| | Conditions & Treatments | Digestive Health How long are your intestines? An adult has about 25 feet (7.6 meters) of small intestines. The large intestines are about 5 feet (1.5 meters) long. Together they are about 30 feet (9 meters) long. Digestive Health - Related Articles Home Remedies to Kill Parasites Definition of Gastroenteritis What Is Ischemic Bowel Disease? How to Control Belching Why does surgical removal of part the stomach decrease appetite? Social Security and Crohn's Disease Common Causes of Frequent Belching