Construction & estimating · Masonry & finishes
Plastering & rendering calculator
Render or plaster quantities: wet volume, cement bags, sand and cost.
Standard: Volume × dry factor 1.27 · cement:sand by volume
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Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Wall area | 120 | m² |
| Openings | 12 | m² |
| Thickness | 15 | mm |
| Mix 1 : x (cement : sand) | 4 | |
| Waste | 10 | % |
| Cement bag (20 kg) | 11 | $ |
| Sand | 75 | $/m³ |
| Labour | 38 | $/m² |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| Net area | 108.0 | m² |
| Wet volume (with waste) | 1.782 | m³ |
| Cement | 652 kg (33 bags) | |
| Sand | 1.81 | m³ |
| Total | $4,603 |
Method, formulas and assumptions
- Dry volume = 1.27 × wet volume
- Rates are example inputs only. Replace them with current supplier quotes and local labour rates.
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.