Sexual Health
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Statistical breakdown of penis size in the United States

As a way to deal with trolls, here is a statistical breakdown of penis size in the United States.

First off, I would like to say that the mean (connotated as μ later on) is based off of the January 2015 study that established that the average penis length in the US was 5.17 inches long.

References:

https://www.medicalnewstoday.com/articles/271647.php

https://news.sciencemag.org/biology/2015/03/how-big-average-penis

https://www.cnn.com/2015/03/05/health/normal-penis-size/

That said, there are constantly questions on this site, and on the internet in general asking "I'm 15 and my penis is 500 inches long, is this normal?". And one thing that the study also published along with the average length, is the standard deviation, which is 0.8 inches. To explain this simply, Standard Deviation (later connotated as σ) is a number that states the distance a result is from the average.

Now, penis size on a bell curve has a mean (μ) of 5.17, and a Standard Deviation (σ) of 0.8. That means that the exact center average size of the penis in the US is 5.17 inches long, and 68% of ALL penises in the US will fall between 4.37 inches and 5.97 inches long. This is quickly notated as (μ ±σ), or 5.17 ±0.8.

As a way to deal with trolls, here is a statistical breakdown of penis size in the United States.

When you look at this bell curve, you will see that the mean is directly in the center, and the farther you get from that center the smaller the amount of results in that category. The way this is broken down for penis size is exactly the same. 68% of all penises in the US will be within 0.8" of the average, 95% of penises will be within 1.6" of the average, and 99.7% of all penises will be within 2.4" from the average. To break this down further, we can say:

-68% of penises are between 4.37" and 5.97"

-95% of penises are between 3.57" and 6.77"

-99.7% of penises are between 2.77" and 7.57"

Now, what does this mean exactly? One, if you are within a single standard deviant of the mean, you fall within the "size doesn't matter" area because you aren't far enough from the average for it to really have an affect on anything. But more importantly, two: we can easily calculate the chance of the ridiculous internet claims actually being true.

Let's take the most common internet penis size claim, 8 inches, and look at the chance of that person not being full of shit. (8.0-5.17)=2.83, (2.83/0.8)=~3.5

- A penis being μ ± 3.5σ has a population range of 0.999534741841929. Which means that only 1 person in 2149 people will fall that far from the mean. Only one in 2149 men in the US have a penis of at least 8 inches.

Now, in case you're wondering where you fall in on this scale, or how likely someone making a ridiculous penis claim is to be lying, I have broken down a short list of sizes and a rough corresponding probability.

About 1 inch, σ=5.21, (μ - 5σ) ~1 in 1,744,278

About 2 inch, σ=3.96, (μ - 4σ) ~1 in 15,787

About 3 inch, σ=2.71, (μ - 3σ) ~1 in 370

About 4 inch, σ=1.46, (μ - 1.5σ) ~1 in 7

About 4.5 inch, σ=0.84, (μ - σ) ~1 in 3

About 5 inch, σ=0.21, (μ) ~2 in 3

About 5.5 inch, σ= 0.33, (μ+0.5σ) ~2 in 3

About 6 inch, σ=1.03, (μ + σ) ~1 in 3

About 6.5 inch, σ=1.66, (μ + 1.5σ) ~1 in 7

About 7 inch, σ=2.29, (μ + 2σ) ~1 in 22

About 7.5 inch, σ=2.91, (μ + 3σ) ~1 in 370

About 8 inch, σ=3.54, (μ + 3.5σ) ~1 in 2149

About 9 inch, σ=4.79, (μ + 4σ) ~1 in 15,787

About 10 inch, σ=6.04, (μ + 6σ) ~1 in 506,797,346

About 11 inch, σ=7.29, (μ + 7σ) ~1 in 390,682,215,445

I am going to stop there, as any further becomes pretty much incalculable. The world's largest penis, 13.5 inches long belonging to Jonah Falcon is almost 10.5σ from the mean, which is a deviation nearing impossibility.

According to these statistics, there MIGHT be one single man in the United States with a penis that is 10 inches long or more.

Probability of results taken using:(https://en.wikipedia.org/wiki/Standard_deviation#Rules_for_normally_distributed_data )

I understand that this is delving far more into this particular subject than is needed, but I did this as a way to show that with most of these claims on here, say 8 inches again as example, only have a 0.00047% chance of being true. And something as ridiculous as a 10 inch penis only has a chance of 0.000000002%.

Now, the average length per country does differ slightly, but for locations such as the US, UK, or Canada, these number are largely the same.

1 6

Most Helpful Guy

  • average size of internet penis: anywhere from 8-10 inches.

    "According to these statistics, there MIGHT be one single man in the United States with a penis that is 10 inches long or more". - yeah but at least a couple of people on here will state they're packing a 10 incher. the internet magically makes the laws of average obsolete.

Most Helpful Girl

  • Also guys. We know you're lying when you say you have an 8"dick. We are not impressed. Even if you did have an 8" dick it's unattractive that you're telling everyone. And tbh I am a little scared of dicks that big so goodbye.

    • Is it true you want girth more anyways?

    • Are you like = Oh my god! It will tear me into 2

    • @curiousdude89 I suppose that's more important but neither are as important as you'd think @nik1hil maybe not that exactly. My first thought is: "that's never going in me. "

    • Show All

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What Girls & Guys Said

11 48

  • Lol I like this.

