Paint & Finishes
Paint & Finishes Calculators
Free paint calculators for any room, exterior, or repaint job. Get gallons for walls, ceiling, primer, and trim — with door and window subtraction built in.
2 calculators · 5 reference pages
All Paint & Finishes calculators
Reference
Quick answers for paint & finishes
Quick answer
How Much Paint Do I Need?
Most rooms need 2 to 3 gallons of paint for two coats. A standard bedroom needs 2 gallons; a large living room with cathedral ceilings can need 4–5.
Quick answer
How Many Square Feet Does a Gallon of Paint Cover?
A US gallon of paint covers about 350 square feet in one coat on smooth, primed drywall. Textured or porous surfaces drop coverage to 250–300 ft².
Quick answer
How Much Does a Gallon of Paint Cost?
A gallon of interior paint costs $30 to $60 in 2026. Premium and exterior paints reach $60–$100 per gallon. Five-gallon buckets typically save 15%.
Quick answer
How Many Square Feet Does a Gallon of Paint Cover?
One gallon of interior latex paint covers about 350 square feet per coat — roughly the wall area of a small bedroom.
Quick answer
How Much Does 1 Gallon of Paint Cover?
One gallon of interior latex paint covers about 350 square feet per coat — enough for a small bedroom (12×12) with one coat on the walls.
FAQ
Frequently asked
A gallon of interior paint covers about 350 ft² per coat on smooth drywall, 250 ft² on textured surfaces. Most jobs need two coats — buy by the 5-gallon bucket for the best per-gallon price.
Spot-prime patched drywall and stained spots. Full primer is only needed when going from a much darker color to a lighter one or when painting bare wood/metal.