Paint Calculator
Calculate how much paint you need for any room. Enter room dimensions, number of doors and windows, and coats to get the exact gallons needed.
Room Dimensions
Openings & Coats
Optional Settings
Results
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Total Wall/Ceiling Area (sq ft)
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Paintable Area (sq ft)
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Gallons Needed (exact)
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Gallons to Buy
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Number of Coats
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Estimated Cost
Frequently Asked Questions
How much paint do I need for a 12x12 room?▾
A 12x12 room with 8-foot ceilings has about 384 sq ft of wall area. After subtracting a door and two windows, you need roughly 2 gallons for two coats at standard coverage of 350 sq ft per gallon.
How many square feet does one gallon of paint cover?▾
One gallon of paint typically covers about 350 to 400 square feet with one coat. Coverage varies by paint type, surface texture, and application method.
Should I include the ceiling when calculating paint?▾
Include the ceiling if you plan to paint it. Ceilings often use a different paint finish, so you may want to calculate wall and ceiling paint separately.
How do doors and windows affect the paint calculation?▾
A standard door opening is about 21 square feet and a standard window is about 15 square feet. These areas are subtracted from the total wall area since they do not need paint.
Is this paint calculator free to use?▾
Yes. This calculator runs entirely in your browser with no signup, no ads tracking, and no data sent to any server.