Paint calculator for walls
This paint calculator for walls estimates how many gallons you need: enter the total wall area in square feet, choose one or two coats, and get your answer — based on standard coverage of about 350 sq ft per gallon.
Paint calculator for walls FAQ
How many square feet does a gallon of paint cover?
About 350 sq ft per coat on smooth walls — the standard figure this paint calculator for walls uses. Rough or porous surfaces may need more.
How do I measure my wall area?
Multiply each wall's width by its height and add them together. Subtract large doors and windows (about 20 sq ft per door, 15 per window) for a tighter estimate.
Do I really need two coats?
Two coats give even color and better durability, especially over dark colors or repairs. One coat can work for touch-ups or same-color repaints.
Does ceiling paint use the same math?
Yes — measure the ceiling area the same way. Ceilings often need flat paint, but the coverage per gallon is similar.
Should I buy extra paint?
Rounding up to the full gallon, as shown above, already builds in a buffer for touch-ups later.