Rat snakes typically range in size from about 4 to 6 feet (1.2 to 1.8 meters) long, which is the most common length for many species

. Some species can grow larger, reaching lengths of 7 feet (2 meters) or more, with certain types like the gray rat snake growing up to 7 feet and the eastern rat snake commonly ranging from 3.5 to 7 feet

. In exceptional cases, some rat snakes can grow even bigger. The largest recorded rat snake was a keeled rat snake measuring 13 feet 1 inch in length, though this is rare

. Generally, large rat snakes can reach lengths of 7 to 9 feet, with some varieties capable of nearly 10 feet

. In summary:

• Common adult size: 4 to 6 feet (1.2 to 1.8 m)
• Larger species: up to 7 feet (2 m) or slightly more
• Record largest: 13 feet 1 inch (keeled rat snake)

They are muscular constrictors and can weigh from 1.5 to 6 pounds, with some large individuals possibly weighing close to 10 pounds