Paint Calculator
Estimate gallons of paint needed.
Keep or share the finished result
Copy or share after running the tool. Saved tools and settings stay in this browser.
What would you like to do next?
Estimate paint needed
Painting projects are easier to budget when you know the approximate gallons needed before you shop. Enter wall area, number of coats, coverage per gallon and waste percentage to estimate paint quantity. It works for rooms, accent walls, furniture projects and quick material planning.
Plan paint with a buffer
Coverage depends on paint type, wall texture, color changes and primer, so check the product label and keep a small buffer.
Frequently asked questions
How many square feet does a gallon cover?
Many paints cover around 300 to 400 square feet per coat, but the label is the best source.
Should doors and windows be subtracted?
Yes, subtract large openings from the wall area if you want a tighter estimate.
Does this include primer?
No. Add primer as a separate coat if needed.