Is 16 cm big?
Yes — 16 cm (6.3 in) erect lands at the 96th percentile in clinician-measured data (Veale 2015), with only about 1 in 24 men, the top 4%, measuring larger.
Statistically, yes. 16 cm (6.3 in) erect sits at the 96th percentile — top 4%, with about 1 in 24 men measuring larger.
The benchmark is the clinician-measured mean of 13.12 cm (Veale et al. 2015, n up to 15,521). Sixteen centimeters exceeds it by nearly 3 cm, or 1.7 standard deviations. Since roughly 90% of men fall between 10.4 and 15.9 cm erect, 16 cm lands just past the upper edge of that band. For reference, 13 cm is the average; 16 cm belongs to a different bracket.
Percentiles compress rapidly at this range. Moving from 15 to 16 cm raises a man from the 87th percentile to the 96th; near the middle of the curve, that same centimeter would barely register. Past 16 cm, each additional centimeter shrinks the group ahead of you several-fold.
The full distribution is tabulated in the penis size chart, with methodology and sources in the size statistics.