Ultimate Guide to Body Types | Endomorph, Mesomorph, Ectomorph Calculator

Ultimate Guide to Body Types | Endomorph, Mesomorph, Ectomorph Calculator

Next time you step into the gym, stop, look around, and examine the body types utilizing each area of the gym. Every person has a unique body, but there are some main characteristics across them all.

We want to help you figure out where you fit into the main body types: endomorph, mesomorph, and ectomorph. 

In this article, we will dig a bit deeper into the differences in body types, take a more detailed look at their bone structure, and dive into fat and muscle distribution.

In the 1940's, William Sheldon, PhD, MD, attempted to group individuals based on bone structure and weight distribution. [1] His studies yielded three primary body types called somatotypes - ectomorph, mesomorph, and endomorph.

Each somatotype was said to have unique characteristics that may influence an individual's preferred form of physical activity based on their strengths and weaknesses.

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Dr. Sheldon further expanded on this concept of body types in his 1954 book entitled Atlas of Men. He offered a three-digit scaling system to determine someone's somatotype. Each digit, based on predefined criteria, ranges from 1 to 7 where a pure ectomorph is 1-1-7, a pure mesomorph is 1-7-1, and pure endomorph is 7-1-1. [2]

He likely designed this system after receiving a critique someone may exhibit characteristics of more than one somatotype.

The 3 Primary Body Types - Somatotypes

Now that we have discussed the history of somatotypes, let us examine the three pure somatotypes - the ectomorph, the mesomorph, and the endomorph.

The Ectomorph


The ectomorph body type is your stereotypical self-proclaimed hard gainer. An ectomorph has a hard time adding mass to its long and lean build, but naturally carries less fat than other somatotypes.

In general, ectomorphs have a high forehead, receding chin, narrow shoulders, hips, chest, and abdomen, as well as thin arms and legs. [3] From the personality standpoint Dr. Sheldon describes ectomorphs as intellectual, introverted, emotionally restrained individuals who crave isolation and solitude due to their tense, anxious, and secretive nature. [4][5]

Ectomorph body types typically do not excel at power and strength sports since they have a hard time gaining muscle mass, but they do excel in endurance sports and gymnastics. [3] Being able to naturally maintain very low levels of body fat allows ectomorphs to keep a high strength to bodyweight ratio as well as undergo less physical stress during repetitive movement long-duration activities such as running and cycling compared to mesomorphs or endomorphs.

One study of 63 men ages 18-40 years found that ectomorphs had the greatest ratio of carbon dioxide produced to oxygen consumed in one breath as well as the lowest peak oxygen uptake during peak exercise. [6] Because of their smaller surface area, ectomorphs can regulate their body temperature and breathe more efficiently than mesomorphs and endomorphs; a trait that is particularly important in aerobic endurance activities.

Famous athletes with an ectomorph somatotype include Frank Zane, Ulisses William Jr., Michael Phelps, Lance Armstrong, Kevin Garnett, Manny Pacquiao, Usain Bolt, and Bruce Lee.

The Mesomorph


The mesomorph body type is your stereotypical ideal bodybuilding physique. Mesomorphs are athletic, strong, not underweight or overweight, and can increase and decrease their bodyweight weight with minimal effort. [1]

In general, mesomorph body types have a wedge-shaped body, cubical head, broad shoulders, muscular arms and legs, narrow hips, minimal fat, and are narrow when viewing their side profile. [3] From the personality standpoint Dr. Sheldon describes mesomorphs as rugged and thick-skin individuals who are extroverted, aggressive, direct, dominant, courageous, and prone to physical activity and taking risks. [4][5]

Mesomorphs have the ideal physique for physical activities requiring strength, agility, and speed such as football, wrestling, and Olympic lifting. They are the genetically gifted individuals that can easily maintain low body fat, increase or decrease weight based on the requirement of their preferred physical activity, and develop all muscle groups evenly. [3] These individuals are the ideal athlete because they not only have a medium bone structure and height but they typically excel at both cardiovascular and resistance training activities.

Famous athletes with a mesomorph somatotype include Arnold Schwarzenegger, Jay Cutler, Anna Kournikova, Bo Jackson, and Jackie Chan.

The endomorph


The stereotypical endomorph body type gains weight easily so they naturally carry significant amounts of both mass muscle and fat mass, but they are not necessarily always overweight. In general, endomorphs have a pear-shaped body, short arms, and legs, a round head, wide hips and shoulders, significant amounts of fat on the body (especially upper arms and thighs), and are wide when viewing their side profile. [3]

From the personality standpoint, Dr. Sheldon describes endomorphs as sociable, easy-going, slow-to-react, easily complacent, comfort-seeking individuals that enjoy food, people, and affection. [4][5] Endomorphs do not excel in activities requiring high levels of agility, speed, or weight-bearing aerobic activity like running but do excel at pure strength activities like powerlifting, rugby, and playing the lineman position in football.

Endomorph body types can quickly gain fat and lose conditioning if they decrease or discontinue physical activity. However, they typically have a large lung capacity which is beneficial in non-weight-bearing aerobic activities like rowing and they can increase their muscle mass much quicker than ectomorphs. [3]

Famous athletes with an endomorph somatotype include Benedikt Magnusson, Konstantin Konstantinovs, Lee Priest, Vince Wilfork, and Ndamukong Suh.

