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Paint Calculator (2026): Gallons, Coats & Cost per Room

Enter room dimensions, coat count, and paint tier — get gallons, cost, and trim paint needed instantly.

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Gallons needed
2
269 sq ft
Total paint cost
$90
Always round up gallons. Returning paint is a hassle; running out mid-wall is worse. Premium paint needs fewer coats.

Paint pricing held roughly flat in 2026 after the 2022-2023 spikes. Benjamin Moore Regal Select and Sherwin-Williams Duration still lead the premium tier at $65-$85/gallon; Behr Ultra and Sherwin ProClassic hold the mid-tier at $42-$58; contractor-grade lines (Valspar Reserve, Glidden Premium) sit at $28-$38/gallon. Coverage is 350-400 sq ft per gallon on smooth surfaces, 250-325 on textured.

How much paint do you actually need

Standard rule: interior walls need 1 gallon per 350 sq ft on smooth drywall, 1 per 300 on textured or previously unpainted, and always plan for two coats on any color change. Ceilings need a separate flat paint rated for low-sheen. Trim, doors, and windows typically consume 1 gallon per 200-250 linear feet of trim at 2 coats.

Primer — when it matters

Prime always: new drywall, patched areas larger than a fist, stains (water, smoke, marker), tannin-heavy woods (oak, cedar), glossy surfaces being painted over with flat, and any surface going from dark to light color. Skip primer only when repainting same color over same sheen with paint-and-primer-in-one products (which work fine for light color-to-color refreshes but fail at dramatic changes).

Hiring a painter vs DIY

DIY saves 60-70% of total cost but triples time. Pro painters charge $40-$80 per hour or $3-$7 per sq ft of wall surface. A typical 12x14 bedroom (walls + ceiling + trim) runs $500-$900 to hire out, $150-$300 to DIY over a weekend. Hire pros for ceilings (hardest DIY), trim (hardest to make look good), and any room with 12+ foot ceilings that need ladders.

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Frequently asked questions

How many coats of paint do I need?
Almost always two. One coat only works when repainting the same color over same sheen with paint-and-primer products. Color changes, stain coverage, new drywall, and light-over-dark all require two coats minimum and sometimes three. Never trust 'one-coat coverage' marketing on bold colors or dramatic changes.
Premium vs contractor-grade paint — is the price difference worth it?
Premium paints (Benjamin Moore Regal Select, Sherwin Duration, Benjamin Moore Aura) hide better in one coat, resist scuffs, and wash down without polishing the finish. Over 8-10 years of wear in high-traffic rooms, they save more in touch-ups than the price premium. In closets and bedrooms, contractor-grade works fine.
What finish should I use in each room?
Ceilings: flat. Bedrooms and dining rooms: eggshell or matte. Hallways, kids' rooms, kitchens: satin or pearl (washable). Bathrooms: satin or semi-gloss (moisture-resistant). Trim, doors, windows: semi-gloss. Never use flat in wet areas — it holds moisture and mildews.
Do I need to sand between coats?
On walls, no — roller finishes don't need sanding between coats. On trim and doors (where smooth finish matters), a quick pass with 220-320 grit sandpaper between coats eliminates nibs and dust specks. Always tack-cloth after sanding.
How long does paint take to dry?
Latex paint is dry to touch in 1 hour, ready to recoat in 2-4 hours, and fully cured (washable, scratch-resistant) in 14-30 days. Oil-based paint takes 6-24 hours between coats and 7-14 days to cure. Temperature and humidity matter: below 60°F or above 75% humidity, add 50-100% to dry times.

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