Enter room dimensions and openings, toggle ceiling and primer gallons for every coat update live.
−21 sq ft each
−15 sq ft each
One coat @ 350 sq ft/gal on bare surfaces.
Labor (optional)
Wall paint to order
3
GALLONS
Bill of materials+0% waste
Interior wall paint
1 × 5-gal pails @ 350 sq ft/gal
Net 397 sq ft · Waste 2 coats
Ceiling paint
Net 192 sq ft · Waste 2 coats
Net paintable area
51 sq ft deducted (doors/windows)
Net — · Waste —
Cost projection
Saved on this device · No account · No cloud
Total · $199.00
3 gal
Net wall area = 2 × (L + W) × H minus 21 sq ft per door and 15 per window. Ceiling = L × W.
Enter room dimensions and openings, toggle ceiling and primer gallons for every coat update live.
Gallons always round up paint is sold by the gallon, and a short gallon stops the job.
Primer covers ~350 sq ft/gal on bare drywall; two finish coats is the standard for fresh work.
Gal = net area ÷ 350
A 12x16 ft room with 8 ft ceilings has 448 sq ft of wall; minus one door (21) and two windows (30) leaves 397 sq ft net. Two coats at 350 sq ft per gallon rounds up to 3 gallons.
About one gallon covers 350 sq ft per coat on smooth drywall — roughly 300 on rough or textured surfaces and up to 400 on smooth previously painted walls.
Yes on bare drywall. One coat of primer at about 350 sq ft per gallon seals the surface so finish coats cover evenly; two finish coats is the standard for fresh work.
397 sq ft of net wall after openings, times two coats, is 794 sq ft — divided by 350 sq ft per gallon and rounded up, that is 3 gallons.
Yes. It subtracts 21 sq ft per door and 15 sq ft per window from the wall area before computing gallons, so you never buy paint for openings.
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