What is average weight of human feces?

None you idiot. Feces are in the bowels.

I think whoever left this answer above should go back to school and learn something.

The intestines have two distinct parts, the small and large intestine. The Small Intestine does not have Feces, but Chyme, a partially digested mixture of food and gastric juices. The Large Intestine, can also be called the Large Colon or Large Bowel, does contain Feces. However, that the beginning of the L. Intestine it is of a more watery consistency and at the end near the rectum the feces is more formed.

So, in order to answer your question. It really all depends on how often you have bowel movements. If you have a bowel movement every other day you can expect to have anywhere to 2lbs - 8 lbs of feces. But if you don't have a bowel movement for 4-5 days then it can increase upwards to 15-20 lbs.

Dr.Tony MD

Emergency Medicine.