, and sand quantity needed for any wall. Enter wall length, height, and thickness, then select brick size and mortar joint width. The tool applies the correct bond pattern geometry and a standard 5–10% wastage factor so your materials order is accurate before work begins.

Standard Indian brick size

The IS 1077 standard modular brick in India measures 190×90×90 mm nominal (with mortar) or 190×90×90 mm actual — roughly 230×115×75 mm including a 10 mm mortar joint on all faces. A standard 230 mm (9-inch) brick wall in stretcher bond uses approximately 48 bricks per square metre, while a 115 mm (4.5-inch) partition wall uses about 55 bricks per square metre.

Bond patterns

Stretcher bond (bricks laid lengthwise) is used for 115 mm half-brick partition walls. English bond and Flemish bond alternate header and stretcher courses for full-brick 230 mm structural walls. English bond uses slightly more bricks than Flemish bond. The calculator adjusts the brick count per square metre based on the selected bond pattern to reflect true material usage.

Mortar joint and mix ratios

A standard 10 mm mortar joint is used for most brickwork. The mortar volume in a wall typically accounts for 25–30% of total volume. For general brickwork, a 1:6 cement-sand mix is common; for load-bearing walls a richer 1:4 mix is recommended. The calculator converts mortar volume to bags of cement (50 kg) and sand (in cubic feet or cubic metres) at your chosen mix ratio.

Wastage and ordering buffer

Standard wastage for brickwork is 5% for experienced masons on straightforward walls, rising to 10% for walls with many openings, curves, or complex patterns. The calculator adds your chosen wastage percentage to the theoretical brick count and rounds up to the nearest full delivery unit, preventing costly mid-project reorders and ensuring a small on-site reserve.

Frequently asked questions

How many bricks per square metre?

For a standard Indian modular brick (230×110×75 mm) laid with 10 mm mortar joints in a one-brick thick (230 mm) wall, approximately 60–65 bricks are required per square metre of finished wall face area. For a half-brick (110 mm) partition wall, approximately 55–60 bricks are needed per square metre.

How is brick quantity calculated?

The number of bricks per cubic metre is calculated as: 1 divided by [(brick length + mortar joint) × (brick height + mortar joint) × (brick width + mortar joint)], all in metres. For example, with 230×75×110 mm bricks and 10 mm joints: 1 / (0.24 × 0.085 × 0.12) ≈ 408 bricks per m³. Multiply by the wall volume to get the total brick count before adding wastage.

What wastage factor should I use for bricks?

A 10% wastage factor is standard for straightforward rectangular brick walls with minimal cutting. Use 15% for walls with corners, arches, openings, or decorative bond patterns where more bricks need to be cut to size. For highly decorative or complex patterns such as herringbone or diagonal bonds, wastage can reach 20% or more.