Is 5.5 inches average?
Yes. At 5.5 inches (14 cm) erect, you're above average — around the 70th percentile, longer than roughly 7 in 10 men. The clinician-measured average erect length is 5.16 inches (13.12 cm).
It’s above average — people just expect the average to be higher than it is. The clinician-measured average erect length is 5.16 inches (13.12 cm), from the largest study on record (Veale et al. 2015, BJU International, n=15,521). At 5.5 inches you’re around the 70th percentile, ahead of roughly 7 in 10 men.
The reason that surprises people is the shape of the curve: the climb steepens fast just past the middle. Five inches is about the 40th percentile, sitting a touch below the 5.2-inch (13.1 cm) median. Add half an inch and you jump to the 70th. Another half inch — 6 inches — reaches the 90th, the top 1 in 10, and 6.5 inches is roughly the 98th. So 5.5 inches isn’t borderline-average; it’s solidly into the upper half.
About 90% of men measure between 4.1 and 6.2 inches (10.4–15.9 cm) erect, which puts 5.5 inches comfortably in the upper-middle of the normal range.
Learn the right technique in our measurement guide, or see the full breakdown in our penis size statistics.