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Paint Calculator
Estimate wall paint from room dimensions, openings, coat count and product coverage.
Choose a unit system and enter the coverage figure from your paint label. Openings use editable average areas so you can make the estimate more realistic.
Formula
Paintable wall area = 2 × (length + width) × height − openings. Paint quantity = paintable area × coats ÷ product coverage.
This calculator does not include ceilings or trim. Coverage changes with porosity, texture, application method and product.