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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.
For old paint in good condition or primed, bare wood, you'll need about one gallon of paint per each 400 square feet. To determine how much you'll need overall, measure the space to be painted and calculate the area in square feet. Divide the area by 400 to get the number of gallons per coat.