INTERIORS & FINISHING
Paint Gallon Estimator
Estimate the paint needed for your project. Enter the area to cover and the number of coats. The calculator estimates gallons using its coverage rate. Add a price per gallon to calculate material costs. Use the estimate to plan your paint purchase.
How to Calculate Paint Gallon Estimator
The estimator multiplies the entered surface area by the number of coats, divides by its 350-square-foot-per-gallon coverage assumption, and rounds up to whole gallons.
- Coverage needed = surface area x number of coats.
- Gallons = round up(coverage needed / 350 square feet per gallon); estimated material cost = gallons x price per gallon.
Frequently Asked Questions
Does one gallon always cover 350 square feet?
No. Coverage varies by paint, surface texture, color change, application method, and substrate condition. Check the product label and consider a primer or extra coat where needed.
Why does the result round up to a whole gallon?
The estimate rounds up to avoid planning a fractional gallon purchase. Actual packaging sizes and available quantities vary by product.