How many aerated concrete blocks for a house

Calculate external and internal walls separately because they use different thicknesses. For a two-storey house, add each floor; for an exact figure, subtract reinforced-concrete ring beams, columns and lintels from the masonry area.

1. Masonry area = total length of walls × wall height − openings (doors, windows).
2. Number of blocks = area ÷ 0.15 m² (face of a 600 × 250 mm block) + 5–10% waste.
3. Volume = area × wall thickness (0.25–0.30 m external, 0.10–0.15 m internal partitions).
4. Pallets = volume ÷ the pallet volume printed on the manufacturer's label (typically 1.5–1.9 m³).

Single-storey, 9 × 9 m external footprint, 2.7 m walls, 30 cm external blocks:

• perimeter 36 m; gross wall area 36 × 2.7 = 97.2 m²;
• openings (front door, 6–7 windows) about 15 m² → about 82 m² of masonry;
• blocks: 82 ÷ 0.15 = 547, with 5% waste about 575;
• volume: 82 × 0.30 = 24.6 m³ → about 14 pallets of 1.8 m³.

A 10 × 10 m bungalow has a 40 m perimeter and 108 m² of gross wall; with about 18 m² of openings that leaves about 90 m², roughly 630 blocks of 30 cm, 27 m³, 15–16 pallets. The more elongated the plan, the longer the perimeter for the same floor area.

A 4 × 4 m room with 2.6 m walls has 41.6 m² gross; with a door and a window (about 3.5 m²) about 38 m² remain — around 255 blocks including waste, or 9.5 m³ at 25 cm thickness.

Usable floor area is measured inside and says nothing about wall length. Two 100 m² houses can differ by 20–30% in masonry: one compact and square, the other L-shaped with many corners. Thin-bed mortar adds roughly 20 kg per m³ of masonry; the first course is laid on normal mortar to level it.