: Subtract the area of windows (approx. 15 sq. ft. each) and doors (approx. 20 sq. ft. each).
: Divide the resulting total square footage by 350–400 square feet , which is the average coverage for one gallon of paint. how do you know how much paint to buy
An interesting way to get a hyper-accurate estimate—especially for unique surfaces—is to roll out a in a discreet area first. This "real-world" measurement factors in exactly how much paint your specific wall texture, porosity, and previous colors consume, which can vary significantly from the theoretical "400 square feet per gallon" listed on the can. Factors That Change Your Calculation : Subtract the area of windows (approx