What is the weight difference between a size 10 chicken and a size 12 chicken?

The weight difference between a size 10 and a size 12 chicken typically ranges from about 1 to 2 pounds. Size 10 chickens generally weigh around 4.5 to 5.5 pounds, while size 12 chickens weigh approximately 5.5 to 6.5 pounds. Thus, the difference can vary based on specific brands or producers, but it generally falls within this range.