Architectural Paint Surface Area & Deduction Formula
Gross wall surface area for a room is calculated as:
$\text{Wall Area} = 2 \times (\text{Length} + \text{Width}) \times \text{Height}$
If the ceiling is included, add $\text{Ceiling Area} = \text{Length} \times \text{Width}$. Standard Indian deductions applied:
- **Standard Door (3 ft × 7 ft)**: $21\text{ sq ft}$ ($1.95\text{ m}^2$)
- **Standard Window (4 ft × 4 ft)**: $16\text{ sq ft}$ ($1.48\text{ m}^2$)
- **Net Paint Area** = $\text{Gross Area} - \sum \text{Deductions}$.
Top Indian Paint Brands Benchmark (2026 Rates)
- **Asian Paints**: Royale Luxury (₹630/L), Apcolite Premium (₹375/L), Tractor Emulsion (₹195/L), Apex Ultima (₹480/L)
- **Berger Paints**: Silk Glamor (₹610/L), Easy Clean (₹365/L), Bison Emulsion (₹188/L), WeatherCoat (₹470/L)
- **Kansai Nerolac**: Impressions HD (₹595/L), Beauty Gold (₹355/L), Beauty Smooth (₹180/L), Excel Mica (₹460/L)
- **Dulux (AkzoNobel)**: Velvet Touch (₹620/L), SuperClean 3-in-1 (₹360/L), Promise (₹182/L), Weathershield (₹490/L)
- **Indigo Paints**: Dirtproof & Waterproof (₹545/L), Bright Ceiling Coat (₹270/L), Acrylic Emulsion (₹190/L)
- **Birla Opus**: Prime Luxury (₹580/L), One Interior (₹345/L), Style Emulsion (₹175/L)
Can Packaging Split & Procurement Optimization
Paints in India are packaged in 20L drums, 10L buckets, 4L cans, and 1L tins. Buying 20L master containers delivers a 14% to 18% savings compared to purchasing individual 1L or 4L tins. Our calculator automatically solves the most cost-effective packaging combination with a configurable 10% spill and touch-up margin.