Paint Calculator
How many gallons of paint does a room need? Enter the room size, doors and windows, coats, brand, finish, surface and region — get a gallon and cost range, not a single guessed number.
Paint for 301 sq ft of wall (2 coats)
1.75–1.75 gal — 6.6–6.6 L
$42–$91 — estimated paint cost
Paintable area: 301 sq ft (28.0 sq m) — wall area minus doors and windows. Coverage for this surface and finish: 350–400 sq ft per gallon. Price per gallon: $24–$52. Buy the high end of the range if the walls are dark, patched or unprimed.
Estimate — check the can label and current shelf price. Coverage varies by brand, finish and surface, and prices vary by store and region. The range above is a planning figure, not a quote.
Formula used: Paintable area = 2 × (length + width) × height − doors × 21 − windows × 15 sq ft. Gallons = area × coats ÷ coverage (sq ft/gal), rounded up to the nearest quart.
How this estimate works: Wall area is the room perimeter times the ceiling height, minus a standard door (21 sq ft) and window (15 sq ft) for each opening. Gallons come from dividing by the coverage range for your surface and finish — textured or masonry surfaces drink far more paint than smooth drywall — and cost multiplies gallons by the brand's price range for your region.
How the paint calculator works
Wall area is the room perimeter times the ceiling height, minus a standard door (21 sq ft) and window (15 sq ft) for each opening. Gallons come from dividing that area by the coverage range for your surface and finish — textured or masonry surfaces can take twice as much paint as smooth drywall — and cost multiplies gallons by the brand's price range for your region. The result is a range, not a single number, because no two brands cover the same and no two stores charge the same. Estimate — check the can label and current shelf price before buying.
Try next: Paint Cost Calculator · Ceiling Paint Calculator · Trim and Door Paint Calculator
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