Plaster calculator using the IS 1661 / CPWD method: wet volume = area × thickness, +20% for joints and uneven surfaces, × 1.27 dry-volume factor, split by mix ratio. Typical: 12 mm internal 1:6, 15–20 mm external 1:4, 6 mm ceiling 1:3. Costs at editable Delhi NCR Oct 2026 rates (cement ₹425/bag, sand ₹75/cft). Indicative ±10–15%.
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