Myths about size

The biggest size claims and the most repeated size myths, checked against what was actually measured. Some hold up, some are exaggerated, and one "world record" turned out to be mostly skin.

Units

Every claim on one ruler

The blue curve is where real men fall, based on clinical measurements. Pick any marker to see what it is, how well it's backed up, and how rare it would be.

Green markers were measured, blue are bell-curve estimates, yellow are unverified claims and red was disproved. Rarity figures assume a bell curve, which is only a rough guide this far from average.

The claims, drawn to scale

All shapes share one scale, so the differences are real. Dashed outlines are unverified claims. Where no girth was reported, the shape is drawn at the average girth.

What clinicians actually measured

Most papers only report averages, but a few publish the shortest and longest man they measured. Here they are, with a self-measured study for contrast.

The two clinical studies measured the penis stretched while soft, which is quicker and avoids inducing an erection. In a study that measured the same men both ways, stretched length underestimated erect length by about 20% on average.

When researchers hold the ruler

A 2021 review compared studies where researchers measured erect penises with studies where men reported their own size.

The self-reported figure is higher for two reasons: men who are proud of their size are more likely to volunteer, and people round up. The review's authors concluded the true average is probably 5.1 to 5.5 inches, towards the lower end.

Myths, rated

Open any card to see the evidence behind the verdict.

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Why records are so hard to pin down

No official record exists

Guinness World Records doesn't track penis size, so every "world's biggest" title is self-declared or awarded by the media.

Papers rarely report the extremes

Clinical studies publish averages and spreads. The largest individual measurement usually sits in a table, if it's published at all.

Method changes the number

Pressing the ruler to the pubic bone, measuring along the underside, or counting the foreskin can each change the result by centimetres.

Fame rewards exaggeration

The best-known claims come with documentaries, books or websites. That doesn't make them false, but it's a reason to want published, independent measurements.

Sources

  1. Our average of 11 clinic-measured, bone-pressed erect studies, pooled from figures compiled by calcSD. Details on the Sources page.
  2. Veale D, et al. Am I normal? Nomograms for penis length and circumference in up to 15,521 men. BJU International, 2015.
  3. Aslan Y, et al. Penile length of healthy young men according to geographical regions of Turkey: 1,132 cases. Turkish Journal of Urology, 2010.
  4. Reference range of penile length in healthy men in Baghdad (223 men). Arab Journal of Urology, 2017.
  5. Herbenick D, et al. Erect penile length and circumference dimensions of 1,661 sexually active men in the United States. Journal of Sexual Medicine, 2014.
  6. King BM. Average-size erect penis: fiction, fact, and the need for counseling. Journal of Sex and Marital Therapy, 2021.
  7. Habous M, et al. Outcomes of variation in technique and variation in accuracy of measurement in penile length measurement. International Journal of Impotence Research, 2018.
  8. Reporting on Roberto Esquivel Cabrera's CT scan by radiologist Dr Jesus Pablo Gil Muro (IBTimes, 2018), and on the claims of Jonah Falcon and Matt Barr.
  9. Shah J, Christopher N. Can shoe size predict penile length? BJU International, 2002.
  10. Wessells H, et al. Penile length in the flaccid and erect states. Journal of Urology, 1996.
  11. Belladelli F, et al. Worldwide temporal trends in penile length. World Journal of Men's Health, 2023.
  12. Prause N, et al. Women's preferences for penis size. PLOS ONE, 2015.

Definitions of the terms used here, and details of every study, are on the Sources page.