How much can one gallon cover?
A common planning value is 350 square feet per gallon, but labels vary by product.
Paint Calculator
Estimate how many paint gallons to buy using room size, coats, and your selected waste allowance.
Assumptions
- Room area uses wall perimeter x height.
- Waste allowance is applied after coat multiplication.
- Result rounds up to support purchase planning.
- Cost range uses the entered unit cost as a base estimate with a simple planning spread.
How to use
- Enter room length, width, and wall height.
- Choose number of coats and paint coverage.
- Add waste allowance and optional cost per gallon.
- Run the calculator to get gallons and estimated cost.
FAQ
Related calculators
These are planning estimates. Surface texture, primer, and application method can materially change real usage.