Construction calculator answers

Paint Coverage by Surface Type

Estimate paint coverage for smooth drywall, textured walls, brick, exterior siding, primer, and multiple coats.

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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Comparison

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.