What is the average girth?
The average erect girth (circumference) is 11.66 cm (4.59 in), per Veale et al. 2015. Most men fall between about 10 and 13 cm around.
Average erect girth — the circumference around the thickest part of the shaft — is 11.66 cm (4.59 inches). It comes from the same clinician-measured review as the length numbers (Veale et al., 2015). Flaccid girth averages 9.31 cm (3.66 in), and most erect measurements land between roughly 10.0 and 13.3 cm (3.9–5.2 in).
One quirk separates girth from length: its distribution is narrower. Because the data bunch tighter around the mean, a half-centimetre that would barely register on the length scale can shift your girth percentile noticeably. Small numbers carry more weight here.
It’s also the dimension that actually decides condom fit, so measuring it is practical, not just curiosity. Wrap a flexible tape around the thickest part of the erect shaft and read where it meets.
See girth vs length and the full statistics.