Paint Calculator
Work out how many gallons or liters of paint a room needs.
Enter your values to see the result.
Continue your work
- Drywall Calculator — Estimate new drywall.
- Wallpaper Calculator — Compare with wallpaper.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Paint Calculator
Work out how many gallons or liters of paint a room needs.
- 1 Enter the total wall length and height, doors and windows.
- 2 Add the ceiling if needed, the coats and the coverage.
- 3 Read the paint needed and the cans to buy.
Example and practical tips
A 14 × 10 ft room with 8 ft walls needs about 7 liters, or 2 US gallons, for two coats.
Frequently asked questions
How far does a gallon go?
About 350–400 sq ft per coat on smooth walls.
Do I need two coats?
Usually, especially over a different color or new drywall.
Report an issue
Something broken or not quite right? Tell us and we will look into it.