Paint Calculator

For a typical 1,000 sq ft house (built-up area), the actual wall surface area to be painted is usually 2.5 to 3 times the floor area once you account for wall height and internal partitions — so you're generally looking at roughly 2,500-3,000 sq ft of paintable wall surface after deducting doors and windows. Using a standard emulsion paint with a coverage of around 110 sq ft per litre and 2 coats, this works out to approximately 45-55 litres of paint for the interior. If you're also painting the exterior, budget separately using exterior paint's lower coverage rate (around 100-110 sq ft per litre) against your home's external wall area, which depends heavily on the number of floors and whether it's a standalone or row house. As a rough all-in figure, most 1,000 sq ft homes need somewhere between 55-75 litres of paint total (interior plus exterior, 2 coats each), though ceilings — often painted a different colour or left white — and any accent walls will shift this number slightly.

Two coats is the standard for the large majority of walls, and it's what most professional painters default to unless there's a specific reason to do otherwise. A single coat almost always leaves the wall looking patchy or translucent, since one thin layer of paint rarely achieves full, even opacity — you can often still see the primer or previous colour showing through in places, especially under direct light. A third coat becomes necessary in a few specific situations: when you're painting a light colour over a significantly darker existing colour (or vice versa), when the wall surface has visible stains, patches, or uneven texture that need extra coverage to hide, or when you're using a lower-cost paint with lighter pigment concentration that simply needs more layers to look fully opaque. If you're painting a brand-new, bare (unpainted) wall, it's also standard practice to apply one coat of primer first, followed by 2 coats of your chosen paint — the primer isn't counted as one of your 'paint coats' since it uses a separate product with different coverage characteristics, but it should be budgeted as an additional cost line.

Painting cost in India is made up of two components — the material (paint) cost, and the labour cost — and both vary considerably depending on the paint quality tier and city. For material alone, using a mid-range emulsion paint at 2 coats, you're typically looking at roughly ₹15-25 per sq ft of paintable area. Labour charges for application usually add another ₹12-20 per sq ft depending on the city and the painter's experience, though this can be lower in smaller towns and higher in metro cities where skilled labour costs more. Combined, a reasonable working estimate for a full interior repaint with a standard-quality emulsion is roughly ₹28-45 per sq ft of paintable wall area, all-in. For a typical 1,000 sq ft house with around 2,500-3,000 sq ft of paintable wall area, this generally works out to somewhere in the range of ₹75,000 to ₹1,35,000 for a complete interior repaint, before considering exterior work, ceiling painting, or premium/luxury paint finishes, which push the per-sq-ft rate considerably higher.

These three represent different price points and use cases, and choosing the wrong one for a given surface is a common source of both wasted money and disappointing results. Distemper is the most economical option, typically water-based, and commonly used for budget interior projects, rental properties, or spaces where frequent repainting is expected — it offers the lowest durability and washability of the three, and tends to chalk or fade faster, but costs meaningfully less per litre than emulsion. Emulsion paint sits in the middle to premium range and is the most common choice for interior walls in owner-occupied homes today, offering better washability, richer colour retention, and greater durability against everyday wear — it comes in multiple finish levels (matte, satin, and glossy), with higher-finish variants generally costing more but offering better stain resistance and easier cleaning. Enamel paint is a different category altogether, formulated for hard, glossy, highly durable surfaces rather than large wall areas — it's the standard choice for doors, window frames, grills, railings, and other wood or metal surfaces that see frequent contact and need a hard-wearing, easy-to-wipe finish. Using enamel on large wall surfaces is unusual (it's expensive and creates an overly glossy look for most interiors), just as using basic distemper on high-touch surfaces like door frames would wear out quickly — matching the right paint type to the right surface matters as much as choosing a good brand.

Start by measuring the perimeter of the room (the total length of all four walls added together), then multiply that by the wall height to get your gross wall area — the formula is 2 × (Length + Width) × Height. This gives you the full wall surface including the space taken up by doors and windows, which you haven't painted over, so the next step is deducting for openings. A standard, quick approximation is to deduct roughly 10-15% of the gross wall area for a room with typical door and window sizes — one standard door and one or two windows. If your room has unusually large openings — a big sliding door, floor-to-ceiling windows, or a wall of built-in wardrobes — measure those openings individually (width × height) and subtract their exact combined area instead of relying on the standard percentage, since the generic deduction can meaningfully underestimate your paint savings in rooms with large glazed areas. Ceilings are calculated separately, using length × width of the floor area, and are often priced and painted differently from walls (frequently in white or a lighter shade), so most estimates keep ceiling area as a distinct line item rather than folding it into the wall calculation.

