Paint Calculator
Estimate paint for a room's walls and ceiling. Enter wall dimensions, openings, number of coats and the coverage rate on your paint can.
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How the paint calculator works
Estimate paint for a room's walls and ceiling. Enter wall dimensions, openings, number of coats and the coverage rate on your paint can.
Paintable area = wall area + ceiling area − openings. Required paint = paintable area × coats ÷ coverage. The calculator is designed to give a useful first-pass material estimate while keeping the assumptions visible. For a purchase, compare the result with the product packaging or supplier quotation.
Common search terms for this tool include paint calculator, wall paint calculator, how much paint do I need, paint coverage calculator. The wording is included naturally so the page answers the same questions people ask when planning a project.
Frequently asked questions
Does paint coverage vary?
Yes. Coverage depends on the product, surface, color, texture and application method. Use the coverage printed on the can.
Should I count the ceiling?
Only when you plan to paint it. The calculator lets you include or exclude ceiling area.
How do I account for doors and windows?
Enter the number and average size of each opening to subtract them from wall area.
Do I need two coats?
Use the number of coats recommended for your paint and surface.