Plaster Calculator
Estimate cement and sand required for wall plastering works.
Enter wall dimensions to get estimate.
About Plaster Calculator
The Plaster Calculator is an essential tool for site engineers, contractors, and homeowners to estimate the exact quantity of cement and sand required for wall plastering. It accounts for different plaster thicknesses (12mm, 15mm, 20mm) and mix ratios, automatically adding safety margins for material wastage and sand bulkage.
How to Use This Tool
Measure Wall Area - Free Construction Calculator | NexUtils
Free measure wall area for construction professionals. Calculate materials, costs, and quantities accurately. Easy to use and completely free.
Select Thickness
Choose 12mm for internal walls, 15mm for rough surfaces, or 20mm for external walls.
Choose Mix Ratio
Select the cement-to-sand ratio. 1:4 is standard for internal walls, while 1:6 is common for external plastering.
Frequently Asked Questions
Which plaster ratio should I use?
For internal walls, a 1:4 ratio (1 part cement, 4 parts sand) is standard. For external walls, a leaner 1:5 or 1:6 ratio is typically used. For ceilings, a richer 1:3 ratio is recommended.
Does this include wastage?
Yes, the calculator automatically adds approximately 30-35% extra volume to account for dry volume conversion, sand bulkage (swelling due to moisture), and onsite wastage.
Key Features
- •Cement Bags Calculation (50kg bags)
- •Sand Quantity in Cubic Feet, Tons & Cubic Meters
- •Supports Standard Thickness (12/15/20mm)
- •Auto-buffer for Wastage & Bulkage (~35%)
- •Dual Unit Output (sq.mt & sq.ft)