Estimate how much paint you need for your room based on wall size, doors, windows, and number of coats.
Enter your room measurements below.
Enter your room measurements and click Calculate.
Enter the length and width of your room, wall height, number of doors, number of windows, and the number of paint coats you plan to apply. The calculator estimates the total paintable wall area and the approximate number of gallons required.
The amount of paint you need depends on the total wall area, the number of coats, the type of surface, and the coverage rate of the paint you choose. A gallon of interior paint commonly covers roughly 350 to 400 square feet for one coat, although actual coverage can vary.
Two coats are commonly used when changing colors, covering darker paint, improving consistency, or working with surfaces that need more complete coverage. One coat may sometimes be enough when refreshing a similar color with high-quality paint.
Buying a little extra can help account for surface texture, touch-ups, spills, uneven absorption, and small measuring differences. Leftover paint can also be useful for future repairs.
Explore painting and decorating services for interior and exterior home improvements in Austin, TX.
A common estimate is around 350 to 400 square feet per gallon for one coat, but coverage varies by product and surface.
Yes. This calculator estimates 20 square feet per standard door and 15 square feet per standard window.
They often can. Textured, porous, rough, or previously unsealed surfaces may absorb more paint than smooth walls.
Yes. It is generally practical to round up to the next whole gallon so you have enough for complete coverage and touch-ups.
It can provide a rough estimate, but exterior surfaces, doors, windows, siding, texture, and paint coverage may require additional adjustments.
