Average Penis Size: According to Science

Table of Contents

• The Average Penis Size Explained
• Average Size by Country
• Average Flaccid Penis Size  
• Average Erect Penis Length
• How to Measure Your Penis
• How to Increase Penis Size 
• Can You Explain Penis Size?
• What Affects Size?
• What Are my Options if I’m Experiencing ED?
• What is the Best Penis Size According to Women?
• Does Penis Size Matter?

The Average Penis Size Explained

Most men believe that the average penis size is six inches. But is this commonly accepted number true in regards to the average penis length?

Not quite. According to a study published by the National Library of Medicine (NIH), the average length is in fact between 12.95 - 13.97cm (5.1 - 5.5 inches). As indicated in the report, oft-cited studies – mixed with a bit of good old-fashioned exaggeration – have led more than a fair share of men to believe that the typical penis size is longer than it is. The study notes that many self-reported measurements regarding penile size come in at 6.63 inches for heterosexual men, and even longer for homosexuals. 

The exaggeration of size is attributed to the measurements being determined by clearly-invested parties – the men themselves, who may suffer from body dysmorphic disorder and not feel as though they stack up against societal-ideals of masculinity. In other words, men are likely to overestimate the size of their penis to make themselves feel good. So, a 6 inch penis is actually bigger than average. 

It's also important to note that the portrayal of penile size in porn has significantly influenced perceptions and expectations among many individuals regarding their own bodily measurements.

Now that we’ve established the truth about the typical penis size, let’s examine how the average penis length is perceived around the world.

Average Size by Country

The truth is - it varies. Referencing another oft-used expression… Variety is the spice of life. But is there some significance to the average penis size based on continent? 

According to WorldData.info, no other question has been asked as frequently as enquiries into the average length of the male genitalia.

Presented below are some interesting insights into typical averages by country of origin:
 

Some interesting observations:

• The longest average penis is boasted by men in Ecuador, with a reported 17.62cm (6.9in) compared to the average male height of 1.67m (5’5³/₄”). The average penis size amounts to an astonishing 10.54% of total height.
• The runner-up belongs to the men of Cameroon, with 16.67cm (6.56in) contrasted against an average height of 1.71m (5’7³/₈”). This accounts for 9.75% of total height.
• The US claims 13.58cm (5.35in) against an average height of 1.77m (5’9⁵/₈”), or 7.68% of total height.
• The UK ranks at number 66 of 86 listed countries, with an average size of 13.13cm (5.17in) measured against an average height of 1.78m (5’10¹/₈”), with the percentage accounting for 7.38% of total height. While by no means as well-endowed as our chart-leading brethren from Ecuador or Cameroon, residents of the UK have bragging rights over some of the folks over in Southeast Asia.

Average Flaccid Penis Size  

Research published by the National Library of Medicine (NIH) claims the average flaccid length of a penis is 9.16cm (3.6in) while a stretched flaccid penis nets a girth measurement of 9.31cm (3.66in).

Average Erect Penis Length

The above research also examined the measurements of a fully erect penis. The average length of an erect penis is 13.12cm (5.16in), while the average erect penis girth is 11.66cm (4.59in). 

How to Measure Your Penis

As is the case with many delicate operations, there exists a proper procedure when it comes to measuring your penis. The presence of a good, firm erection is key to obtaining the proper diagnostic data.

As illustrated below, the ideal way to measure the length of the penis is to position your measuring instrument of choice against the root of the shaft and extend alongside the upper side all the way until you reach the tip.

As pertains to the correct measurement of the circumference, wrap the measuring device gently around the thickest part of the shaft, taking note of where the two sides of the measuring tape meet.

Having gathered the relevant data, it is also worth mentioning that you will likely also want to measure your flaccid penis. Let’s take a look at the relative norms for the average flaccid penis length.
 

