Paint Calculator
Estimate wall paint needed for a rectangular room. This calculator covers the four walls only; it does not include the ceiling or floor.
Total paintable area × coats
Calculated paint needed
Minimum whole-unit purchase
Formula: [2 × (length + width) × wall height − doors/windows] × coats ÷ coverage rate. Coverage varies by product, surface porosity, colour change and application method. Use the coverage printed by the paint manufacturer when available.