Free tool
Paint Calculator
Figure out how many gallons a room needs based on wall area, coats, and openings — before you buy one can too many.
Wall area416 sq ft
Paintable area366 sq ft
Gallons to buy3
Good to know
- One gallon covers roughly 350 sq ft per coat on smooth, primed walls.
- Color changes (especially dark to light) usually need two coats plus primer.
- Ceilings and trim are separate — this calculates walls only.
Want the full picture, not just materials?
Describe the project and get a contractor-style planning estimate — scope, labor, materials, and a realistic range — free.
Planning estimates based on standard rules of thumb. Actual material needs vary with site conditions, product dimensions, and installation method — confirm quantities with your contractor or supplier before ordering.