Room Paint Gallon Estimator
Skip the guesswork and the second trip to the store. Enter your room’s measurements and get the exact number of gallons to buy, adjusted for doors, windows, coats, and how much prep your walls actually need.
▸ Advanced settings
Painting three walls one color and a feature wall another? This mode splits your gallons and cost between the two paints. Openings are assumed to be spread across the main walls for simplicity, so for exact door and window placement, use Single Room instead.
▸ Advanced settings
Repainting the whole place? Add every room and get one shopping list. This mode uses standard door and window sizes for speed; use Single Room for exact openings.
▸ Advanced settings
Quick Reference Grid: Room Size vs. Gallons
Based on 9-foot ceilings, 2 coats, one door, two windows, and standard coverage. Use the calculator above for your exact room.
| Room size | Wall area | Gallons needed | Suggested purchase |
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Frequently Asked Questions
Use Our Other Tools
Planning the rest of the color scheme while you’re at it? These pair naturally with your paint project.
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