Aircrete Block Calculator
Enter the net wall area, block length and height in millimetres, and a waste percentage to estimate the block count.
Enter your dimensions; no joint allowance or structural specification is assumed. Exact decimal fractions determine the rounded-up count.
Area already excludes openings; count = ceil(area / face area × (1 + waste / 100)). Supplied area = whole count × face area. Remaining area includes waste allowance and rounding.
Exact rational arithmetic for decimal inputs; displayed Numbers are approximations.
| Model | Exact fraction | Numeric approximation | Unit |
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Browser calculation; no inputs uploaded. No wall thickness, block grade, structural suitability or installation assessment.
A QUICK WALKTHROUGH
How to use this tool
- Enter the net wall area in m².
- Enter block length and height in mm.
- Add a waste percentage and review the rounded-up count.
Formula and scope
Estimated count = ceil(net wall area m² ÷ ((block length mm/1000) × (block height mm/1000)) × (1 + waste%/100)). Use net wall area after subtracting openings.
Structural choices are not assessed
This estimate does not assess wall thickness, block grade, structural suitability, or installation details. Confirm dimensions and specifications for the chosen product and project.
Local processing
Inputs are calculated in your browser and are not uploaded. This is an informational quantity estimate, not structural or professional advice.
Exact quantity report
Decimal inputs use exact rational arithmetic to round upward. The report includes face area, base and waste quantities, required fractional quantity, whole count, supplied area and remaining area. Numeric values are approximations; no mortar-joint dimension is assumed.
GOOD TO KNOW
Common questions
Should I enter gross or net wall area?
Enter net wall area after subtracting doors, windows, and other openings.
Does this select the right block grade or thickness?
No. It estimates count from dimensions only and does not assess structural choices.
Are my inputs uploaded?
No. The calculation runs locally in your browser.