We’ve all heard the stories and tall tales about how to predict a mans penis size.

Undoubtedly, you’ve had one or more conversations with female friends who claim they’ve developed a patented system for picking out who’s packing and who’s lacking. 

They might mention a quick glance at a man’s hands, a quick measurement of their shoe size, or they might have a different approach all their own.

However, how do you separate the BS when it comes to predicting penis size? 

As it turns out, science has a lot to say about these old wives’ tales, and not all of it is complimentary. 

In the following article, we’ll discuss the truth about predicting a man’s penis size based on a number of factors. 

Using articles and references from actual doctors, researchers, and studies, we’ll attempt to set the record straight on sizing up the average stud.  

Does Shoe Size Predict Penis Size?

It’s an oldie and a goodie, and both men and women tend to swear by it. 

I’m talking, of course, about the correlation between a man’s foot size and the size of his penis. 

According to its proponents, a penis is just like any other “appendage.” If a man is blessed with big feet, he’s more likely to be packing in his pants. 

Urologists, who are usually the bellwether for studies involving penis length, have done quite a bit of research on this topic. 

The main supposition for the idea is that since penis size has a genetic component, and so do the size of a man’s feet, a correlation must exist. 

Though there is certainly a type of logic to this idea, studies have repeatedly failed to find any relationship between shoe size and penis size.

So while those mile-high basketball players might seem intimidating, they’re just as likely to be average as any other man. 

Does Height Predict Penis Size?

Here again, we have a presupposition that seems to make logical sense. 

After all, when men are tall, they tend to have larger hands, larger feet, longer arms, and longer legs. 

With this idea in our minds, it’s easy to make assumptions about proportion. 

As with the feet theory, this is largely supported by anecdotal evidence and what we tend to call “old wives’ tales.” 

However, despite a number of studies, no significant correlation has ever been found between a man’s height and his penis size. 

That said, tall men commonly benefit from the mere assumption that their penises might be bigger. 

They tend to get more attention from women and are often considered more attractive than their shorter counterparts. 

This is a whole other topic, but it is extremely interesting. You can read more about it here.

Index Finger Length and Penis Size

Now, even a broken clock is right twice a day. 

By this, I mean that even the most outrageous old wives’ tale or urban legend will have some basis in fact. 

That said, without scientific evidence performed by medical professionals or researchers, rumors of such correlations can only remain just that. 

Enter the index finger test… 

As it turns out, rather than looking at a man’s feet or measuring his height, curious minds needed to only give him a firm handshake to get a good idea of what he’s packing down below. 

According to a study published in the Asian Journal of Andrology, the so-called “digit ratio” is actually the most accurate visual predictor of a man’s penile length. 

The basic idea of this research focuses on the ratio between the length of a man’s index finger and ring finger. 

Lower rations, or the shorter the length of the index when compared to the ring finger, tended to result in a longer penile length.

Though researchers are still parsing out the particulars, it appears that the length of these fingers is one of many markers for prenatal androgen or testosterone exposure. 

As we all know, testosterone has a lot to do with what makes men, well, men. 

However, is there a correlation between testosterone and men with more than the average package? 

Answering this question will require a much closer look… 

Do Testosterone Levels Predict Penis Size?

With the introduction of the Y chromosome, a developing fetus turns from a female into a male. 

During this time and up until their birth, the now-male fetus is exposed to an elevated amount of testosterone in order to facilitate development. 

Of course, how much depends on a number of factors affecting both the mother and the fetus itself. 

However, it is clear that this exposure to testosterone has a direct impact on the fetus’s development – impacts that last past birth and well into childhood and adolescence. 

Though many such impacts are quite small, some are a bit more significant (as we’ll see). 

According to one study in the European Journal of Endocrinology, testosterone levels during the fetal stage directly correlate with penile size up until puberty. 

This was evident not only in the size of the child’s member, but also in its rate of growth and development as the child grew older and entered his pubescent years. 

While interesting, to say the least, there is one big “however” that needs to be considered. 

We’re making reference to the fact that the same study concluded that prenatal testosterone levels had a minimal correlation with penis size after puberty

This means that, as far as a man’s post-pubescent penis size is considered, that initial shot of testosterone has long since worn off. 

This indicates that an adult male’s penis size is heavily reliant on their testicles’ ability to produce testosterone during their adolescent development. 

This is further evidenced by the fact that adult males who seek to grow their penises via testosterone replacement therapy often see little to no result. 

This is because their testes have already done what they were pre-programmed to do. 

In fact, it’s been evidenced that men who do see “results” and claim to have gained size are actually just reversing atrophy and returning back to their baseline length. 

But wait, there’s more…

The above evidence only applies to men who have been exposed to an average amount of testosterone, not those who suffer from hormone-related issues such as: 

  • Lack of facial hair
  • Lack of armpit, body, or pubic hair
  • Severely atrophied testicles
  • A micro-penis
  • Testosterone levels under 100ng/dl

When dealing with situations such as these, testosterone injections have actually proven extremely effective. 

Take the case of a 34-year-old Pakistani man. Despite his age, he suffered from a two-inch micro-penis and extremely sparse body and facial hair. 

This put him well under the average global penis size and indicated extremely low testosterone levels. 

However, endocrinologists were able diagnose the man with idiopathic hypogonadotropic hypogonadism — a condition in which the testicles don’t produce enough hormones. 

After seeking testosterone replacement treatment, the man saw his testicles double in circumference while his penis grew to a length of around 5.2 inches – the mean size for adults his age.  


In the end, the only penis size predictors that carry any sort of reliability are finger length ratios, prenatal testosterone exposure, and testosterone exposure just before puberty. 

As you might notice, only one of these provides you with any sort of “visual marker” for predicting the size of a man’s penis. 

So, unless women care enough to start bringing needles, vials, and a centrifuge to their next date, they’re going to have to make do with the finger-ratio test. 

This means that if you notice a woman eyeing your hand longer than it takes to decide if your nails are clean, it’s possible she’s doing a little research of her own.  

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