In order to answer the question of how much does a gallon of milk weigh we must first determine which gallon unit you re-measuring in. The most common three gallon units used in measurements are the U.S. liquid gallon, the U.S. dry gallon, and the U.K. gallon. Navigate The Post1 U.S. Liquid Gallon2 U.S. Dry … Continue reading How Much Does a Gallon of Milk Weigh?