ClarityHow to use this tool
- Enter plaster area, average thickness, supplier consumption, bag mass, waste allowance.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Mass = area × thickness × supplier consumption × allowance. Round mass/bag mass up.
Using plaster area = 50 m², average thickness = 10 mm, supplier consumption = 0.9 kg/(m²·mm), bag mass = 25 kg, waste allowance = 10 %, the result is 20 bags. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Use the product’s dry consumption rate. Uneven substrates and application losses can increase the actual quantity.
What to keep in mind
Use the product’s dry consumption rate. Uneven substrates and application losses can increase the actual quantity. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.
Common questions
How do I use this plaster quantity calculator?
Estimate dry plaster bag count using supplier consumption per square metre per millimetre. Enter plaster area in m², average thickness in mm, supplier consumption in kg/(m²·mm), bag mass in kg, waste allowance in %. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Use the product’s dry consumption rate. Uneven substrates and application losses can increase the actual quantity.
Methodology maintained by ClarityKit. How these tools are built and checked.