Cement and sand for plaster – 12 mm and 20 mm
Quantities for cement plaster per 100 sq ft, using dry volume = wet volume × 1.33 (bulking and wastage).
wet volume = area × thickness · dry volume = wet × 1.33
cement (cum) = dry volume ÷ sum of ratio · 1 bag = 0.0347 cum
cement (cum) = dry volume ÷ sum of ratio · 1 bag = 0.0347 cum
Per 100 sq ft (9.29 sq m)
| Plaster | Cement | Sand |
|---|---|---|
| 12 mm internal, 1:6 | ≈ 0.6 bag | ≈ 4.5 cft |
| 15 mm, 1:6 | ≈ 0.75 bag | ≈ 5.6 cft |
| 20 mm external, 1:4 | ≈ 1.4 bags | ≈ 7 cft |
Example: 1000 sq ft wall, 12 mm, 1:6
≈ 6 bags of cement and ≈ 45 cft of sand. Ceiling plaster is usually 6 mm in 1:3 (about 0.5 bag per 100 sq ft).
Calculate for your own measurements with AI Onin – freeAI Onin is a free AI assistant for construction: material quantities, BOQ, cost estimates and site photo analysis. Values are approximate (India, 2026); always follow your structural drawings, IS codes and the manufacturer's data. Structural design must be checked by a licensed structural engineer.