Finishing calculator
Paint Calculator
Estimate paint required for walls while allowing for doors and windows.
Your measurements
Estimated result
Paintable wall area0 sq ft
Area including coats0 sq ft
Paint required0 gal
Whole gallons to buy0 gal
Planning estimate only. Check product specifications, site conditions and local codes before ordering or building.
Paint quantity formula
Paintable wall area = perimeter × wall height − openings. Paint required = paintable area × coats ÷ coverage per gallon.
Planning notes
Coverage on the paint can is the best value to use. Rough or porous surfaces, dramatic color changes and first coats on new material can all reduce real-world coverage.
- Coverage varies with surface texture, colour change and product.
- Primer is usually calculated separately from finish coats.
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