How big is Rhode Island red?

The Rhode Island Red is a medium to large breed, commonly weighing 6.5-9 pounds (2.9-4 kg) for hens, and 8.5-11.5 pounds (3.9-5.2 kg) for roosters.

Body measurements from the American Standard of Perfection are: Male head length about 3 3/4", Female head length about 3 3/4" ; Cockerel body length about 24", Pullet body length about 21"; Cockerel tail length about 14 1/2", Pullet tail length about 13"; Cock weight 8 1/2 to 9 1/2 lbs., Hen weight 6 1/2 to 7 1/2 lbs.