Bedroom Paint Calculator
Quick answer: For most bedrooms, start with the wall area in square feet, divide by paint coverage per gallon, then multiply by the number of coats. Add a small buffer for touchups.
Enter your wall area to get started.
Paint coverage formula
(Wall Area ÷ Coverage per Gallon) × Coats, then add 5–15% extra for waste and touchups.
How to use this calculator
Enter the estimated wall area, number of coats and paint coverage listed on the can. Most interior wall paints cover about 300–400 square feet per gallon, but textured walls, dark colors and primer needs can change the final amount.
Tips before buying paint
- Measure each wall and multiply width by height.
- Subtract large doors and windows if you want a tighter estimate.
- Round up to the nearest gallon so you have enough for touchups.
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Frequently Asked Questions
How do I calculate paint for a room?
Multiply wall width by height for each wall, add the areas together, divide by coverage per gallon, then multiply by the number of coats.
Should I buy extra paint?
Yes. A 5–15% buffer helps cover mistakes, texture, touchups and color changes.
Does this calculator work on mobile?
Yes. It runs in your browser and works on phones, tablets and desktop browsers.