Brick Calculator for Walls
Enter your wall dimensions and get the number of standard Indian bricks required, plus the cement and sand for mortar — with a wastage allowance already included.
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Mortar for this wall (1:6 mix)
Assumptions used: standard modular brick 190 × 90 × 90 mm with a 10 mm mortar joint on each face, giving a nominal 200 × 100 × 100 mm block (500 bricks per cubic metre). 5% wastage added for breakage and cutting. Mortar mixed 1 part cement to 6 parts sand, with a 1.33 dry volume factor. All of these are editable constants in our code.
How the brick count is worked out
- Net wall area — length × height, minus the area of any doors and windows you enter.
- Wall volume — net area converted to square metres, multiplied by the wall thickness in metres.
- Nominal brick size — each brick occupies its own size plus a 10 mm mortar joint, so a 190 × 90 × 90 mm brick occupies a 200 × 100 × 100 mm block, i.e. 0.002 m³.
- Count — wall volume ÷ 0.002 gives 500 bricks per cubic metre. A 5% wastage allowance is added and the answer rounded up.
Standard Indian brick sizes
| Type | Actual size | With 10 mm mortar |
|---|---|---|
| Modular brick (IS standard) | 190 × 90 × 90 mm | 200 × 100 × 100 mm |
| Traditional / non-modular | 230 × 110 × 70 mm | 240 × 120 × 80 mm |
| Common field brick | Varies by kiln | Measure a sample of ten |
This calculator uses the IS modular brick. If your supplier's bricks differ, the count will shift — measure ten bricks, take the average, and adjust the constant in our code or scale the result proportionally.
Wall thickness explained
- 4.5 inch (half brick, 114 mm) — internal partitions and non-load-bearing walls. Bricks are laid on edge in a single leaf.
- 9 inch (full brick, 229 mm) — the standard load-bearing external wall in Indian construction.
- 13.5 inch (one and a half brick, 343 mm) — heavy load-bearing walls, retaining walls and lower storeys of taller masonry buildings.
Practical tips
- Soak bricks before laying. Dry bricks pull water out of the mortar and weaken the bond. Six to eight hours of soaking is typical.
- Keep joints to 10 mm. Thicker joints waste mortar and reduce wall strength.
- Order 5–10% extra. Breakage in transit, cutting at corners and rejects at the kiln all eat into your delivered count.
- Cure the masonry. Sprinkle water on newly built walls for at least seven days.
Brick Calculator — common questions
Short, practical answers to the questions people ask most about this tool.
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