Standard Chinchilla rabbits may weigh as little as 5 pounds (2.3 kilograms) to as much as 13 pounds (5.9 kilograms) when they are fully grown. (You may be told at a rabbit show following American Rabbit Breeders Association standards that you cannot enter a Standard Chinchilla that weighs more than 7.5 pounds, or 3.4 kilograms.) A Giant Chinchilla rabbit will weigh between 12 and 16 pounds (5.5 to 7.5 kilograms) when it is mature. A very large Standard Chinchilla rabbit is about the same size as the smallest Giant Chinchilla rabbit. American Chinchilla rabbits typically weigh from 9 to 12 pounds (4.1 to 6.3 kilograms), in between the other two Chinchilla rabbit breeds.