How does your size compare to clinician-measured data?
Nearly every "average" you've seen online came from men measuring themselves, and men measuring themselves add an inch or two. This calculator doesn't use any of that. It runs on the one large review where a clinician held the tape, up to 15,521 men across 17 studies, so the percentile you get is against real measurements rather than what people were willing to say. This calculator on Find The Norm uses Veale et al. (2015) BJU International clinician-measured data (up to 15,521 men) to rank your measurement against the clinical population.
Querying population data…
Original calculator
Same Veale dataset, with cm/inches toggle and country variants.
What is the average penis size?
The average erect length is 13.12 cm (5.17 inches), with a standard deviation of 1.66 cm, and the average erect girth is 11.66 cm (4.59 inches). Those numbers come from Veale and colleagues' 2015 review in BJU International, which pooled 17 studies covering up to 15,521 men and threw out every measurement a man had taken himself, though its erect figures rest on 692 men for length and 381 for girth, fewer than people assume. It's the only dataset of that size where every figure was recorded by a clinician, and it's the one this calculator uses.
The same review gives a mean flaccid length of 9.16 cm (3.61 inches) and flaccid girth of 9.31 cm (3.66 inches), alongside the erect means of 13.12 cm (5.17 inches) and 11.66 cm (4.59 inches). With a standard deviation of about 1.66 cm, 95% of men measure somewhere between roughly 9.9 cm (3.9 inches) and 16.4 cm (6.5 inches) erect. The distribution is close to a bell curve, so the middle is crowded and the ends are thin: 6 inches sits at about the 90th percentile, and 4 inches at about the 4th. If either of those surprises you, it's because the reference points most men carry around were set by numbers that were never measured by anyone else.
Why clinician-measured data matters
Because men measuring themselves report averages 1.25 to 2 inches (3 to 5 cm) higher than clinicians record for comparable groups, and that gap shows up in study after study. Whenever an online "average" looks bigger than the clinical figure, it's almost always because self-reported samples are in the mix. This calculator uses none of them.
Two things inflate the self-reported numbers, and neither is lying exactly. The first is who turns up: men who think they're above average are more likely to fill in a size survey, so the sample tilts before anyone picks up a ruler. Then there's technique. A clinic protocol fixes where you start measuring, how much you press into the pubic fat pad and how the man is positioned, and without those rules people drift towards the more flattering reading by a centimetre or two. Veale's team excluded every self-measured study for exactly these reasons. Add pornography, whose performers are cast partly for being unusual, and you get a population that believes the average sits well above where it does, what the researchers call a normative misperception. Wylie and Eardley's 2007 review describes the worry about being small as often unfounded and within the normal experience of many men.
What does the distribution actually look like?
A bell curve with a narrow middle. About 68% of men fall within one standard deviation of the mean, so erect lengths between roughly 11.46 and 14.78 cm (4.51 to 5.82 inches) cover two men in three. Genuine extremes in either direction are rare, and nothing this calculator can show you carries any medical meaning on its own.
Run the Veale figures through the normal curve and the landmarks fall like this. An erect length of 5 inches (12.7 cm) is about the 40th percentile, 5.5 inches (14 cm) the 70th, 6 inches (15.24 cm) the 90th and 7 inches (17.78 cm) above the 99th. Girth behaves the same way: 4.5 inches (11.4 cm) sits near the mean at about the 42nd percentile, and 5 inches (12.7 cm) is up at the 83rd. Notice how far the cultural markers sit from the statistical ones. Six inches, which gets talked about as "a bit above average", is in the top 10% of men who've actually been measured. Knowing that doesn't change what's normal, because everything in the typical range is ordinary biological variation, but it does move the average back to where it belongs.
Frequently asked questions
Yes. Five inches (12.7 cm) erect sits just under the median of 5.17 inches (13.12 cm), at roughly the 40th percentile, which is about as close to the middle of the distribution as a round number gets. More men measure within half an inch of you than anywhere else on the curve.
Because almost all of them include men who measured themselves, and that adds 1.25 to 2 inches on average. Veale and colleagues dropped every self-reported study for that reason. Measured by a clinician, the median is 5.17 inches, and the higher figures you'll see quoted were never checked by anyone.
Far less than the maps suggest. The differences between two men in the same country dwarf any difference between countries, and the country rankings that circulate online mix clinical and self-reported data, which makes them close to worthless for comparison. No clinician-measured source this page relies on ranks countries, and the overlap between any two populations is enormous.
Bigger than most men think it is. Six inches (15.24 cm) erect is roughly the 90th percentile in the Veale et al. 2015 data, whose erect length figure comes from 692 men, so about nine men in ten measure shorter. It gets described online as "a little above average" because the online average was set by self-reported surveys and pornography, both of which run high. Against a mean of 13.12 cm (5.17 inches) and a standard deviation of about 1.66 cm, six inches is more than a full standard deviation above the middle, and 7 inches is out above the 99th percentile.
Along the top, from the pubic bone to the tip, with the ruler pressed into the fat pad so that body weight doesn't shorten the reading, and with girth taken at the midpoint or the widest part of the shaft. The studies Veale's team included all used a written protocol along those lines and a clinician doing the measuring. That matters because the self-measured surveys have no such rules, and the freedom to choose where to start and how hard to press is worth about 1 to 2 cm on average. If you want your own reading to be comparable with the clinical mean of 13.12 cm (5.17 inches), measure the same way.
Because they're built almost entirely from self-reported surveys, and the amount men exaggerate probably differs from culture to culture, so the maps measure bragging habits as much as anatomy. The clinician-measured studies that do compare countries find much smaller gaps than the maps show, and Veale's review pooled studies from several countries but didn't set out to compare them, so it can't settle the question either way. What it does show is how wide the spread is inside the measured samples.
A clinical term with a clinical threshold, not a judgement. In adults it usually means an erect length of 7 cm (about 2.75 inches) or less, or a stretched flaccid length of 9.3 cm or less, with the exact cut-off varying a little between textbooks. It's rare, and it's almost always down to hormone exposure during development in the womb rather than anything genetic or structural, and it's diagnosed and managed by urologists and endocrinologists. This calculator doesn't diagnose anything. A measurement under that threshold would show as below the 1st percentile here, and what to do about it is a conversation for a clinician, not a percentile.
- Veale D, Miles S, Bramley S, Muir G, Hodsoll J. Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference. BJU International. 2015;115(6):978-986.
- Wylie KR, Eardley I. Penile size and the small penis syndrome. BJU International. 2007;99(6):1449-1455.