Chicken eggs weigh between 33 and 75 grams when laid, of which 90% is edible and the rest is the shell. Eggs may loose moisture when not stored correctly. Every country has it’s own standards and regulations how eggs are sized and packed, and in south Africa these things are regulated by the agricultural product standards act, as amended from time to time: Jumbo eggs weigh more that 66grams X-large eggs weigh more than 59grams Large eggs weigh more than 51grams Medium eggs weigh more than 43 grams Small eggs weigh more than 33 grams.