Plaster calculator
Enter the area, thickness and mortar ratio to get the cement bags and sand for plastering — plus the material cost by state.
How it works
Plaster volume = area × thickness, taken to a dry volume, then split by the cement:sand ratio.
- Internal walls are usually 12 mm; external 15–20 mm.
- 1:6 is typical; 1:4 for stronger, external work.
Plaster Calculator FAQ
How much cement for 1000 sq ft plaster?›
Roughly 8–9 bags at 12 mm with a 1:6 ratio, plus about 230 cft of sand.
What thickness should I use?›
12 mm for internal walls, 15–20 mm for external faces.