How is egg size determined?

Egg size is primarily determined by weight. The weight of an egg provides a more consistent and reliable measurement compared to other factors like diameter, color, or shape. The weight classification system for eggs, such as jumbo, extra-large, large, medium, small, and peewee, is based on specific weight ranges. This classification is crucial for the market as consumers often seek certain sizes for their cooking and baking needs, influencing their purchasing decisions. Weight directly correlates to the amount of content inside the shell, which is an important factor for both consumers and producers.

Diameter, while it can provide some information about the physical size of the egg, does not take into account the volume and mass of the egg as effectively as weight does. Color and shape can vary widely among different breeds and do not relate to the egg's size or its classification in commercial markets.