The weight of an average chicken varies depending on the breed. According to Farm Animal Shelters, female layer chickens tend to weigh between 5 to 13 pounds.
Other chickens such as Leghorns weigh significantly less than typical female layers. Leghorns usually weight around 3 to 6 pounds. Roosters typically weigh between 10 and 18 pounds. Chickens used specifically for laying eggs weigh less than chickens bred for meat. However, the weight of a chicken depends on other factors, as well. The type of diet, environmental factors and overall health all play a role in how much a mature chicken weighs.