In the U.S. eggs are sized as follows: Jumbo= greater than 2.5 ozs. Very large = < than 2.25 ozs. Large = < than 2.0 ozs. Medium = < than 1.75 ozs. Small= < than 1.5 ozs Pee Wee = < than 1.25 ozs. My ISA Browns are now laying large eggs! They have increased in size since labor day. I am so proud!