4.5 inches — Percentile Ranking
Erect Length
Percentile15th
ClassificationBelow average
Z-score-1.02
vs. Mean-8.62 cm
Erect length distribution Distribution (cm)
Erect Girth
Percentile42th
ClassificationAverage
Z-score-0.21
vs. Mean-7.16 cm
Erect girth distribution Distribution (cm)
What This Means
A erect size of 4.5 inches places you below the population average. However, research consistently shows that penile size has minimal correlation with sexual satisfaction for either partner. This is based on the Veale et al. (2015) systematic review of 15,521 men.
How Common Is 4.5 inches?
Percentile15th
Men measuring shorter15%
Men measuring longer85%
About 15% of men have a erect length below 4.5 inches and 85% are above it — roughly 1 in 2 men measure longer. Distribution based on the Veale et al. (2015) systematic review of 15,521 men.