Calculate the exact quantities of cement, sand, and water needed for wall and ceiling plastering. Get bag counts, material weights, and cost estimates for any mix ratio.
Optional: Deduct Openings
Thickness is within recommended range (10-15mm). Typical: 12mm
Mix Ratio Information
Standard internal wall plastering
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Planning to plaster walls or ceilings? Our plaster calculator tells you exactly how much cement, sand, and water you need. Get accurate material quantities for any mix ratio, compare different plaster types, and estimate costs before starting your project.
A plaster calculator determines the quantities of cement, sand, and water needed to plaster a given wall area at a specified thickness. It accounts for the dry volume factor (35% increase for shrinkage), mix ratios, and different plaster applications. The calculator helps you avoid over-ordering materials while ensuring you have enough for the job.
Plaster Volume Formula
Dry Volume = Wall Area × Thickness × 1.35Calculate for 1:3, 1:4, 1:5, or 1:6 cement-sand ratios with guidance on which ratio suits your application.
Get recommendations for internal walls, external renders, and ceiling plastering with appropriate thickness ranges.
See cement requirements in 50kg, 40kg, and 25kg bag quantities—order exactly what you need.
Automatically subtract door and window areas to avoid over-ordering materials for your project.
Get approximate material costs to help budget your plastering project accurately.
Use pre-configured settings for bedrooms, bathrooms, kitchens, and exterior walls for quick estimates.
Calculate materials for plastering newly built walls in residential or commercial construction projects.
Estimate plaster needs when renovating bedrooms, living rooms, or other interior spaces in existing buildings.
Plan stronger plaster mixes for moisture-prone areas requiring water-resistant finishes.
Calculate weather-resistant render materials for external walls and facades.
Determine lighter plaster quantities for ceiling applications with appropriate thickness.
Estimate materials for repairing damaged plaster sections or patching holes in existing walls.
Generate accurate material estimates for construction bids and project proposals.
Help homeowners calculate exact material needs for do-it-yourself plastering projects.
For interior walls, a 1:5 or 1:6 cement-sand ratio is typically used. These ratios provide adequate strength while being economical. Use 1:5 for general interior work and 1:6 for finish coats. For bathrooms and kitchens where moisture resistance is important, consider 1:4.