How to tell the difference between Grade A egg quality, Grade AA egg quality, and Grade B egg quality plus Watch our Featured Video: How are eggs graded? Dianne, and egg farmer near London, Ontario. If you are selling your eggs you are required to grade them. For small backyard flock owner's and commercial egg producers, this will make it easy for you to determine what grade eggs you have.
Differences Between Egg Grades A, AA, and B

Every carton of eggs you sell must be labeled with a grade. Large commercial egg producers will need to hire a professional to grade their eggs but the regular backyard flock owner who sells a few eggs to earn enough money to feed their chickens this will make it easy to understand how to grade your eggs. You will need to examine the outside of your eggs and candle your eggs to see the inside to determine which grade eggs you have. Here is what to look for:
Grade AA Egg Quality
Shell should be clean, unbroken, and normal looking. The air cell inside the egg should be 1/8" or less in depth and should have unlimited movement and move freely. The egg white should be clear and firm. The egg yolk should be clearly defined and have no defects.
Grade A Egg Quality
Shell should be clean, unbroken and normal looking. The air cell inside the egg should be 3/16" or less in depth and have unlimited movement with the ability to move freely. The egg white should be clear and reasonably firm. The egg yolk should be outline should be fairly defined and free of defects.
Grade B Egg Quality
Shell should be clean, may be slightly stained, should be unbroken, shell may be abnormal in shape. The air cell is over 3/16" in depth, has unlimited movement with the ability to move freely. The egg white is weak and watery, blood or meat spots may be present. The egg yolk is clearly visible, enlarged or flattened, visible germ development or other defects (1).
Grade AA Egg Quality
Shell should be clean, unbroken, and normal looking. The air cell inside the egg should be 1/8" or less in depth and should have unlimited movement and move freely. The egg white should be clear and firm. The egg yolk should be clearly defined and have no defects.
Grade A Egg Quality
Shell should be clean, unbroken and normal looking. The air cell inside the egg should be 3/16" or less in depth and have unlimited movement with the ability to move freely. The egg white should be clear and reasonably firm. The egg yolk should be outline should be fairly defined and free of defects.
Grade B Egg Quality
Shell should be clean, may be slightly stained, should be unbroken, shell may be abnormal in shape. The air cell is over 3/16" in depth, has unlimited movement with the ability to move freely. The egg white is weak and watery, blood or meat spots may be present. The egg yolk is clearly visible, enlarged or flattened, visible germ development or other defects (1).
There are six different sizes of chicken eggs recognized by USDA. Egg size is determined by weight.
References
1. Commercial egg processing.Retrieved on Nov. 15. 2016 from U. S. Poultry.org. https://www.uspoultry.org/educationprograms/PandEP_Curriculum/Documents/PDFs/Lesson8/EggProcessingPres.pdf
1. Commercial egg processing.Retrieved on Nov. 15. 2016 from U. S. Poultry.org. https://www.uspoultry.org/educationprograms/PandEP_Curriculum/Documents/PDFs/Lesson8/EggProcessingPres.pdf