Shrimp are graded by the seafood industry and commercial brands in different terms, and it can be confusing. Next time you are at the seafood counter, the fresh shrimp on ice will be labeled and this will help you purchase pounds of shrimp from your favorite grocery stores. Another great option is to buy high quality preferably wild shrimp that is flash frozen at the peak of freshness. A good average serving size* per person is about 4 ounces of shrimp, here is a way to know what the package means: Extra Colossal U/10 2-3 serving Super Colossal U/12 2-3/serving Colossal U/15 3-4/serving Extra Jumbo 16/20 4-5/serving Jumbo 21/25 5-6/serving Extra Large 26/30 6-7/serving Large 31/35 8-9/serving Medium Large 36/40 9-10/serving Medium 41/50 10-12/serving Small 51/60 12-15/serving Extra Small 61/70 15-17/serving Tiny 71+ 18+/serving