The size of a tortoise varies by species, with some species being relatively small and others growing to a considerable size. For example, the smallest tortoise species, the speckled padloper tortoise, grows to only about 3-4 inches (8-10 cm) in length. On the other hand, the largest tortoise species, the Galapagos tortoise, can grow up to 4 feet (1.2 meters) in length and weigh over 500 pounds (225 kg). The size of a tortoise is influenced by factors such as genetics, diet, and habitat.