Britannica
Sources used in this answer
How are egg sizes determined in the United States?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
egg
Brown eggs.
In the United States, egg sizes are determined based on a minimum weight per dozen, measured in ounces.1
Automated machines at central processing plants sort eggs into these specific weight categories. Common standards include:1
- Extra Large: 27 ounces (765 grams) per dozen1
- Large: 24 ounces per dozen1
- Medium: 21 ounces per dozen1
While these weight-based standards are used in the U.S., measurement systems in other countries often vary and may utilize metric units.1