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Paint Calculator
One gallon covers roughly 350 square feet of smooth, previously painted wall. Fresh drywall, deep color changes, and textured walls soak up more, so this calculator adds primer when you need it.
Your numbers
Paint needed
3 gallons
- Paintable area
- 365 sq ft
- Paint (buy)
- 3 gallons2 coats
- Painter's tape
- 1 roll
- Drop cloths
- 2 9x12 cloths
- Openings are deducted at 21 sq ft per door and 15 sq ft per window.
- Textured or porous walls can use 10–20% more paint than the math shows.
Quantities are planning estimates. Verify measurements on site and buy a little extra for cuts, waste, and future repairs.
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