Calculate how many gallons of paint you need. Enter room dimensions or total area, and we'll account for doors, windows, coats, and surface type.
| Surface | Coverage (sq ft/gal) | Notes |
|---|---|---|
| Interior Wall (smooth) | 350-400 | Standard latex on painted drywall |
| Interior Wall (textured) | 250-300 | Orange peel, knockdown, popcorn |
| Exterior Wood Siding | 300-350 | Smooth to rough-sawn |
| Stucco / Masonry | 150-200 | Very porous — use elastomeric paint |
| Ceiling | 350-400 | Flat paint recommended |
| Trim / Doors | 350-400 | Semi-gloss or satin |
| Deck / Fence | 200-300 | Stain or solid color |
A gallon of paint typically covers 350-400 square feet on smooth surfaces with one coat. Textured surfaces, bare drywall, and porous materials like stucco may only get 200-300 square feet per gallon. Always check the manufacturer's coverage rate on the can.
Most jobs require 2 coats for even coverage. You may need a separate primer coat when covering dark colors, painting new drywall, or switching between oil and latex paint. Some premium paints with built-in primer can cover in one thick coat.
Measure the perimeter of the room (length + width x 2) and multiply by the wall height to get total wall area. Subtract 21 sq ft per door and 15 sq ft per window. Divide by the coverage rate (usually 350-400 sq ft/gallon) and multiply by the number of coats.
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