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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.
1 Exterior paint averages $25-$40 a gallon, and a 3,000-square-foot home takes 15 or more gallons of paint, or $375-$600 just for the paint. However, it's possible to paint a large, two-story house for materials-only costs of $400-$600. 2  When hiring a painting contractor, paint and supplies make up about 15-25 percent of the cost, while 75-85 percent goes for labor.