Paint Calculator

Introduction to the Paint Calculator

The Paint Calculator estimates the exact litres of paint required for a room using the formula: Paint Required (litres) = (Wall Area x Number of Coats) / Coverage per Litre. A standard emulsion covers roughly 130-150 sq ft per litre on a primed wall, so a 12 x 12 ft room with 10 ft ceiling needs about 4-5 litres for two coats.

Indian homeowners and contractors use this paint quantity calculator before every painting project to avoid two costly mistakes: over-buying (Rs 600-900 per extra litre wasted on Asian Paints Royale) or under-buying (forcing colour mismatches when fresh stock has a slightly different shade). Whether you are painting a 1 BHK in Mumbai, a duplex in Bengaluru, or repainting before a wedding, accurate estimation saves money and weekend trips to the hardware store.

The calculator accepts room length, width, ceiling height, number of doors and windows, number of coats (2 recommended), and paint brand or coverage rate. Outputs include net wall area in sq ft, total paint litres needed, recommended pack sizes (1L, 4L, 10L, 20L), and an itemized cost estimate in Rs based on current Asian Paints, Berger, Nerolac, or Dulux pricing.

Who Should Use This Paint Calculator

Priya, a 32-year-old IT professional from Bengaluru, uses it to estimate paint cost before her annual Diwali repainting of her 2BHK flat in Whitefield.

Rahul, a 38-year-old building contractor from Pune, calculates paint requirements for 8-12 client projects monthly to give accurate quotes within 2% margin.

Anjali, a 45-year-old interior designer from Mumbai, uses the tool to budget paint material for her Bandra residential clients before raising purchase orders.

Vikram, a 50-year-old retiree from Jaipur DIY-painting his bungalow, computes how many 4L Asian Paints Apcolite packs to buy from the local Asian Paints dealer.

Neha, a 28-year-old homemaker from Lucknow renting a 1BHK, uses it to estimate move-in paint cost before negotiating with the landlord on reimbursement.

Tips for Paint Estimation

Smart Paint Estimation Tips

1. Always order 10-15% extra paint as buffer; this covers touch-ups, drips, uneven absorption on new plaster, and ensures consistent shade if you mix tinted colours later.

2. Two coats are mandatory for dark-to-light colour changes; one coat shows blotchy underlayer and costs more in labour fixes than the saved litre, especially with shades like Royale Aspira or Berger Silk.

3. Subtract door and window openings from gross wall area; a standard 3 x 7 ft door is 21 sq ft and a 4 x 4 ft window is 16 sq ft, easily 60-80 sq ft saved across a typical room.

4. For new construction or freshly plastered walls, add a primer coat at Rs 300-450 per litre (Asian Paints Decoprime) which seals porosity and improves topcoat coverage by 20-25%.

5. Compare price per square foot covered, not price per litre; Asian Paints Royale Luxury at Rs 720/L covers 160 sq ft so cost is Rs 4.50/sq ft, while a budget enamel at Rs 350/L covers only 90 sq ft costing Rs 3.90/sq ft.

Formula Explanation

Core Paint Quantity Formula

Paint (L) = (Wall Area x Coats) / Coverage per Litre

Where:

• Wall Area = 2 x (L + W) x H minus area of doors and windows (sq ft)
• • Coats = 2 for fresh paint, 1 for touch-up
• • Coverage = 130-150 sq ft/L for emulsion, 90-120 sq ft/L for distemper, 100-130 sq ft/L for enamel
• • Cost = Litres x Brand Price per Litre in Rs

Example: Rohan paints a 12 x 14 ft bedroom with 10 ft ceiling, one door, one window. Wall area = 2 x (12 + 14) x 10 = 520 sq ft, minus 21 + 16 = 483 sq ft net. With 2 coats and 140 sq ft/L coverage: Paint = (483 x 2) / 140 = 6.9 L, round up to 8 L (two 4L packs). Cost with Asian Paints Royale at Rs 680/L = Rs 5,440 plus Rs 600 for primer = Rs 6,040.

Paint Quick Reference Table

Room Size	Wall Area (sq ft)	Paint Needed (2 coats)	Asian Paints Cost	Berger Cost
10x10 Bedroom	380	5.5 L	Rs 3,740	Rs 3,300
12x14 Master	483	7 L	Rs 4,760	Rs 4,200
15x18 Living	627	9 L	Rs 6,120	Rs 5,400
8x10 Kitchen	320	4.5 L	Rs 3,060	Rs 2,700
6x8 Bathroom	244	3.5 L	Rs 2,380	Rs 2,100
1BHK (550 sq ft)	1,800	26 L	Rs 17,680	Rs 15,600

Real-World Example

Example: Manish's Diwali Repaint from Indore

Meet Manish, a 36-year-old chartered accountant from Indore who wants to repaint his entire 2BHK (850 sq ft carpet area) before Diwali. He has chosen Asian Paints Royale Luxury Emulsion in Pearl White for walls and Tractor Emulsion for ceilings.

Step 1: He calculates wall area for all rooms - living (15x18 ft, 10 ft height), master bedroom (12x14 ft), second bedroom (10x12 ft), kitchen (8x10 ft), and two bathrooms. Total wall area after deducting 6 doors and 7 windows = 1,920 sq ft.

Step 2: He plans 2 coats walls + 1 coat ceiling. Wall paint = (1,920 x 2) / 140 = 27.4 L of Royale. Ceiling area = 850 sq ft, ceiling paint = 850 / 130 = 6.5 L of Tractor Emulsion. Plus primer = 5 L Decoprime.

Step 3: Cost calculation - 28 L Royale at Rs 680/L = Rs 19,040; 7 L Tractor at Rs 320/L = Rs 2,240; 5 L primer at Rs 360/L = Rs 1,800. Material total = Rs 23,080. Labour at Rs 18/sq ft x 1,920 = Rs 34,560. Grand total = Rs 57,640.

Result: Manish budgets Rs 60,000 with 4% buffer for unexpected touch-ups and finishes the Diwali repaint within his planned Rs 65,000 ceiling. He locks the rate with a local Asian Paints contractor 3 weeks ahead.

Frequently Asked Questions About Paint Calculation

Indian homeowners often ask whether to count ceiling area separately, how brand coverage differs between Asian Paints Royale and Berger Silk, when to use primer vs putty, how many coats are needed for dark colours, and whether to include wastage buffer. The FAQ section below addresses these queries about wall area measurement, paint brand coverage ratings, cost per square foot comparison, and DIY vs contractor budgeting for typical Indian apartments and houses.