The small intestine is a convoluted tube, extending from the pylorus to the colic valve, where it ends in the large intestine and is 7 meters long and The large intestine extends from the end of the ileum to the anus. It is about 1.5 meters long http://www.bartleby.com/107/248.html
In adult humans, the small intestine is around 7m long, and about 3cm wide. The large intestine is about 1.5 metres long and around 6-10cm wide. The large intestine is called 'large' because it is wider than the small intestine, it is not longer.