Work out how many gallons or liters of paint a room needs from the wall size, doors, windows, ceiling and number of coats, and which cans to buy.
About this tool
Work out how many gallons or liters of paint a room needs.
How to use Paint Calculator
- Enter the total wall length and height, doors and windows.
- Add the ceiling if needed, the coats and the coverage.
- Read the paint needed and the cans to buy.
Worked example
A 14 × 10 ft room with 8 ft walls needs about 7 liters, or 2 US gallons, for two coats.
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.
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