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A: Ron Joseph of the Paint and Coatings Resource Center estimates that a gallon of paint weighs roughly 10 pounds. To determine approximately how much 5 gallons of paint weighs, multiply 10 pounds by 5 to get 50 pounds of paint per 5-gallon bucket.
In general, you can expect 1 gallon of paint to cover about 350 square feet. You need slightly more than a gallon if the walls are unpainted drywall, which absorbs more of the paint.