Free Paint Calculator - Calculate How Much Paint You Need
Calculate how much paint you need for your room with multiple coat and color options.
Formula & Methodology
Standard premium paint covers approximately 400 square feet per gallon. Porous surfaces may require more.
- Gallons = (Total Wall Area × Coats) / 400
Worked Example
Using the Paint Calculator: apply the formula above to your input values. For instance, Gallons = (Total Wall Area × Coats) / 400. The tool performs each step instantly and shows the result.
Frequently Asked Questions
How much paint do I need?
It divides your total wall area by a gallon’s coverage (about 350 sq ft) and accounts for the number of coats.
How many coats should I plan for?
Two coats is standard for even color and coverage, especially over darker or uneven surfaces.
Should I subtract doors and windows?
For rough estimates you can ignore small openings, but subtracting large ones avoids buying excess paint.