Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15,521 men

BJU Int. 2015 Jun;115(6):978-86. doi: 10.1111/bju.13010. Epub 2015 Mar 2.


Objective: To systematically review and create nomograms of flaccid and erect penile size measurements.

Methods: Study key eligibility criteria: measurement of penis size by a health professional using a standard procedure; a minimum of 50 participants per sample.

Exclusion criteria: samples with a congenital or acquired penile abnormality, previous surgery, complaint of small penis size or erectile dysfunction. Synthesis methods: calculation of a weighted mean and pooled standard deviation (SD) and simulation of 20,000 observations from the normal distribution to generate nomograms of penis size.

Results: Nomograms for flaccid pendulous [n = 10,704, mean (SD) 9.16 (1.57) cm] and stretched length [n = 14,160, mean (SD) 13.24 (1.89) cm], erect length [n = 692, mean (SD) 13.12 (1.66) cm], flaccid circumference [n = 9407, mean (SD) 9.31 (0.90) cm], and erect circumference [n = 381, mean (SD) 11.66 (1.10) cm] were constructed. Consistent and strongest significant correlation was between flaccid stretched or erect length and height, which ranged from r = 0.2 to 0.6.

Limitations: relatively few erect measurements were conducted in a clinical setting and the greatest variability between studies was seen with flaccid stretched length.

Conclusions: Penis size nomograms may be useful in clinical and therapeutic settings to counsel men and for academic research.

Keywords: circumference; girth; length; nomogram; penis; systematic review.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review
  • Systematic Review

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Anthropometry
  • Humans
  • Male
  • Middle Aged
  • Nomograms
  • Organ Size / physiology
  • Penile Erection / physiology*
  • Penis / anatomy & histology*
  • Reference Values
  • Young Adult