๐งฑ Construction
Paint Room Calculator
Paint is calculated from the paintable wall area, which is the perimeter times the height minus doors and windows. A door takes about 20 square feet and an average window 15, and a ceiling almost always needs its own coat.
How it works
Room length
Room width
Wall height
Number of doors
Number of windows
Number of coats
Paint the ceiling
Coverage per gallon
Wall area
Ceiling area
Paintable area per coat
Gallons needed
Cans to buy
Frequently asked questions
How do I use the Paint Room Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.