How to Increase Penis Size 

Many people try different methods and products to increase penis size, though these strategies often lack scientific validation and can be harmful.
Common approaches believed to enhance penis size include:

Penis Enlargement Surgery

The outcomes and safety of these surgeries are dubious, with mixed reviews on patient satisfaction. Procedures like penoplasty might somewhat increase the flaccid size or girth, but they do not affect the erect length of the penis. The high risks involved are highlighted by potential complications such as scarring, infection, and loss of function.

Penis Pumps

These devices, primarily used for managing erectile dysfunction, create vacuum pressure to temporarily enlarge the penis by drawing blood into it. The enlargement is not lasting, however, and extended use may harm the penis’s elastic tissue, affecting the quality of erections.

Supplements and Pills

Often made with minerals, vitamins, or hormones such as testosterone, these products have not been scientifically proven effective. Some research even indicates harmful effects from long-term use.

Exercises

Methods like jelqing involve manually forcing blood from the base to the tip of the penis to try to extend its size. Although potentially safer than other methods, there is no confirmed effectiveness, and incorrect execution can lead to scarring, disfigurement, and pain.

Penile Traction Devices

Initially designed to treat Peyronie’s disease, which causes curvature and functional problems due to scar tissue, these devices stretch the penis using constant tension. Research shows a slight increase in length after three months of use in patients with Peyronie’s disease, but their effectiveness for others is less studied.
Overall, while numerous products and techniques claim to increase penile length, they are not well-supported by rigorous scientific evidence and pose significant risks.

Lose Weight

Carrying excess weight around the midsection can cause the stomach to protrude over the genital area, leading to the illusion of a smaller penis or what is sometimes referred to as a buried penis. Slimming down can help reveal the actual length of your penis, as losing fat around the pubic bone makes it more visible.

Groom Your Pubic Hair

Just as shedding extra pounds can affect the perceived size of the penis, so can grooming your pubic hair. Trimming or shaving the hair around the base of your penis exposes more of its length, enhancing the visual perception of its size.

Can You Explain Penis Size?

Unfortunately, no. While there has been some significant scientific research attributed to the reasonings behind penis size variations, the truth of the matter is that – much the way our individual heights vary – the length and girth of our sexual reproductive organs is a mystery, encoded largely in genetics and biology. 

As explained in a verywellhealth.com article, we can thank our parents for the sex chromosomes that factor into the size of our penis. The combination of our father’s Y chromosome, containing the ‘male-determining’ or SRY gene, partners up with our mother’s X chromosome, in order to spin the genetic wheel of fortune that results in our penis size.
It is believed that the wildly unique makeup of the X chromosome is the ultimate decider for who gets a large penis, and explains why a set of genetic male siblings may end up with very different members.

What Affects Size?

Perhaps the second most popular question, following the query into the average size of the male reproductive organ, is whether any external factors can influence or improve the size of the male penis.

While no amount of supplements or well-wishing can improve the size of your penis, it is true that erectile dysfunction (ED), can negatively influence the mightiness of a presented penis.

ED reduces the amount of blood that is able to flow to the penis during erection, and therefore limits the firmness of the penis. Reduced blood flow results in a smaller erection (or one that doesn’t fulfil is potential).

Let’s take a look at some of the culprits that contribute to erectile dysfunction:

