Paint Calculator
The short answer for a typical 12×12 room is about 2.25 gallons for two coats. Enter your room below for your number.
How it works
Wall area is the room's perimeter times ceiling height. Standard doors (21 sq ft) and windows (15 sq ft) are deducted, the result is multiplied by coats, divided by coverage (350 sq ft per gallon), and 10% wastage is added. Purchase quantities round up to the nearest quart.
Questions
How much paint for a 12×12 room?
For a 12×12 room with 8 ft ceilings and two coats, you need about 2.25 gallons of paint (walls only, one door and one window deducted, 10% wastage included).
How many square feet does a gallon of paint cover?
One gallon of latex paint covers about 350 square feet per coat (Sherwin-Williams SuperPaint data sheet range: 350-400).