Adult house centipedes have 15 pairs of legs with the last pair (on adult females) nearly twice the length of the body, which is one to one and one-half inches in length. This gives the centipede an overall appearance of being from three to four inches in length (including legs and antennae). The legs are banded light and dark, and the body is a dirty yellow with three longitudinal, dark stripes.

Source: PennState Extension