• Diabetes - Erectile dysfunction is common amongst males with diabetes, especially Type 2 diabetes. This is attributed in part to damaged nerves and blood vessels caused by poor long-term blood sugar control. Some research suggests ED could be a precursor signal of diabetes.
• Obesity - Overweight and obese individuals increase the risk of erectile dysfunction by 30-90% when contrasted against those within a healthy weight range, according to a study published by the International Journal of Impotence Research.
• Heart Disease - A study published by The Mayo Clinic suggests the dysfunction of the inner lining of the blood vessels (endothelium) and smooth muscle causes inadequate blood supply to both the heart and penis.
• Low Testosterone - Testosterone levels are contributors to a male’s ability to achieve an erection. The mix of low testosterone, decreased blood flow to the penis and a corresponding psychological anxiety regarding lack of performance inevitably lead to the onset of ED.
• Conditions Affecting Blood Flow - The Cleveland Clinic attributes hypertension and high cholesterol as potential contributors to the progression of erectile dysfunction in males.
• Nerve Damage - Spinal cord injuries, as well as neurological conditions such as multiple sclerosis, Alzheimer’s and Parkinson’s disease can affect the ability for the spinal cord to activate the autonomic preganglionic neurons that innervate the penile erectile tissue. (A fancier way of saying that nerve damage or neurological conditions can block the nervous system from signalling the penis to become erect.)

If you believe that you’re experiencing the symptoms of ED, consult a medical professional.

What Are my Options if I’m Experiencing ED?

Thanks to the miracles of modern science, solutions for erectile dysfunction are readily available. The most common ED treatments available include:

Sildenafil

Commonly known as Viagra, Sildenafil works by removing the enzyme (protein) known as phosphodiesterase type 5 (PDE5) that breaks down the chemical communication needed to achieve an erection.

Tadalafil

Also known as the non-branded, generic version of Cialis, Tadalafil works by preventing the breakdown of a chemical messenger known as cGMP, another important contributor in the process needed to achieve erection.

Vardenafil

The non-branded, generic version of the drug Levitra, Vardenafil increases available blood flow to the penis by inhibiting PDE5.

Of course, medication isn’t the only available course of action when combating ED. There are natural methodsand techniques designed to temporarily enlarge the penis:

Penis Pumps

Otherwise known as a penis vacuum pump, these devices draw blood into the penis, allowing an erection firm enough to accomplish the task at hand. They remain a popular choice amongst men for whom ED medication is not a viable option.

Cock Rings

Another popular choice for men, penis rings or constriction bands as they are sometimes known as, work by keeping blood flow in the penis for an extended period of time.

Therapy

Depression, stress and anxiety can contribute to the perfect storm that is erectile dysfunction. Consulting a professional can often aid in diagnosing the internal factors presenting very real external problems. The introduction of a therapist or cognitive behavioural therapy (CBT) treatments can help alter the way you think, which could have positive physical outcomes.

Lifestyle Changes 

Don’t underestimate the importance of sleep, maintaining a healthy weight, and an active physical health regimen as factors influencing your sexual health. 

As always, be sure to consult a medical professional should you have any questions regarding your perception of your sexual well-being…and don’t underestimate the power of communication. Communication with your partner, a therapist, friends.

What is the Best Penis Size According to Women?

Here is yet another popular misconception amongst men – men believe that most women have a penis size preference.

Some males worry about whether they have a small penis that won't live up to the desires of a partner.

However, other research suggests that a larger penis is not important for many female partners.

In one study, 77% of femaleswho completed a questionnaire said penis length was unimportant or totally unimportant, compared with 21% who declared it was important or very important. Those who said that length mattered to them also stated that girth, or width, was more important.

In another survey, 45 out of 50 sexually active undergraduate females said that penis width was more important to sexual satisfaction than penis length.

Does Penis Size Matter?

The size of a penis generally does not directly affect sexual function, it can increase the risk of sexual problems. Studies have shown that people who think their penises are small are more likely to have low self-esteem, sexual performance anxiety, relationship problems, and ED

They are also less likely to let others, including doctors, look at their penis. 

Trusting in the confidence of both medical professionals and your partner can go a long way towards re-establishing a healthy perception with your penis. Whether you’re concerned about length, girth or performance, rest assured you’re not alone…and, as this article proves, you’re one of over 4 billion males who will at one time or another, question their penis (or the size of it at least).

Whilst all of our content is written and reviewed by healthcare professionals, it is not intended to be substituted for or used as medical advice. If you have any questions or concerns about your health, please speak to your doctor.