Frequently asked questions

According to the Veale et al. (2015) systematic review, the largest of its kind, pooling 15,521 clinically measured men, the global average erect penis length is 13.12 cm and the average erect girth is 11.66 cm. Flaccid averages are 9.16 cm for length and 9.31 cm for girth.

The country figures are compiled from public aggregators (e.g. WorldData.info), not from a single controlled study. The underlying sources mix self-reported surveys with clinically measured studies, sample sizes vary enormously, and publication bias is likely. They are indicative estimates, not peer-reviewed per country, so treat every country comparison as approximate.

Your percentile is the cumulative distribution function of a normal distribution with the active baseline's mean and standard deviation, evaluated at your value. It is the share of men below you. The CDF uses the Abramowitz–Stegun error-function approximation (maximum error about 1.5 × 10⁻⁷), and displayed values use adaptive precision so the tails never show a literal 0% or 100%.

The tiers are six standard-deviation bands around the active baseline average, with their exact population shares: Small (below −2 SD, 2.28%); Below average (−2 to −1 SD, 13.59%); Average (−1 to +1 SD, 68.27%); Big (+1 to +2 SD, 13.59%); Large (+2 to +3 SD, 2.14%); Huge (above +3 SD, 0.13%).

No. MaleSizeIndex is an educational and informational visualization tool. It is not medical advice, and percentile statistics say nothing about health. If you have concerns about your body or sexual health, consult a qualified healthcare professional.