Anxiety about sexual performance can lead to erectile dysfunction and premature ejaculation. Many men may feel anxious about how their penis and erection size may sexually satisfy themselves and their partners. Self-reported data tend to be inflated, leading many men to feel inferior, resulting in decreased self-confidence. Measurement errors and relying on self-reported data have led to a lot of misinformation on the internet on the average penis and erection size. In contrast, an average is a single number with half of men above and half below this marker.Īn average depends on what population is chosen, how accurate the measurements are and how many men are surveyed. A wide range of penis and erections sizes are normal. However, normal and average are very different. A study in the BJUI found that the average flaccid penis length is 9.16 cm while the average erect penis length is 13.24 cm.ĭeep down, everyone wants reassurance that they are normal. Most men, at some point, have wondered or even asked, 'What is the average penis and erection size?' You may have also asked this question.