Paint Calculator
Paint needed
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How much paint, exactly
Enter room dimensions — we compute wall area, subtract doors and windows, optionally add the ceiling, multiply by coats, and divide by your paint's coverage rate. Gallons to buy (rounded to half-gallons) plus optional cost.
Frequently asked questions
How much paint per square foot?
About 350 ft² per gallon for one coat on smooth walls. Porous or first-time paint needs ~20–30% more — that's why we default to 2 coats.
Do I count the ceiling?
Only if painting it — tick the box. Ceilings drink paint (same area as the floor) and are often forgotten in estimates.
Why subtract doors and windows?
A door is ~21 ft², a window ~12 ft². On a small room they meaningfully reduce paint needed.
One coat or two?
Two, almost always — color depth and durability. One coat is only for same-color refreshes.