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) erect length sits at roughly the 90th percentile, so it's 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 roughly the 90th percentile — larger than around 9 in 10 men, and nearly an inch past the average of 13.12 cm (5.16 in) reported by Veale et al. (2015, BJU International), the largest clinician-measured study (n=15,521, median 13.1 cm).
To see how quickly the curve climbs near that point: 5 inches sits just below average at about the 40th percentile, 5.5 inches reaches the 70th, and 6 inches is the 90th. Push to 6.5 and you’re at the 98th (1 in 50); 7 inches is the 99.7th (1 in 400). So 6 inches caps off the common range — about 90% of men fall between 4.1 and 6.2 inches (10.4–15.9 cm) — without crossing into rare.
See the full breakdown in our penis size statistics, or read is 5 inches normal? for context on the average range.