Paint Calculator
Buying too little paint means a second trip to the store. Buying too much wastes money. Enter your room dimensions below and we'll tell you exactly how many gallons you need.
Enter your room dimensions
We'll subtract standard door and window areas automatically.
How to use this calculator
- Always buy a little extra — touch-ups months later are nearly impossible to color-match from a new can.
- Two coats almost always look better than one, especially over a color change or bare drywall.
- Textured walls (orange peel, knockdown) drink more paint — plan for ~15% extra coverage.
- Prime any patched drywall or stained spots first; primer is cheaper than a third coat of finish.
Common mistakes to avoid
- →Forgetting waste and overage. Most pros add 10–15% extra to cover offcuts, mistakes, and damaged material.
- →Measuring once. Always double-check critical dimensions before ordering — returns waste time and money.
- →Ignoring permits and codes. Check with your local building department before purchasing materials for any structural project.
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