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Paint Coverage Calculator
Work out how much paint you need from the wall area, number of coats and paint coverage.
Total wall area
Number of coats
Coverage per gallon
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How it works
Gallons = area × coats ÷ coverage per gallon, plus ~10% waste
Paint quantity is the area to cover times the number of coats, divided by how much a gallon spreads. A gallon typically covers 350–400 ft²; add about 10% for touch-ups and uneven surfaces.
Worked example
400 ft² at 2 coats and 350 ft²/gal is about 2.3 gallons, so buy 3.
Frequently asked questions
How do I find wall area?
Multiply each wall’s width by its height and add them, then subtract large doors and windows.
Do primers count?
Yes — primer is a separate coat with its own coverage. Calculate it separately.
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This calculator is for educational purposes. Double-check important results before acting on them.