It has been seen that the flaccid (non-erect) length average from 2.8 to 3.9 inches. Flaccid circumference/girth average from 3.5 to 3.9 inches. Erect (fully hard) length average from 4.7 to 6.3 inches. Erect circumference is around 4.7 inches.
Men are always conscious about their penis length and thickness. Many men feel that their penis is not up to the mark for an enjoyable and satisfactory sexual act. They usually get this idea from porn sites or images. They realize that the act in the porn film is real and anything less than this would lead trouble to them in near future.
But definitely there are some abnormalities in some people’s body that might lead to small (and sometimes non-functional) penis and that should be checked by the doctor.