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Plastering Calculator
Wall Dimensions
ft
ft
Plaster Settings
12mm - Internal walls | 15mm - External walls | 20mm - External rough walls
1:4 - High strength | 1:5 - Standard | 1:6 - Economy grade
1 Coat - Standard finish | 2 Coats - Premium smooth finish
Area Calculations
Wall Area (Sq Ft)
100 sq ft
Wall Area (Sq M)
9.29 sq m
Plaster Volume
0.111 m³
Dry Volume
0.148 m³
Material Requirements
Cement Bags
1 bags
(50kg each)
Cement Weight
35.59 kg
Sand Required
4.36 cft
(197.7 kg)
Water Required
7.12 L
Cost Estimate
Total Estimated Cost
₹6,619
Cement
₹400
Sand
₹218
Labor
₹6,000
Cost Breakdown
How We Calculate Plastering Requirements
Step 1: Area Calculation
We calculate the wall area by multiplying Length × Height, then convert to square meters for volume calculations.
Wall Area = 10 × 10 = 100 sq ft = 9.29 sq m
Step 2: Plaster Volume
Plaster volume = Wall area × Thickness × Number of coats. Using 12mm thickness for 1 coat.
Volume = 9.29 × 0.012 × 1 = 0.111 m³
Step 3: Dry Volume Adjustment
We add 33% to the wet volume to get the dry volume of materials needed. This accounts for voids and compaction.
Dry Volume = 0.111 × 1.33 = 0.148 m³
Step 4: Material Distribution
Based on the cement:sand ratio (1:5), we distribute the dry volume proportionally:
- Cement: 1 bags (35.59 kg) @ ₹400/bag
- Sand: 4.36 cubic feet (197.7 kg) @ ₹50/cft
- Water: 7.12 liters (20% of cement weight)
- Labor: 100 sq ft @ ₹60/sq ft
Key Assumptions
- • Cement density: 1440 kg/m³
- • Sand density: 1600 kg/m³
- • Water-cement ratio: 0.2 (20% by weight)
- • Dry volume factor: 1.33 (33% increase)
- • Labor cost: ₹60 per sq ft
- • Material costs: Cement ₹400/bag, Sand ₹50/cft
Pro Tips
Thickness Selection:
- • 12mm - Internal walls, smooth surfaces
- • 15mm - External walls, moderate exposure
- • 20mm - External rough walls, heavy exposure
- • Check local building codes
Best Practices:
- • Wet the wall before plastering
- • Use clean, fine sand
- • Apply in thin, even coats
- • Cure properly for 7-14 days
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