Not sure about size, because mine didnt get full grown, but it was no bigger than 3'2", and i had mine for 4 yrs. They are a great beginner snake, and they normally don't bite, they will eat live mice at about the age of 4 months. They are nice beautiful snakes , and they are very tame, they need about a tank 20 gal. for a snake around 12 in., from there on you do the math, but don't buy this snake and cut him short. Snakes need full care and responsibility put towards them. I wouldnt buy a snake that you wont have the correct lighting, food, space, substrate for. They sell anywhere from $45-$90 (at about 9 in.).First I would buy a book, then buy all equipment that you need, and then buy the snake last. Good luck with your snake, and please write back if you have any questions.