Per USDA standards, a dozen small eggs weigh at least 18 ounces, which is around 1.5 ounces per egg. A dozen medium eggs should weigh a minimum of 21 ounces, which is around 1.75 ounces per egg. A dozen large eggs weighs at least 24 ounces, which is 2 ounces per egg on average. Extra-large eggs should weigh a minimum of 27 ounces for a dozen, which is an average of 2.25 ounces per egg. Jumbo eggs weigh at least 30 ounces per dozen, which is around 2.5 ounces per egg. Learn more about Chickens.