It’s a subject many men have wondered about at some point in time: What is the average penis size?
According to one study published in the British Journal of Urology International (BJUI), the average length of a flaccid penis is 3.61 inches, while the average length of an erect penis is 5.16 inches.
The average girth is 3.66 inches for a flaccid penis and 4.59 inches for an erect penis. Girth is the circumference of the penis at its widest section.
Keep reading to learn more about penis size, how much size matters for sexual satisfaction, and what you should do if you’re worried that your penis is too small.
The BJUI research used data from 17 studies, and the study participants totaled more than 15,000 men. In addition to the averages listed previously, the analysis charted sizes and placed them into percentiles.
For example, an erect penis of 6.3 inches is in the 95th percentile. That means that out of 100 men, only five would have a penis longer than 6.3 inches.
Likewise, an erect penis of 3.94 inches is in the 5th percentile, meaning that only five men out of 100 would have a penis shorter than 3.94 inches.
Other studies have produced similar results. A study published in the Journal of Urology also found that the length of a penis when flaccid wasn’t a predictor of its length when erect. In other words, men can have erections of similar size, but have flaccid penises of varying size.
How to measure your penis size
Measure length from the top of your penis to the tip of your glans.
The top of your penis is where it connects to your pubic bone. The tip of your glans is the round part at the end of your penis. Compress any fat in front of your pubic bone when measuring. Also, don’t include additional length related to a foreskin.
Measure girth around the base or the middle of the shaft.