What is the most common penis size?
The most common (average) erect penis size is about 13.1 cm (5.2 inches) in length and 11.7 cm (4.6 inches) in girth, based on clinician measurements of over 15,000 men.
The single most common erect size is right around the median: about 13.1 cm (5.2 inches) in length and 11.7 cm (4.6 inches) in girth. That comes from Veale et al. (2015, BJU International), the largest clinician-measured study to date, pooling 15,521 men.
“Most common” is a real claim here because the distribution peaks sharply at the middle rather than spreading out. Walking up the percentiles shows how packed the center is:
- 5th percentile: 10.4 cm (4.1 in)
- 25th percentile: 12.0 cm (4.7 in)
- 50th / median: 13.1 cm (5.2 in)
- 75th percentile: 14.2 cm (5.6 in)
- 95th percentile: 15.9 cm (6.2 in)
Half of all men fall inside a span of just 2.2 cm — from 12.0 to 14.2 cm. Put in inches, 5 inches sits near the 40th percentile, 5.5 around the 70th, and 6 at roughly the 90th, so “common” and “average” collapse into the same answer.
The preference angle is worth a sentence because people assume the common size is somehow the unwanted one. It isn’t: when partner-preference studies land on an “ideal,” it sits barely above this average, and girth tends to weigh as much as length — meaning the median measurement is, by the numbers, close to what’s actually preferred.
If you’d like to see exactly where a measurement falls, see the full penis size statistics or read is 5 inches normal?.