20 cm — Percentile Ranking
Erect Length
Percentile100th
ClassificationAbove average
Z-score4.14
vs. Mean6.88 cm
Erect length distribution Distribution (cm)
Erect Girth
Percentile100th
ClassificationAbove average
Z-score7.58
vs. Mean8.34 cm
Erect girth distribution Distribution (cm)
What This Means
A erect size of 20 cm places you above the population average. This is based on the Veale et al. (2015) systematic review of 15,521 men.