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How to Estimate Brick Quantity for Any Project
The universal clay brick estimation formula, with worked examples.
5 min read
·The universal formula
Clay brick quantity = (wall area in m²) × (bricks per m² for your wall thickness) × (1 + wastage %)
- •115mm single-leaf wall: ~60 bricks per m²
- •230mm double-leaf wall: ~120 bricks per m²
- •340mm thick wall (piers / columns): ~180 bricks per m²
- •Wastage allowance: 5% for simple layouts, 7–8% for patterns / decorative work
Example 1: Simple room
A 4m × 3m room with 3m-high 230mm external walls, one door (0.9m × 2.1m), two windows (1.2m × 1.2m each):
- •Wall perimeter: 14m
- •Wall area: 14m × 3m = 42 m²
- •Subtract openings: 0.9×2.1 + 2×(1.2×1.2) = 1.89 + 2.88 = 4.77 m²
- •Net wall area: 42 − 4.77 = 37.23 m²
- •Bricks: 37.23 × 120 = 4,468 bricks
- •Add 5% wastage: 4,468 × 1.05 = 4,691 bricks → round to 4,700
Example 2: Boundary wall
60m × 1.8m-high single-leaf 115mm wall:
- •60 × 1.8 = 108 m²
- •108 × 60 = 6,480 bricks
- •Piers (one every 4m, 15 piers × ~50 extra bricks each): +750 bricks
- •Cap course: +350 bricks
- •Total: 7,580 bricks, add 5% = 7,959 → round to 8,000
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