Coverage per litre varies by paint type and, to a lesser extent, by brand and the specific surface being painted, so there's no single universal number — but reasonable working ranges exist for planning purposes. Distemper typically covers around 120-140 sq ft per litre per coat, the highest coverage of the common paint types, which is part of why it's the most economical option per square foot despite also being the lowest-durability finish. Standard emulsion paint generally covers 100-120 sq ft per litre per coat — somewhat less than distemper because emulsion is thicker and formulated for a smoother, more opaque, longer-lasting finish. Exterior weatherproof paints usually cover a similar or slightly lower range, around 100-110 sq ft per litre, since they're formulated with additional weather-resistant additives that make the paint thicker. These figures assume a reasonably smooth, properly prepared wall surface — rough, porous, or heavily textured walls (and any bare, unprimed new construction surface) will absorb more paint and reduce actual coverage below the manufacturer's stated figure, sometimes by 15-20%, which is worth building into your estimate as extra buffer rather than discovering it mid-project.

Primer is strongly recommended, and in some situations essentially necessary, though it isn't always required. For brand-new, unpainted plaster or freshly plastered walls, primer is important because bare plaster is highly porous and will otherwise absorb an uneven amount of your finish paint, leading to patchy colour and requiring extra coats of the more expensive finish paint to compensate — a coat of primer, which is considerably cheaper per litre than emulsion or enamel, effectively seals the surface first so your finish paint goes on evenly and you need fewer coats of it. Primer is also advisable when making a major colour change, particularly going from a dark colour to a light one, since primer (usually white or a neutral base) blocks the old colour from showing through far more effectively and economically than relying on 2-3 coats of the new, lighter paint alone. If you're simply repainting a wall in a similar colour, on a surface that's already been painted before and is in reasonably good condition, you can often skip primer and go directly to 2 coats of your finish paint. As a rule of thumb: new construction and major colour changes should budget for primer; a straightforward repaint in a similar shade on an already-painted, sound wall usually doesn't need it.

A wastage allowance of roughly 5-10% on top of your calculated paint quantity is a reasonable standard buffer, and it's worth building into your budget rather than treating it as an afterthought. Wastage comes from a few practical, largely unavoidable sources: paint left in the tray or bucket that can't be fully used, paint absorbed into brushes and rollers during loading, extra paint used around edges, corners, and trim where cutting-in requires more careful, sometimes repeated application, and colour-matching touch-ups needed after the main job if small imperfections or missed spots are noticed once the paint dries and full lighting reveals them. Rough or textured wall surfaces also consume noticeably more paint than the manufacturer's stated coverage rate assumes, since texture increases the effective surface area the paint has to cover — if your walls have visible texture (as opposed to smooth plaster), it's worth increasing your wastage buffer toward the higher end of the 5-10% range, or even slightly above it, rather than assuming standard smooth-wall coverage figures will hold.

On pure material cost, DIY painting is cheaper simply because you avoid labour charges entirely, which typically make up close to half of a professional paint job's total cost. However, this comparison misses a few practical factors worth weighing before deciding. Professional painters generally achieve smoother, more even results with fewer visible brush or roller marks, and they typically work faster, completing a full room or house in a fraction of the time a first-time DIY painter would need, since technique and experience matter considerably for a clean finish. DIY painting also carries a real risk of using more paint than a professional would for the same area, since inconsistent technique (uneven pressure, re-rolling already-painted sections, thicker-than-necessary coats) tends to increase actual paint consumption above the calculated estimate, partially or fully offsetting the labour savings. For a small, low-stakes project — a single accent wall, a child's room, or a rental you're not too precious about — DIY can be a genuinely cost-effective and satisfying option. For a full house repaint, exterior work at height, or any surface where a smooth, professional-looking finish matters (living rooms, surfaces near natural light that show every imperfection), hiring a painter is usually worth the added labour cost, both for the time saved and for a more consistent, longer-lasting result.