Enter your room's length, width, and height, then tell the Paint Calculator how many doors and windows to subtract, whether to include the ceiling, and your number of coats — and you'll get your total paint needed, broken down by wall area, ceiling area, and estimated cost.
Paint Needed
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Total Paintable Area
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Wall Area
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Ceiling Area
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Estimated Cost
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Measure the length, width, and height of your room. The calculator determines wall area by multiplying perimeter by height, then subtracts door and window areas. Standard paint covers 300-400 square feet per gallon.
Only include the ceiling if you plan to paint it. The calculator allows you to check the 'Paint Ceiling' option to include ceiling area in your total square footage calculation.
Most painting projects require 2 coats for even coverage and color depth. Light colors over dark surfaces may need 3 coats, while some premium paints provide good coverage in 1 coat.
The calculator uses 21 square feet per door (standard 3' x 7') and 12 square feet per window (standard 3' x 4') to subtract from the total wall area.
It's recommended to buy 10-15% more paint than calculated to account for touch-ups, waste, and application variations. The calculator provides the minimum amount needed.
Yes, premium paints often cover 400+ square feet per gallon, while basic paints may only cover 250-300 square feet. Primer typically covers less area than finish paint.
The calculator supports both units. For reference: 1 meter = 3.28 feet, and 1 square meter = 10.76 square feet. Always use the same unit system for all measurements.
Surface texture, application method, paint quality, and color changes can all affect consumption. Rough surfaces, rollers vs sprayers, and dramatic color changes typically require more paint than smooth surfaces and similar colors.