What percentage of men have a 6-inch penis?
About 10% of men have an erect penis of 6 inches or longer — a 6-inch (15.2 cm) erection sits at roughly the 90th percentile, well above average and found in only about 1 in 10 men.
About 10% of men have an erect penis of 6 inches (15.2 cm) or longer. That puts 6 inches at the 90th percentile — bigger than roughly 9 in 10 men, and nearly an inch past the average of 13.12 cm (5.16 in) from Veale et al. (2015, BJU International), the largest clinician-measured study on record (n=15,521, median 13.1 cm).
The curve climbs fast right around there. Five inches sits just under average at about the 40th percentile. Five and a half hits the 70th. Six lands at the 90th. Push to 6.5 and you’re at the 98th (1 in 50); 7 inches is the 99.7th — about 1 in 400. So 6 inches sits at the top edge of the common range — roughly 90% of men measure between 4.1 and 6.2 inches (10.4–15.9 cm) — without tipping into genuinely rare.
See the full breakdown in our penis size statistics, or read is 5 inches normal? for context on the average range.