Plan before you buy
Get the right amount.
Skip the guesswork.
Quick material estimates for paint, flooring, concrete, mulch, and square footage.
No signupInstant resultsFree to use
Choose a project
Select one, add your measurements, and use the estimate as your shopping guide.
How the paint estimate works
For a rectangular room, wall area is the room perimeter multiplied by wall height. ProjectReady deducts about 21 square feet for each standard door and 15 square feet for each window, multiplies the remaining area by the number of coats, and divides by your paint's coverage rate.
Paint formula
Gallons = ((2 × (length + width) × height − openings) × coats) ÷ coverage per gallon
Measurements to collect
- Room length, width, and wall height in feet
- Number of doors and windows
- Number of planned coats
- Coverage per gallon shown by the manufacturer
Before you buy
Coverage varies with surface texture, color change, application method, and product. Use this result as a shopping estimate and confirm the final quantity against the product label.