🧱 Plaster Material Calculator
Estimate cement and sand quantity for wall plastering instantly. Get accurate material estimates for 1:4, 1:6 ratios and various thicknesses.
📏 Wall Dimensions
Wall height in feet
Wall length in feet
Thicker plaster needs more material
Higher sand ratio = lower cost
Dry Volume Factor: Wet volume × 1.33 (33% extra for bulkage & wastage)
Cement Density: 1440 kg/m³ | 1 bag = 50 kg
Cement Bags
0
50kg Bags
Sand Quantity
0
Cubic Feet
Detailed Calculation
Material Weight
Cement Weight
0 kg
≈ 0 metric tons
Sand Weight
0 kg
≈ 0 metric tons
Total Material Weight
0 kg
≈ 0 metric tons
🧱 Plaster Ratio Guide
Choosing the correct ratio of Cement to Sand is vital for the strength and finish of the wall. Different ratios serve different purposes:
📊 Mix Ratio Guide
- 1:3 – Very rich mix, used for repair works or external weather-prone areas
- 1:4 – Standard mix for ceilings and external walls
- 1:5 – Commonly used for internal brick walls
- 1:6 – Economical mix for internal walls with good quality bricks
📐 Formula Explained
Volume = Area × Thickness
Dry Volume = Wet Volume × 1.33
Cement Volume = (Cement Part / Total Ratio) × Dry Volume
Sand Volume = (Sand Part / Total Ratio) × Dry Volume
Cement Bags = Cement Volume × 1440 kg/m³ ÷ 50
📏 Plaster Thickness Guide
- 6 mm: Ceiling plastering, thin finishing coat
- 12 mm: Standard internal wall plaster
- 15 mm: External wall plaster (1.5 coats)
- 20 mm: Heavy external plaster, exposed brick walls
💡 Pro Tips for Plastering
- Always add 10-15% extra material for wastage
- Proper curing for at least 7 days prevents cracks
- Use clean, sieved sand for better finish
- Mix cement and sand thoroughly before adding water
- Apply plaster in layers for thickness >15mm
❓ Frequently Asked Questions
What is the best plaster ratio for internal walls?
For internal walls, 1:5 or 1:6 cement-sand ratios are commonly used. 1:5 provides better strength, while 1:6 is more economical. For high-quality finish, 1:4 is recommended for ceilings.
How is dry volume calculated?
Dry volume is calculated by multiplying wet volume by 1.33. This accounts for 33% extra volume due to voids, bulking, and wastage during mixing and application.
How much sand is needed for 1 bag of cement?
For 1:6 ratio, 1 bag of cement (50kg) requires approximately 6 cubic feet of sand. For 1:5 ratio, about 5 cubic feet; for 1:4 ratio, about 4 cubic feet of sand.
What is the coverage of 1 bag of cement?
For 12mm thick plaster with 1:6 ratio, 1 bag of cement covers approximately 10-12 sq ft. For 15mm thickness, coverage reduces to about 8-10 sq ft per bag.
⚠️ Disclaimer: This calculator provides estimates for construction planning. Actual requirements may vary based on surface texture, workmanship, and material quality. Always add 10-15% extra for wastage.