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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.
By U.S. standards, the weight of a gallon is 8.34 pounds per gallon, if we want to be real precise we can expand the significant figures to 8.345404 pounds per gallon. But that'snot really what we see in the manufacturing process as a gallon may be +- an oz or 2.