Where does your length rank in the clinical data?
Enter your erect length and see exactly where you rank against Veale et al. (2015) — 15,521 men, clinician-measured, no self-reported data included.
Result
Context
Curious about performance, not just size?
Men's health clinics offer confidential consultations on confidence and stamina.
What is the average erect penis length?
The most rigorous study on this question is Veale et al. (2015), published in BJU International. Researchers reviewed 20 studies and produced data from 15,521 men, accepting only clinician-measured results — excluding every self-reported data point. Their finding on erect length: the mean is 13.12 cm (5.17 in), with a standard deviation of 1.66 cm.
68% of men fall within one standard deviation of the mean — roughly 11.46–14.78 cm (4.51–5.82 in). True extremes in either direction are statistically rare: fewer than 2.5% of men fall below the 2nd percentile or above the 97th.
Why clinician-measured data matters
Self-reported studies consistently produce higher averages — typically 1.25 to 2 inches more than clinician-measured equivalents. When men measure themselves, cognitive bias, measurement technique, and social desirability all skew the results upward. Veale et al. specifically excluded self-reported data, which is why this study is the most cited in clinical urology and sex research.
Many popular online "average size" figures come from self-reported surveys and are meaningfully inflated. The 5.17-inch mean from Veale et al. is the most reliable clinical benchmark available.
What does the length distribution actually look like?
Length follows a normal (bell curve) distribution. The closer a measurement is to the mean, the more men share a similar measurement. Key percentile points from Veale et al.: the 25th percentile is 12.00 cm (4.72 in), the 50th is 13.12 cm (5.17 in), and the 75th is 14.24 cm (5.61 in). The range between the 25th and 75th percentiles — the middle half of all men — spans just 2.24 cm (0.88 in).
Does length vary by country?
Individual variation within any country vastly exceeds variation between countries. The clinician-measured range within a single population is approximately 7 cm. By contrast, WHO regional data shows a spread of only about 3.6 cm between the highest- and lowest-average world regions. Country-level rankings widely circulated online mix clinician and self-reported data without distinguishing between the two — researchers have specifically described extreme country claims as "selective at best."
Frequently asked questions
Yes. A 5-inch erect length sits just below the 50th percentile in the Veale et al. data. The 45th percentile is approximately 5.1 inches. Half of all men measured fall between 4.72 inches (25th percentile) and 5.61 inches (75th percentile) — a range of less than one inch covers the entire middle 50% of the population.
Most online averages draw from self-reported surveys. When men measure themselves, the results skew consistently higher than clinician-measured equivalents — by 1.25 to 2 inches on average. The 5.17-inch clinical average is not an outlier — it's the result of removing the self-reporting bias present in other datasets.
The Veale et al. study did not find clinically significant variation by ethnicity after controlling for measurement methodology. On age: there is modest variation, with size peaking in early adulthood and slightly decreasing with age due to vascular changes — but individual variation is far greater than any group-level pattern.
- Veale D et al. (2015). BJU International, 115(6), 978–986
- Wylie KR & Eardley I. (2007). BJU International, 99(6), 1449–1455
- WHO Regional Office data (aggregated)