Calculate how many gallons of paint you need for walls, rooms, and ceilings. Accounts for doors, windows, and coats.
gallons of paint
| Gross Wall Area | 396 ft² |
| Net Paintable Area | 346 ft² |
| Ceiling Area | 0 ft² |
| Total Area (all coats) | 692 ft² |
| Gallons Needed | 2.0 gal |
| Full Gallons to Buy | 2 gal |
Buy an extra quart for touch-ups. Keep the label for color matching later.
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Wall Area = 2 × (L + W) × H
Net Area = Wall Area − Doors − Windows
Gallons = (Net Area × Coats) ÷ Coverage
One gallon typically covers 350–400 sq ft. Use 350 sq ft for rough/porous surfaces, 400 for smooth.
Most jobs need 2 coats. Dark colors over light or new drywall may need 3 coats.
Add all wall areas (length × height), subtract doors (~20 sq ft each) and windows (~15 sq ft each). Divide by coverage per gallon.
Ceiling paint is typically different. Use the room's length × width for ceiling area separately.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.