how long is the small intestine

The small intestine in an adult human is typically about 3–5 meters long, which is roughly 10–16 feet when measured in a living person.

Quick Scoop

• In most adults, the small intestine is around 10–16 feet long.

• Across different people, it can range from about 9 feet up to more than 30 feet depending on how and when it’s measured (in the body vs. after death, stretched vs. relaxed).

• It is much longer than the large intestine (which is about 5 feet), even though it’s called “small” because its diameter is narrower.

A bit more detail (mini breakdown)

• Average in adults: Most medical references put the average length at about 3–5 meters (10–16 feet).

• Possible range: Some studies and reviews report a broader range, roughly 3–10.5 meters (10–34 feet), depending on the person and measurement method.

• Sections and their lengths (approximate):
  • Duodenum: about 8–10 inches long.

* Jejunum: around 8 feet.

* Ileum: close to 10 feet and the longest part.

So, if you just need a quick, practical answer for “how long is the small intestine?”, you can safely say: about 3–5 meters (10–16 feet) in adults.

Information gathered from public forums or data available on the internet and portrayed here.