What is the average penis size?
The average erect penis is 13.12 cm (5.16 in) long and 11.66 cm (4.59 in) in circumference, based on clinician-measured data from up to 15,521 men (Veale et al., 2015).
The average erect penis is 13.12 cm (5.16 inches) long and 11.66 cm (4.59 inches) around. That number is rock solid. It comes from Veale et al. (2015), a systematic review that pooled clinician-measured studies covering up to 15,521 men. The measurement method is the whole point: a professional with a ruler doesn’t round up the way a guy filling out a survey does. That’s why self-reported numbers always come in fat and inflated, and the clinical ones don’t.
Flaccid length averages 9.16 cm (3.6 in), and it tells you almost nothing about erect size. The two barely correlate, so stop reading the tea leaves at the gym. Stretched length is the real tell at 13.24 cm (5.21 in), tracking erect length closely. Spread the data out and roughly 90% of men land between 10.4 and 15.9 cm (4.1–6.2 in) erect. That’s a tight band. Most men sit within an inch of the mean, which means “average” covers a lot more ground than the internet pretends. Curious how rare your size really is? The math is friendlier than you think. Dig into the full statistics and the methodology for the receipts.