The average adult colon is about 5 to 6 feet (1.5 to 1.8 meters) long. That makes it significantly shorter than the small intestine, which stretches roughly 22 feet (7 meters), but the colon is much wider, averaging about 3 inches (8 cm) in diameter.
Length of Each Colon Segment
Your colon isn’t one uniform tube. It’s divided into distinct segments that loop around the edges of your abdomen, each with a different length and role in processing waste.
- Cecum: About 3 inches (8 cm) long. This pouch-like starting point connects to your small intestine and appendix.
- Ascending colon: About 8 inches (20 cm) long. It runs up the right side of your abdomen.
- Transverse colon: The longest segment at more than 18 inches (46 cm). It crosses horizontally from right to left beneath your stomach.
- Descending colon: About 6 inches (15 cm) long. It runs down your left side.
- Sigmoid colon: About 14 to 16 inches (35 to 40 cm) long. This S-shaped curve connects to the rectum.
The transverse colon alone accounts for roughly a third of the total length, which is why it has the most room to sag or shift position in the abdomen. The sigmoid colon is the second-longest segment and, because of its curved shape, is a common site for issues like diverticulitis and polyps found during colonoscopies.
Why Colon Length Varies Between People
Not everyone’s colon is the same length. Overall body size plays a role, and sex appears to matter as well. Research measuring sigmoid colons in adults found that men had a significantly longer sigmoid segment than women, averaging about 37 cm compared to roughly 33 cm. Male sigmoid colons ranged from about 28 to 47 cm, while female sigmoid colons ranged from 27 to 40 cm. These differences likely extend to other segments too, contributing to an overall longer colon in taller or larger-framed individuals.
How the Colon Compares to the Small Intestine
The naming is counterintuitive. Your “small” intestine is actually about three and a half times the length of your body, stretching around 22 feet. Your “large” intestine is only about 5 to 6 feet. The names refer to width, not length. The small intestine is narrow (about 1 inch in diameter) because its job is absorbing nutrients through a vast surface area of tiny folds. The colon is wider because it handles bulkier material, absorbing water and compacting what’s left into stool.
Together, the small and large intestines total roughly 27 to 28 feet of tubing packed into your abdomen.
What a “Redundant Colon” Means
Some people have a colon that’s longer than typical, with extra loops and twists. This is called a redundant or tortuous colon, and you might see the term on a colonoscopy report. It can be longer in just one segment or throughout the entire colon.
A redundant colon isn’t a disease. Doctors note it when they find it, mainly because the extra loops can make colonoscopies more technically challenging and sometimes cause the scope to take longer to navigate. Some people with a redundant colon experience bloating, constipation, or abdominal discomfort, but many have no symptoms at all and never know their colon is unusually long until an imaging study or procedure reveals it.
Width Along the Colon
The colon doesn’t stay the same width from start to finish. It’s widest at the cecum, where it matches the overall average of about 3 inches (8 cm) across. The ascending colon narrows slightly to about 2.5 inches (6 cm). By the time material reaches the sigmoid colon and rectum, the tube has narrowed further. This gradual taper helps compress stool as it moves toward elimination, which is also why blockages in the narrower left side of the colon tend to cause symptoms earlier than those on the wider right side.