How Long Is the Human Intestine?

Human intestinal length varies among individuals and changes with age. Generally, the total length of the intestine is approximately 4 to 5 times an individual’s height. The intestine is divided into two main parts: the large intestine and the small intestine. The upper end of the small intestine connects to the stomach, while its lower end joins the large intestine; its typical total length ranges from 4 to 6 meters. The small intestine itself consists of three segments: the duodenum, jejunum, and ileum. The duodenum is approximately 25 cm long; the jejunum measures about 1.5–2.5 meters; and the ileum is approximately 2–4 meters in length.