Is 5.5 inches average?
No — 5.5 inches (13.97 cm) erect is above average: the 69.6th percentile, bigger than about 7 in 10 men. The clinician-measured average is 5.16 inches (13.12 cm).
Stop selling yourself short. 5.5 inches isn’t average — it’s above it. The clinician-measured average erect length is 5.16 inches (13.12 cm), pulled from the biggest study ever run on this (Veale et al. 2015, BJU International, n=15,521). A 5.5 inch penis (13.97 cm) lands at the 69.6th percentile — out ahead of roughly 7 in 10 men.
Here’s why that catches people off guard: the curve climbs steep right past the middle. Five inches is about the 40th percentile, just under the 5.2-inch (13.1 cm) median. Add half an inch and you vault to the 70th. Add another — 6 inches — and you hit the 90th, the top 1 in 10. At 6.5 inches you’re near the 98th. So 5.5 isn’t clinging to average. It’s planted firmly in the upper half.
Roughly 90% of men land between 4.1 and 6.2 inches (10.4–15.9 cm) erect. That puts 5.5 inches comfortably in the upper-middle of the normal range — and if you’re curious how rare your size really is, the numbers are on your side.
Nail the technique in our measurement guide, or get the full picture in our penis size statistics.