Incubation and Embryology - University of Illinois

Egg Sizing


Language Arts, Nutrition, Mathematics




Students will learn about eggs, chickens, and hatching eggs.


  • Different sizes of eggs from the grocer (at least two eggs per size)
  • poster of egg sizes
  • egg sizing handout


  1. Eggs, like people and chickens, come in different sizes. We'll learn the difference between a jumbo and a pee-wee egg. This will help us get the most for our egg money.
    Explain the size scale of eggs using the poster.
    30 oz per dozen eggs = jumbo
    27 oz per dozen eggs = extra large
    24 oz per dozen eggs = large
    21 oz per dozen eggs = medium
    18 oz per dozen eggs = small
    15 oz per dozen eggs = pee wee
    You may also use matching cards to reinforce these concepts.
  2. Pass out handout on egg sizing. Allow students to match the egg to its size.
  3. Break out eggs and place each size egg in front of the same-sized unbroken egg.
  4. Discuss weight by dozen. How many in a dozen? If we divide the weights by 12 we can calculate the weight of each individual egg.

Discuss the 7 cent rule: When buying eggs, if the price increase for the next larger size is 7 cents or less per dozen, then the larger size is the better deal because you get more egg for your money.

Make up some examples and determine which eggs would be the best buy. Remember:

When large eggs are 90 cents a dozen, they are only 60 cents a pound. Which size egg would cost the most in the store? The least? Why?

Encourage the students to look at the egg display the next time they are at the grocery store. Have them report on which is the best deal.

Return to Lesson Plans