Determining The Size Of An Egg
Quality and Weight (Size) Assurance
Most eggs are packed according to official U.S. quality grade standards and weight (size) classes. The grade and weight (size) are printed on the egg carton.
The USDA grade shield on the carton means that the eggs were graded for quality and checked for weight (size) under the supervision of a technically trained USDA grader. USDA’s grading service is voluntary; egg packer’s who request it, pay for it. Compliance with grade, weight (size), and sanitary requirements is monitored by USDA.
Egg packers who do not use the USDA grading service will put terms such as “Grade A” on their egg cartons without the shield. Their compliance with grade, weight (size), and sanitary requirements is monitored by State agencies.
Eggs of any weight (size) may differ in quality. Size tells you the minimum required net weight per dozen eggs. Size does not refer to the dimensions of an egg or how big it appears.
- Jumbo = 30 oz per dozen
- Extra Large = 27 oz per dozen
- Large = 24 oz per dozen
- Medium = 21 oz per dozen
- Small = 18 oz per dozen
- Peewee = 15 oz per dozen
Grades are called AA, A, and B. There is no difference in nutritive value between the different grades. The only difference is that these eggs rate different in appearance. Therefore Grade B eggs rarely find their way to a supermarket. Grade AA egg will stand up tall. The yolk is firm and the area covered by the white is small. There is a large proportion of thick white to thin white. Grade A egg covers a relatively small area. The yolk is round and upstanding. The thick white is large in proportion to the thin white and stands fairly well around the yolk. Grade B egg spreads out more. The yolk is flattened and there is about as much (or more) thin white as thick white.