Crocodile turtles can grow about 5-10 centimeters a year, and their growth rates are different at different ages. When the crocodile turtle was born in the first year, its growth rate was the fastest, which could grow about 10 cm a year. Some of the better feeding techniques could grow 15 cm a year. In the second year, their growth rate will slow down, and they will grow about 5-7 cm a year. This growth rate will last for 4-5 years, and in about 5 years, they will mature. As adults, the growth rate of crocodile turtles will slow down, and they can only grow by 2 cm a year. Some people with poor physique will stop growing.

The body length of artificially raised crocodile turtles is between 40-70 cm in adulthood, and how big they can grow depends on the environment and way of raising them. If the breeding space is larger, their body size will develop larger. If there is not enough room for breeding, and crocodile turtles are not in good health, they will not be too big.

The wild crocodile turtles are generally larger than those raised in captivity, and most of them can grow to 70 cm. It is also recorded that the largest crocodile turtle is 100 cm long and weighs 200 kg, making it the largest crocodile turtle.