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AAC Block Quantity Calculator

Work out aac block quantity instantly with clear inputs, formula shown and shareable results.

About AAC Block Quantity Calculator

Autoclaved aerated concrete blocks are laid in thin-bed adhesive rather than mortar, so the joint adds almost nothing to the coursing and blocks per square metre is simply one divided by the face area of a block. A five percent allowance covers cutting at openings, and adhesive runs about 3.5 kg per square metre of wall.

Formulas

Blocks per m²

Blocks/m² = 1 / (block length m x block height m)

Quantity

Blocks = wall area x blocks per m² x 1.05

Worked example

With the default values below, AAC Block Quantity Calculator returns Blocks required of 263. Change any input above and every figure here is recalculated in your browser.

Inputs used

Wall lengthminimum 0.1 m
10 m
Wall heightminimum 0.1 m
3 m
Block lengthminimum 50 mm
600 mm
Block heightminimum 50 mm
200 mm

Results

Blocks required
263
Wall area
30.00 m²
Blocks per square metre
8.33
Thin-bed adhesive required
105.0 kg

Step by step

  1. 1Values used
  2. 2Blocks per m²
  3. 3Quantity
  4. 4Blocks required= 263
  5. 5Wall area= 30.00 m²
  6. 6Blocks per square metre= 8.33
  7. 7Thin-bed adhesive required= 105.0 kg

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the AAC Block Quantity figure worked out?

Blocks/m² = 1 / (block length m x block height m). Autoclaved aerated concrete blocks are laid in thin-bed adhesive rather than mortar, so the joint adds almost nothing to the coursing and blocks per square metre is simply one divided by the face area of a block.

Why so much less adhesive than mortar?

A thin-bed joint is 2-3 mm rather than 10 mm, and AAC blocks are dimensionally accurate enough to allow it. That is a large part of the material saving the system claims.

What values do I need to enter?

This calculator takes 4 inputs: Wall length, Wall height, Block length, Block height. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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