It depends alot on the type of carpet python as there a a few different breeds.
Jungle carpet pythons(morelia spilota cheynei) will grow to anywhere between 14-18 feet in length.
Coastal Carpet...
Depends on the species. The (Asiatic) Reticulated Python (Python reticulatus) is a member of the Pythonidae family and has and average length of 15 ft. (4.57 m) to 25 ft. (7.62 m) however, it is...