According to a new review of studies conducted at King's College London revealed the average length of a flaccid penis, from base to the opening on the tip, was 3.6 inches. The circumference, measured around the base or mid-shaft, was 3.7 inches. When erect, the average penis size swells to 5.3 inches in length and 4.6 inches in circumference.
Researchers also looked into some of the most common "indicators" of penis size to see if there was any actual connection, and found a man's weight, length of his index finger, and foot size were not consistently predictive of his junk size. Height was found to be related to penis size, but only to a small extent. Study author Dr. David Veale adds that even if your penis is smaller than the average, it's "not an issue for 85 percent of women."