the symbol ofStrengthFind my product →Enter your wall size and block dimensions — we'll count the AAC blocks you need (allowing for joints and openings), plus the wall volume and the jointing mortar to lay them.
Common Indian AAC sizes (Length × Height × Thickness). The face size (L × H) sets how many blocks per m².
▼Thin-bed jointing mortar is laid at 2–3 mm. It slightly enlarges each block's footprint, so more joint = fewer blocks.
Extra for breakage, cutting & corners. 5% is typical for AAC.
Block count is worked out from the block face size plus the joint thickness on each side, applied to your net wall area. The jointing-mortar figure uses SUMODRY Block Jointing Mortar at ~25–30 kg per m³ of masonry. Round up for cuts and corners; actual counts vary with bond pattern and wall layout. Always confirm on site.
This calculator counts the AAC blocks your wall needs — with door and window openings deducted and wastage applied — and, in the same pass, the SUMO Block Jointing Mortar to lay them. Most block calculators stop at the block count; the mortar half of the estimate is exactly what gets ordered wrong on site.
All common Indian AAC sizes are built in (600 × 200 mm and 600 × 240 mm faces, 75–250 mm thick), plus custom sizes.
Enter the wall length and height in feet or metres — or the total wall area directly.
Pick your AAC block size — e.g. 600 × 200 × 100 mm for partitions, thicker blocks for external walls.
Set the joint thickness (2–3 mm for thin-bed adhesive jointing).
Add door/window openings so they are deducted from the blockwork.
Read blocks required, mortar in kg, and 40 kg bags to buy.
For every 600 × 200 mm-face block size, that works out to ≈ 8.2 blocks per m² of wall at a 3 mm joint (≈ 76 blocks per 100 sq.ft, before wastage).
| Block size | Blocks / m² | BJM consumption | Wall covered per 40 kg bag |
|---|---|---|---|
| 600 × 200 × 100 mm | ≈ 8.2 | ≈ 3.7 kg/m² | ≈ 10.8 m² · 110–120 sq.ft |
| 600 × 200 × 150 mm | ≈ 8.2 | ≈ 5.6 kg/m² | ≈ 7.2 m² · 77 sq.ft |
| 600 × 200 × 200 mm | ≈ 8.2 | ≈ 7.4 kg/m² | ≈ 5.4 m² · 58 sq.ft |
| 600 × 200 × 230 mm | ≈ 8.2 | ≈ 8.6 kg/m² | ≈ 4.7 m² · 50 sq.ft |
Blocks per m² depends only on the block face, so it is the same for every thickness — mortar consumption is what scales with thickness.
One 600 × 200 mm AAC block replaces several clay bricks of wall face, which is where the whole system economy comes from:
Fewer units to lay: ≈ 8.2 blocks per m² of wall versus dozens of bricks — walls rise visibly faster with less labour.
A fraction of the jointing material: 2–3 mm adhesive joints instead of 10–12 mm sand-cement beds — roughly a quarter of the mortar mass per m².
Much lighter walls: AAC is roughly a third the density of fired clay brick, which reduces the dead load the structure carries.
Straighter walls out of the box: dimensional accuracy means thinner plaster coats on top — the savings continue into the next trade.
Confirm the block size actually being delivered — a 230 mm block instead of 200 mm changes mortar consumption by ~15%.
Measure every door and window opening and enter them; openings are typically 15–25% of a wall.
Decide the joint now: 2–3 mm thin-bed. If the supplier suggests thicker "to adjust level", fix the first course instead.
Keep 5% block wastage for cutting — more if the design has many part-block ends.
10 × 10 ft = 100 sq.ft = 9.29 m² of wall face.
Blocks: 9.29 × 8.2 ≈ 76 blocks → with 5% wastage ≈ 80 blocks.
Mortar: 9.29 × 3.7 ≈ 35 kg.
With the standard 600 × 200 mm block face and a 3 mm joint, about 76 blocks per 100 sq.ft of wall — order ~80 with 5% wastage. The count is the same for every block thickness; only the mortar quantity changes.
100–150 mm blocks are commonly used for internal partitions, and 200–230 mm for external walls — confirm against your structural drawings. Pick the size in the calculator and both blocks and mortar update.
Yes — openings are wall area you do not build. This calculator has fields for opening area (or width × height), deducts them before counting, and only then applies wastage.
For 600 × 200 × 100 mm blocks at a 3 mm joint, 100 blocks build about 12.2 m² of wall and use ≈ 45 kg of Block Jointing Mortar — just over one 40 kg bag.
They can, but a 10–12 mm site-mix bed wastes the dimensional accuracy AAC gives you: 4–5× more material, slower laying, joint curing, and thicker thermal bridges. Thin-bed Block Jointing Mortar at 2–3 mm is the system AAC is designed for.