Plaster and Render Calculator
Bags of plaster or render for a wall area at a given thickness.
Results
Cement bags
56
Mass
1386.0
kg
Volume
0.900
m³
What this tool does
Coverage is quoted per square metre per millimetre of thickness on the bag, and it varies a lot between gypsum, lime and cement products — take the figure from the datasheet rather than the default. Waste allowance covers what stays in the bucket and on the floor.
Formula
volume = area × thickness ; bags = volume × consumption ÷ bag weight
Variables
| Symbol | Meaning | Unit |
|---|---|---|
a | Area | m² |
t | Thickness | mm |
cs | Consumption | kg/m²/mm |
bw | Cement bag weight | kg |
ws | Waste allowance | % |
B | Cement bags | — |
KG | Mass | kg |
V | Volume | m³ |
Worked example
- Area60 m²
- Thickness15 mm
- Consumption1.4 kg/m²/mm
- Cement bag weight25 kg
- Waste allowance10 %
- Cement bags56
- Mass1386.0 kg
- Volume0.900 m³
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- Coverage and consumption figures vary between products. Take the values from the manufacturer's datasheet for the product you are actually using.