Paint Calculator
Room Paint Calculator
Calculate paint needed for a rectangular room (walls)
Single Wall / Area
Calculate paint for a custom wall area
$
Formula
Gallons = (Wall Area - Doors - Windows) × Coats / 350
Frequently Asked Questions
How much area does a gallon of paint cover?
One gallon of paint covers approximately 350-400 square feet with one coat. Coverage varies by paint quality, surface texture, and application method. Most walls need 2 coats.
How do I calculate how much paint I need?
Measure the room perimeter (2 × length + 2 × width), multiply by wall height, subtract doors (21 sq ft each) and windows (15 sq ft each), multiply by number of coats, divide by 350.
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