Wall Paint Calculator

Calculate how many gallons of paint you need for walls based on room dimensions, window/door cutouts, and number of coats.

Results

Visualization

How It Works

Standard interior paint covers about 350-400 sq ft per gallon on smooth surfaces. Textured walls may need 20-30% more. A standard door is ~21 sq ft and a window ~15 sq ft. Always buy slightly more than calculated to account for touch-ups.