Paint Calculator
Estimate how much paint you need for a room based on wall dimensions, doors/windows, number of coats, and coverage per gallon.
Room dimensions
Sum of all wall lengths (perimeter of the room).
Paint specifications
Paintable area: sq ft
Total area with coats: sq ft
Gallons needed:
Estimated cost:
Assumptions
A standard door is deducted as ~21 sq ft and a standard window as ~15 sq ft. Coverage varies by paint brand and surface — check your paint can for exact coverage per gallon.