Use our painting calculator to take the guesswork out of buying supplies. This free paint estimator tool is a great way to make sure you don't buy too much or too little product for your next paint project. Plus, you can use it to figure out your average paint job cost per square foot.
Ready to tackle a paint job? Don't get started until you've used our painting calculator to determine how much paint you'll need. After all, few things are worse than getting halfway through your project and realizing you're a few gallons short.
To use the painting calculator, simply plug in your wall area, the number of doors and windows, the manufacturer's estimate, and the condition of your walls. You may need to adjust the results depending on the painting method you plan to use, any trim you're adding, or the quality of the paint.
You can also use this tool as a paint cost estimator. Our paint calculator takes square feet into account, so you can estimate the total cost of the project based on cost per can, or determine the painting charge per square foot.
Wall area sq.ft. Number of doors doors Number of small to medium-sized windows (10 to 14 square feet) small windows Number of large windows (up to 20 square feet) large windows Manufacturer's estimate of square feet covered by a gallon sq. ft./gal
Condition of wall surface (choose one)
Poor (porous, and/or with patched areas) Good (well covered with paint that has at least a slight gloss)
Gallons of paint needed per coat gal./coat
Editor's Tip: Every effort has been made to ensure the accuracy of this calculation. But before purchasing materials for any project, please check amounts with your suppliers or contractors.
Your interior painting estimate (and, ultimately, the interior painting cost per square foot for your project) can depend on more than just the size of your wall. Add-ons, special wall treatments, and more all influence the total amount of paint you'll need. The following tips will help you take these additional costs into account:
Just like interior painting, bonus features and unusual techniques can sway the results of our exterior painting estimate. The following tips will help you adjust for painting methods, project conditions, and extra features.