Wall Paint Calculator — Exact Gallons Needed Per Room

Walls to paint (add as many as needed)

Wall description

Length (ft)

Height (ft)

Remove

Tip: measure to the nearest 0.1 ft; subtract large windows/doors below.

Subtract openings (doors/windows total area)

Coats and paint selection

Price per gallon (optional)

Add each wall with its length and height. Repeat until all walls you will paint are listed.
Enter total area of doors and windows to subtract from the surface area; leave zero if none.
Choose coverage per gallon or enter a custom coverage figure that matches your paint brand.
Set number of coats; two coats are typical for most color changes and new drywall.
Optional: enter price per gallon to get an estimated material cost. Click Calculate to see gallons and cost.