There is no one “average” size for sunglasses frames as everyone’s face shape and size is unique. However, generally, adult sunglasses range in size from 49mm to 62mm in lens width, with the bridge width typically being between 16mm to 24mm, and temple length ranging from 135mm to 150mm. SunglassHut.com provides a fit chart that categorizes frames as small, standard, or large based on lens width.