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Paint Calculator

Paint quantity depends on wall area, number of coats and the coverage of the specific paint. This calculator subtracts openings and rounds up to whole gallons.

Your result appears here after you press Calculate.

How it is calculated

  • Wall area = 2 × (length + width) × height.
  • Openings = doors × 20 sq ft + windows × 15 sq ft (typical sizes).
  • Paint area = (wall area − openings) × coats.
  • Gallons = paint area ÷ coverage per gallon, rounded up.

Assumptions and limits

  • Coverage of about 350 sq ft per gallon is a common label figure, but check your can.
  • Textured or unprimed surfaces absorb more paint. Ceilings are not included.

Material estimates are for planning and ordering guidance. Coverage, yield and dimensions vary by product, so check the manufacturer's labeling. Structural work, roofing at height and code compliance should be handled by qualified professionals and confirmed with your local building department.

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