Paint Calculators
Size gallons from room or house dimensions, door and window openings, coats, and coverage. Interior uses smooth vs textured; exterior uses substrate, sheen, and weather. Primer stays on its own line.
Quantity calculators
- Paint CalculatorCalculate paint gallons from room size with door and window openings subtracted, coats, and smooth vs textured coverage. Primer listed separately. Free US interior tool.
- Exterior Paint CalculatorCalculate exterior paint gallons from house footprint, openings, substrate (wood, fiber cement, stucco, masonry), sheen, and weather exposure. Primer listed separately. Free US tool.