Estimate exactly how much paint you need for a room, wall or full house. Enter wall dimensions, deduct doors and windows, choose the number of coats and we will calculate litres, recommended pack sizes and total cost - including a buffer for two coats and primer.
Perimeter × ceiling height. Subtract doors and windows.
Paint needed
7 L
Covers 880 sq.ft total
Estimated cost
₹2,369
Net wall area
440 sq.ft
Recommended pack combination
Pack sizes available: 1 L, 4 L, 10 L and 20 L. We pick the combination closest to your requirement.
Coverage varies with surface texture, primer quality and application method. Rough or unprimed walls absorb 20-30% more paint. Always confirm coverage from the product datasheet before buying.
Часть содержимого пока показывается на английском.
House painting is one of those projects where Indian homeowners consistently over-spend or under-buy. Over-spending happens when painters or hardware shop owners quote vague 'estimates' that include 20-30% safety margin you don't need; under-buying happens when you trust the can label and end up rushing to the shop midway through a coat (and the new can's batch might not exactly match the colour). This calculator helps you arrive at the right quantity using the exact wall area, paint coverage rate per litre, number of coats, and door/window deductions - so you buy enough but not too much.
For a typical 2BHK Indian flat (1000-1200 sq ft carpet, ~3500-4000 sq ft wall area for interiors), full repainting requires roughly 25-35 litres of premium emulsion plus 6-8 litres of primer. At ₹400-₹800 per litre depending on brand and finish, that's ₹15,000-₹30,000 in paint alone (labour and supplies add another ₹10,000-₹20,000). Getting the quantity right matters. The calculator also recommends optimal pack sizes - 4L + 20L tins instead of many 1L cans - which is significantly cheaper per litre and matches actual brand SKUs (Asian Paints, Berger, Nerolac, Dulux all sell 1L, 4L, 10L and 20L variants).
Enter the total wall area in sq.ft. For a single rectangular room use perimeter × height.
Subtract the area of doors and windows you do not plan to paint.
Pick a paint type (premium emulsion, distemper, exterior, primer) - coverage is pre-filled.
Set the number of coats (2 is standard for opacity).
Enter the price per litre. The result shows litres needed, recommended pack combination and total spend.
Paint coverage is the area one litre can cover at a single coat on a smooth, primed surface. Premium emulsions typically cover 110-160 sq.ft per litre per coat, while distemper and exterior paints cover less because of texture and weatherproofing solids. The calculator multiplies wall area by the number of coats, divides by coverage to get litres, and then groups the litres into available pack sizes (1 L, 4 L, 10 L, 20 L) using a greedy match - biggest pack first - so you do not over-purchase.
Litres = (Net wall area × Coats) / Coverage per litre
Step 1: measure total wall area. For a single rectangular room: perimeter × height. For a 12×10 ft room with 10 ft ceiling, perimeter is (12+10) × 2 = 44 ft, wall area is 44 × 10 = 440 sq ft. Step 2: subtract openings. Standard door = 3×7 = 21 sq ft; standard window = 4×4 = 16 sq ft. A typical bedroom has 1 door + 1 window = ~37 sq ft to deduct. Step 3: choose paint type and look up coverage rate. Step 4: multiply by number of coats and divide by coverage rate to get litres needed.
Coverage rates vary by paint type: Premium emulsion (Royale Shyne, Apex Premium, Pearl Glo) covers 130-160 sq ft per litre per coat on smooth primed walls. Standard emulsion (Apcolite, Easy Clean) covers 110-130. Distemper covers 90-110 sq ft. Exterior emulsion (Apex Ultima, Weather Coat) covers 100-130 due to higher solids content. Primer (Acrylic Wall Primer, Tractor Primer) covers 100-140 per litre per coat. These are 'first coat' figures on smooth primed walls; textured or fresh plaster surfaces consume 20-30% more.
Recommended pack-size assembly: rather than 17 individual 1L tins, the calculator finds the best combination of 20L + 10L + 4L + 1L packs to minimise cost and waste. Bulk packs are significantly cheaper per litre - a 20L tin is typically 15-20% cheaper per litre than four 4L tins. Always include a 10-15% safety buffer for retouching, drips and the dreaded 'colour didn't match between batches' problem.
Premium emulsion @ 140 sq ft/L coverage, 2 coats: (850 × 2) / 140 = 12.1 L. Add 10% buffer: 13.3 L. Pack mix: one 10L + one 4L = 14L. Cost @ ₹500/L: ~₹7,000 for finish paint. Add primer (1 coat @ 130 sq ft/L = 6.5L ≈ 1 × 4L + 3 × 1L): ~₹2,000. Total: ~₹9,000 in paint.
Exterior emulsion @ 110 sq ft/L coverage, 2 coats: (1500 × 2) / 110 = 27.3 L. Buffer 15% (more wastage outdoors): 31.4 L. Pack mix: 1 × 20L + 1 × 10L + 1 × 1L = 31L. Cost @ ₹600/L for weather-proof: ~₹18,600. Add primer 1 × 4L: ~₹1,400. Total: ~₹20,000.
Premium emulsion, 2 coats, 140 sq ft/L: (320 × 2) / 140 = 4.6 L. Buffer: 5.1 L. Pack mix: 1 × 4L + 1 × 1L = 5L. Cost: ~₹2,500. Quick weekend DIY project.
Add the lengths of all four walls (the perimeter), multiply by the ceiling height. Example: a 12×10 ft room with 10 ft ceiling has perimeter 44 ft, so wall area is 440 sq.ft.
Yes. A standard door takes ~21 sq.ft (3×7 ft) and a window ~15 sq.ft. Deducting prevents over-buying paint.
One coat rarely gives full opacity on bare or primed walls. Two coats deliver consistent colour, longer life and reduce show-through.
Primer goes on first as a base layer and improves topcoat coverage. Plan for 1 coat of primer plus 2 coats of finish paint. Primer is calculated separately.
Yes. Textured or rough walls absorb 20-30% more paint. Multiply litres by 1.2-1.3 in those rooms.
Asian Paints, Berger and Nerolac all sell 1 L, 4 L, 10 L and 20 L tins for most product lines. Some premium ranges only come in 4 L and 20 L. The calculator uses the standard four.
Renovating, decorating or estimating utilities at home almost always reduces to three numbers - area, volume, and cost. Get any of them wrong by 10% and you're either short of paint and tile, or you've over-ordered and have to return material. This calculator uses the same wastage allowances, packing rules and unit conversions that contractors and material suppliers actually use in India.
Use it together with the paint, tile, electricity bill and BTU calculators to plan a complete renovation budget. Indian states have very different electricity tariffs and material prices, so the calculators expose state-wise tariffs (Maharashtra MSEDCL, Tamil Nadu TANGEDCO, Delhi BSES, Karnataka BESCOM, etc.) and let you override defaults to match your supplier's pricing.
The Paint Calculator is part of the Home & Lifestyle suite on Online Calculator Tools, alongside 6 related calculators. All tools share the same UI patterns, the same privacy-first rendering (nothing is sent to a server), and the same commitment to showing the formula and assumptions behind every result.
