The human small intestine is over 20 feet long, while the large intestine is about 5 feet long.
Notes on verification
Confirmed by multiple independent medical sources (Cleveland Clinic, NCBI/StatPearls, Children's Hospital of Pittsburgh) with consistent figures around 20-22 feet for the small intestine and ~5 feet for the large intestine.
Sources
- Fascinating Facts About Your Body - WebMD (webmd.com)
- https://www.ncbi.nlm.nih.gov/books/NBK532263/ (ncbi.nlm.nih.gov)
- https://www.chp.edu/our-services/transplant/intestine/education/about-small-large-intestines (chp.edu)
- https://my.clevelandclinic.org/health/body/22135-small-intestine (my.clevelandclinic.org)