    • I almost feel like writing a penis size translation chart. If he says: 8" then it's actually 6.5" 9" is actually 5.5" 10" so 5.0" 11" then 4.5" 12" is really 4.0" Finding someone with a penis longer than 7" is a bit like winning the lottery and bigger than 8" is like finding a unicorn lol. Why do people want penises that large anyways? Vaginas can fit around 6", I think average length is 4" or something like that?

  • You do realize that only about.000047% of readers actually read more than the first 2 sentences.

    • Nah, I read the whole thing and I'm sure many other people did too. This must've taken forever to write, so I wanted to give it a chance until the end. Glad I did, it was wicked interesting!!

    • @squidneyy wow, well I'm impressed!

    • Yaaay, I'm impressed that you read it too then! 😁

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  • Bravo! Most informative MyTake so far,

    You should seriously be given a GaG medal.

  • You put quite some research into this. I have never really measured the length of my penis as I pretty much assumed it is average. But now I'm kinda intrigued :D Will have to google first how to measure it correctly though. I think some of these exaggerating claims can also be interpreted as people not knowing where to start measuring it. I really don't know what the standard procedure is. It's the same with waist circumference. There is no guarantee every doctor will get the same result for measuring the same person. In fact the deviation is quite large.

  • My penis is 11 inches long and I find this very offensive because it suggests incorrectly that I am sarcastic or being a troll, I highly resent you.

  • Hilarious! =)

    Hopefully this ends all the penis questions FOREVER!

    • there will never be an end to penis questions :-/

    • not likely the site is obsessed with them , just like some guys are obsessed with Boobs

    • lol there will never be an end too penis questions LOL PRICELESS

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  • LOL so many inferior guys are giving opinions here. xD

  • Have you considered doing a similar take for boob size? There are an equal number of silly questions: "My boobs are too small; I only have 38DD boobs. Will he ever love me"?

    • I'll think about it. To be honest, there probably isn't as much information readily available since measuring is slightly more complicated. If I can find enough about it I will.

  • oooo lucky or unlucky me, I'm finally a part of the 1%... YAHOOOOO!

  • Oh My God. Where were you when I needed someone to do my math homework in highschool?
    Excellent take.

  • It'll never be over. Size does matter and anything smaller then 7 inches isn't satisfying and anyone that denies it is lying! On the contrary, men dont ever want to and won't touch boobs any smaller then a D cup so why should us women touch a penis smaller then a 7? Truth!!

    • What are you talking about? I'm fine with B cups. A cups, I avoid. It feels almost pedophilic to be with an A cup. C cups are about right. Anything larger than D, however, I find too large.

    • @ObscuredBeyond It's a joke dude.

    • any smaller than D cup? all boobs are good, except plastic ones... your in a small group of the population , probally the result of being hammered with Bs expectations from the media ,, drop back to reality

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  • Sorry, ladies. About 6" on a good day is as good as it's gonna get for most of you. But size isn't everything. Stamina is the other one. If literally anything is killing his mojo, he won't have the stamina to keep it going. Especially if you expect too much and stretch yourself out too much before he gets there.

    Boredom is as big a risk of promiscuity as are STDs and pregnancy.

  • Man you KILLED it! I have been waiting for someone to do something like this to shoot down all of the bullshiterstwhile and girls that "prefer 7 inches or more"

    • Bullshiters*

  • Just wanted to say THANK YOU so much for writing this take!

  • There are a ton of posts from women saying all they will accept are 8 inches (sometimes 7) or more. I usually tell them "good luck" in finding them. I love this report since I guess I crush the average. although it all depends on how you measure...

    • True true and true. It depends on how you measure it, it depends on how you phrase the data to convey average, etc. But it's always fun to know I either have a 'large average' or I simply crush the average. And some of my friends claim to have some big fuckers, I just wonder if they're all that far off. But most of all, I think back to the time a cute young woman turned me off big time when we were texting, and she wanted to know if I had a big dick, she only liked em real big. I just thought it was a skanky thing to say, and didn't consider myself big (I mean shit, I watch porn). But the fact is, maybe my penis would have exceeded expectations? Just goes to show everything is subjective, dont believe everything you see or hear, and to live life and love yourself like you've only got one dick!

  • When flirting via sexy photos, I just send softies now to troll

  • Are you sure it's a normal distribution though?

    • There is a slight rightwards skew, but very slight. From what I understand, the majority of the perceived differences between small and large penises are all based on the higher likelihood of someone lying about or mentioning it when they are above average, not below.

    • Ah okay, that makes sense.

  • I just have to giggle at the fact that men apparently spend so much time and energy thinking and pondering about penises. Your very detailed take, and the 18:1 ratio of male and female commenters on this take... Lol

    Now according to some weird ass gagers (who think that a girl must be a lesbian if she finds another girl attractive), you and all the male commenters must be gay if you think about penises that much. Hey don't downvote me! I'm just using the "logic" some male gagers have used and having some fun ;)

    • You're right, it's time for a boob bell curve!

    • @Someguy17 lol

    • @Someguy17 you won't like the results

  • This was awesome. Thanks for posting.

  • "Let's take the most common internet penis size claim, 8 inches, and look at the chance of that person not being full of shit. (8.0-5.17)=2.83, (2.83/0.8)=~3.5"

    Ahahaha! #dead

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