Paint Calculator
Find out exactly how much paint you need for your project. Enter your wall dimensions, number of coats, and how many doors and windows to subtract, and we'll calculate the gallons and liters required.
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Paint Calculator
construction calculator
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How It Works
Formula
Paintable Area = (Wall Length × Height) − Doors − Windows Gallons = (Area × Coats) ÷ 350
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Examples
40 ft walls, 8 ft high, 2 coats
About 1.6 gallons needed.
Frequently Asked Questions
How much does a gallon of paint cover?
One gallon of paint typically covers about 350 square feet with one coat. Coverage varies by paint type, surface texture, and color change.
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How many coats of paint do I need?
Two coats is standard for most walls and gives the best, most even finish. You may need a third coat when covering a dark color with a lighter one.
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