How paint coverage changes by surface — one gallon covers ~375 sq ft on smooth siding but only ~175 on rough stucco
One gallon spreads ~375 sq ft on smooth siding but only ~175 on rough stucco — nearly 2× difference. The surface’s texture and porosity, not the gallon math, is what throws off most paint estimates.
What this diagram shows
A comparison of how far one gallon of exterior paint spreads on different surfaces, shown as bars scaled to the coverage. Smooth, non-porous vinyl or metal siding reaches about 375 square feet per gallon; new wood about 325; fiber cement about 300; smooth stucco about 275; brick about 250; and rough stucco only about 175 square feet per gallon. Rough, porous surfaces drink paint, so coverage varies nearly two to one — and bare or weathered surfaces soak up even more on the first coat. The surface, not the gallon math, is the number-one reason paint estimates come up short.
Exterior Paint Calculator
Instantly calculate exterior paint gallons for siding, trim & doors. Includes primer + 2-coat totals for vinyl, wood, stucco & brick. Free, no signup.
Related diagrams
Paint & WallpaperWallpaper bolt vs single roll — one bolt is two single rolls
Paint & WallpaperHow wall texture and paint grade change interior-paint coverage
Paint & WallpaperInterior paint take-off — walls and ceiling are figured separately