How the quantities are calculated
Follow the method, check the example and review the assumptions.
How the quantities are calculated
Follow the method, check the example and review the assumptions.
From measurements to materials
Wet volume = area × thickness. Dry volume = wet volume × dry factor, divided by the entered cement:sand parts.
Put the numbers in context
Ten square metres at 12 mm is 0.12 m³ wet plaster. With a 1.33 factor, dry ingredients total 0.1596 m³ before wastage.
This illustrates the method; your inputs determine your result.Assumptions to check
- Flat area is net of openings and unplastered sections.
- Measured jamb, head and applicable sill faces are added separately.
- Thickness is an average across the measured surface.
Limits of this calculation
- Uneven backgrounds and levelling can materially increase thickness and usage.
Common questions
Can I use a different plaster ratio?
Yes. Ratio and dry-volume factor are editable under assumptions so they can match the project specification.
Does this include wall putty?
No. Putty is a separate finish calculated from product coverage and surface area.