Paint calculator
Estimate wall paint from room dimensions, coats and the coverage on your chosen paint label.
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Enter your measurements to see an estimate.
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Formula and assumptions
Paintable wall area = 2 × (length + width) × height − openings. Paint volume = area × coats ÷ label coverage × (1 + allowance ÷ 100). Cans are rounded up after dividing by can size. Ceilings, trim and primer are not included. Coverage and can-size defaults are examples; replace them with the product label.
Estimates depend on your measurements and product labels. Confirm coverage and matching instructions before buying; these tools do not assess structural or surface safety.