Wall Plaster Calculator by Area and Layer Thickness
Estimate dry plaster weight and whole bags from wall size, layer thickness and product consumption.
Formula
Planning estimate. Check product specifications and local requirements before purchasing.
Worked example: Wall Plaster Calculator
Measurements in this example
| Length | 5 m |
|---|---|
| Width | 2.7 m |
| Layer thickness | 10 mm |
| Product consumption | 1 kg/m²/mm |
| Bag weight | 25 kg |
| Waste allowance | 8 % |
Calculated quantities
| Area | 13.5 m² |
|---|---|
| Dry material | 145.8 kg |
| Bags | 6 |
What to check
This calculation uses: Length, Width, Layer thickness, Product consumption, Bag weight, Waste allowance. It returns: Area, Dry material, Bags.
Check the wall in several places because an uneven substrate rarely has one exact thickness. Use a realistic average and calculate deep repairs separately.
Area is multiplied by layer thickness and the product consumption stated per square metre per millimetre. Waste is added before dividing by bag weight.
The dry weight helps compare products with different sack sizes. Water is not included because mixing ratios and final wet volume depend on the product.
A few deep hollows can use more material than a broad thin coat. Repair them first or include them as separate measured zones.
Use the units beside each field. The values in the worked example are starting inputs; replace them with your measurements and the specifications of your material.
Compare alternatives
Open a tool, enter your measured dimensions, then save an estimate. Keep another version if you want to compare products or allowances.