The penis has been dubbed "the barometer of a man's health", and rightly so, as any abnormality in its anatomy, physiology, or functioning may reflect an underlying disease or disorder. Furthermore, the penis is considered to be the symbol of virility, power, manhood, strength, and authority. This explains the obsession of many men with the size of their penises. In an Internet-based survey of 52031 heterosexual men, 66% rated their penises as average, 22% as large, and 12% as small.
No so-called normal penis size can be universally applied. Penile dimensions differ according to heredity, race, amount of suprapubic fat, age, and serum testosterone level, and even vary from one country to another. The medical literature reports that the average length of the healthy adult penis in the United States is 3.5 inches (8.8 cm) when flaccid, about 4.9 inches (12.4 cm) when stretched, and 5.1 inches (12.9 cm) when erect; the average flaccid girth is 3.7 inches (9.4 cm).
In general, and despite some minor international variations, the normal measurements of the penis are 3.6 - 4 inches for the flaccid penis, 4.6 - 5.2 inches for the stretched penis, and 5.6 - 6.4 inches for the erect penis, with a girth of 3.6 - 4 inches for the flaccid penis and 4.6 - 6 inches for the erect penis. While the penis is flaccid, the best way to estimate its erect length is to pull back the fat pad that may be covering it, stretch the penis, and measure it from the lower edge of the pubic bone to the tip of the glans. And before you ask, there is no correlation between the size of the penis and the size of the nose, foot, fingers, or any other body part.