Paint: Coverage, Coats & Sheens
How many gallons you need and how to pick the right finish.
Calculate paint for your project
Interior latex paint covers about 350–400 sq ft per gallon per coat on smooth walls. Rough surfaces (textured drywall, brick, masonry) drop to 200–250 sq ft/gal. Almost every job needs two coats.
Sheen affects durability and hides: flat/matte hides imperfections but scuffs; eggshell and satin are the standard for walls; semi-gloss and gloss go on trim, doors, and wet areas.
Primer is required over new drywall, bare wood, stains, and dark-to-light color changes. Self-priming paints (paint + primer) work over previously painted surfaces of the same color family.
Common uses
- Interior walls and ceilings
- Trim, doors, and cabinets
- Exterior siding and stucco
- Concrete floors and porches
Types of paint
Frequently asked
How much paint for a 12x12 room?
About 1.5 gallons for walls (2 coats) plus 0.5 gallon for ceiling.
Do I need primer?
Yes for new drywall, bare wood, or dark-to-light color changes. Self-priming paint is fine repainting the same color family.
How long between coats?
2–4 hours for latex, 24 hours for oil-based. Check the can — humidity slows drying.