how long is small intestine

The small intestine in humans typically measures about 20 feet (around 6 meters) long. However, its length can vary significantly, generally ranging from 10 to 22 feet (3 to 7 meters) depending on factors such as height and measurement method. The small intestine is the longest section of the gastrointestinal tract, with an average diameter of about 2.5 to 3 centimeters (1 inch). It is divided into three parts: the duodenum (about 25 cm), jejunum (about 200 cm), and ileum (about 300 cm), which are coiled within the abdominal cavity.