Enter Wall and Rate Details
Example Data Table
| Wall (L×H) | Openings | Block (L×H×T) | Waste | Unit Price | Blocks (rounded) | Total Cost |
|---|---|---|---|---|---|---|
| 10 m × 3 m | 1.2 m² | 600×200×150 mm | 5% | PKR 260 | 243 | PKR 86,000–110,000* |
| 8 m × 3.2 m | 0.8 m² | 600×200×100 mm | 7% | PKR 240 | 232 | PKR 75,000–98,000* |
| 12 m × 2.7 m | 2.0 m² | 600×250×200 mm | 6% | PKR 310 | 216 | PKR 92,000–125,000* |
Formula Used
- Gross wall area (m²) = Wall length × Wall height
- Net wall area (m²) = Gross wall area − Openings area
- Module face area (m²/block) = ((Block length + Joint) ÷ 1000) × ((Block height + Joint) ÷ 1000)
- Blocks (exact) = Net wall area ÷ Module face area
- Blocks (rounded) = CEIL(Blocks exact × (1 + Wastage% ÷ 100))
- Mortar quantity (kg) = Net wall area × Mortar use (kg/m²)
- Wall volume (m³) = Net wall area × (Thickness ÷ 1000)
- Grand total = Subtotal + (Subtotal × Tax% ÷ 100)
How to Use This Calculator
- Measure wall length and height, then enter openings area.
- Select your AAC block size and typical joint thickness.
- Set wastage based on cuts and handling conditions.
- Enter your block price, mortar usage, and mortar price.
- Choose labor mode and provide the matching labor rate.
- Add transport, miscellaneous, and tax if applicable.
- Press Calculate to view results and export files.
AAC Block Quantity Planning for Wall Geometry
Start with accurate wall length and height, then deduct openings. This calculator converts dimensions into gross and net wall area, helping you align purchase orders with drawings. Enter combined door and window area, not individual sizes, to reduce input errors. When site changes occur, re-run the net area to keep quantities current and avoid leftover pallets. For multi-storey work, calculate each floor separately and sum totals, because access limits and batching may change wastage and labor productivity material.
Block Module Size and Joint Allowance
AAC blocks are laid with a thin joint. The calculator uses a “module” face area that adds joint thickness to block length and height, then divides net area by that module. This approach reduces optimistic counts that ignore joints. If your supplier provides different tolerances, adjust the joint value to match your adhesive system and workmanship.
Wastage, Breakage, and Cutting Strategy
Wastage is not only breakage; it includes corner cuts, service chases, and rework. For straight walls with few returns, 3–5% often covers handling and trimming. For partition layouts with frequent offsets, consider 7–10%. Use the wastage field to model best and worst cases, then confirm with your site storage and lifting method.
Mortar Consumption and Labor Pricing
Mortar input is expressed as kilograms per square meter, which suits thin-bed adhesives and keeps the estimate consistent across thicknesses. If you track mortar by bag, convert bag mass to kilograms and set a realistic kg/m² based on trials. Labor can be priced per square meter or per block. Choose the mode that matches your subcontract agreement.
Interpreting Unit Costs and Budget Controls
Total cost combines blocks, mortar, labor, transport, miscellaneous items, and optional tax. Review the cost per m² to compare alternatives, such as different block sizes or labor rates. Cost per block is useful for reconciliation against invoices. Keep transport and misc separate so you can update only the items that change with distance, unloading, or site constraints.
FAQs
1) How does joint thickness change the quantity?
Joint thickness increases the effective module size. A larger joint raises module area, reducing the calculated block count slightly. Use the joint value that matches your adhesive type and on-site workmanship.
2) Should openings include lintels or beams?
Subtract only the clear opening areas for doors and windows. Do not subtract lintels, columns, or ring beams unless they replace AAC wall area. If structure interrupts the wall, measure and deduct the actual non-block area.
3) What wastage percentage should I use?
Use 3–5% for simple, straight walls with minimal cutting. Use 7–10% for partitions with many returns, chases, or frequent design changes. Always validate with previous site records when available.
4) Can I enter dimensions in feet or inches?
This tool expects meters for wall dimensions and millimeters for block sizes. Convert your measurements before entry to keep results consistent. Using mixed units will produce incorrect quantities and costs.
5) Why are there two block counts?
The exact count is a theoretical quantity based on net area and module size. The rounded count applies wastage and then rounds up to whole blocks, which matches how materials are purchased.
6) How do I set mortar consumption per m²?
Start with your adhesive manufacturer guidance, then confirm with a site trial over a measured wall area. Record kilograms used per square meter, including minor waste, and update the input for better estimates.