Quick answer
One gallon of paint often covers 350-400 square feet on smooth surfaces, but textured walls, masonry, rough siding, dark color changes, and primer needs can reduce coverage.
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Smooth drywall
Often 350-400 square feet per gallon per coat.
Textured or porous surface
Coverage can drop to 250-300 square feet per gallon.
Color changes
Dark-to-light changes often need primer or extra coats.
Common questions
How much does one gallon of paint cover?
Usually 350-400 square feet per coat on smooth, primed surfaces.
Do rough surfaces need more paint?
Yes. Rough or porous surfaces absorb more paint and reduce coverage.