Body Type - Step 1 of 10
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Somatotype Calculator

Now that we have discussed the characteristics of the three primary body types, the somatotype calculator below provides you with your somatotype blend. Although rare, you may be a pure ectomorph, mesomorph, or endomorph. Most individuals are a blend of these three somatotypes.

Ectomorph body type tendencies:

  • Lean and thin
  • Narrow hips, chest, and shoulders
  • Do not have much muscle OR fat
  • Long legs and arms
  • Higher forehead and thinner face

Mesomorph body type tendencies:

  • Naturally muscular
  • Narrow hips and wide shoulders
  • Strong legs and arms
  • Modest amount of body fat

Endomorph body type tendencies:

  • Larger frame
  • More body fat than most
  • Narrow shoulders and wider hips
  • Slim ankles and wrists
Female Bodytypes

Limitations of Using Somatotype Classification

On the surface, the somatotype classification system sounds logical and useful. However, there are a few glaring limitations.

Firstly and most importantly it's extremely rare to find someone who is a pure version of one of the three primary somatotypes. Most individuals exhibit characteristics of two or even all three somatotypes. One study of 524 men and 250 women found that 95% of subjects fell within five somatotype categories - endomorphic/mesomorphs, mesomorph/endomorphs, mesomorphic/endomorphs, balanced mesomorphs, and ectomorphic/mesomorphs. [7]

Additional classifications include ectomorphic/endomorphs that have pear-shaped bodies with small upper bodies and high-fat accumulation in the hips and thighs as well as endomorphic/ectomorphs that have apple-shaped bodies with small lower bodies and high-fat accumulation in the midsection. [1] As you can see, with the exception of a balanced mesomorph, none of those aforementioned classifications are pure somatotypes. This study also found men were most likely to be endomorphic/mesomorphs and women were most likely to be mesomorph/endomorphs. [7]

Related: Bench Press One Rep Max and Percentage Calculator

Another study of men and women found that the average distribution of somatotypes is 51.6% endomorphic/mesomorphs, 17.1% mesomorph/endomorphs, 16.7% mesomorphic/endomorphs, 6.1% balanced mesomorphs, and 3.0% ectomorphic/mesomorphs. [8] 65% of men in this population were endomorphic/mesomorphs and those 40+ years old shifted towards more of a mesomorph somatotype. [8]

This indicates that your somatotype classification is not static and can shift over time.

On average mesomorphic/endomorphs typically have a higher lean body weight compared to endomorph/ectomorphs and endomorphic/ectomorphs. [9] Mesomorphs typically carry a significant amount of muscle with minimal fat mass and when paired with the large frame of an endomorph, this is the recipe for a large and muscular individual.

Furthermore, the average lean body weight to weight ratio, lean body weight to total adipose tissue weight ratio, and total body water to weight ratio were lowest for mesomorphic/endomorphs. [9] This further indicates that mesomorphic/endomorphs carry a significant amount of lean mass and minimal fat mass.

Secondly, Dr. Sheldon's attempted correlation between somatotype and personality is exceptionally inaccurate. I know plenty of outgoing ectomorphs, non-aggressive mesomorphs, and introverted endomorphs. Personality and somatotype are mutually exclusive characteristics.

Furthermore, playing into the somatotype classifications encourages individuals to victimize their situation and avoid activities they may enjoy in fear their body type is not built for such activities. For example, I have broad shoulders, short legs, long arms, and do not have a narrow side profile, but that did not stop me from running cross country in high school. Instead of victimizing my body type I embarked on a proper training regimen which resulted in my 5k PR of 18:12 which works out to a 5:51 mile pace.

In conclusion, the somatotype classification system is an interesting yet outdated tool for grouping individuals based on their bone structure and weight distribution. Somatotypes have no correlation to personality types but somatotypes can be a useful tool for examining common or ideal body types for specific sports.

1) "THE 3 SOMATOTYPES." University of Houston. N.p., n.d. Web. 23 June 2015.
2) Sheldon, William Herbert (1954). Atlas of Men: A Guide for Somatotyping the Adult Male at All Ages. New York: Harper.
3) "Body Type and Build - Somatotype." Direct to Home Page. N.p., n.d. Web. 23 June 2015.
4) Kamlesh, M.L. (2011). "Ch. 15: Personality and Sport § Sheldon's Constitutional Typology". Psychology in Physical Education and Sport. Pinnacle Technology. ISBN 9781618202482.
5) Roeckelein, Jon E. (1998). "Sheldon's Type Theory". Dictionary of Theories, Laws, and Concepts in Psychology. Greenwood. pp. 427?8. ISBN 9780313304606.
6) "Association of Dominant Somatotype of Men with Body Structure, Function During Exercise, and Nutritional Assessment. - PubMed - NCBI." National Center for Biotechnology Information. N.p., n.d. Web. 23 June 2015.
7) "Somatotype and Disease Prevalence in Adults. - PubMed - NCBI." National Center for Biotechnology Information. N.p., n.d. Web. 23 June 2015.
8 )"Somatotype, Nutrition, and Obesity. - PubMed - NCBI." National Center for Biotechnology Information. N.p., n.d. Web. 23 June 2015.
9) Komiya, S., et al. "Body Size and Composition in Different Somatotypes of Japanese College-aged Women." National Center for Biotechnology Information. Appl. Human Sci., Jan. 1996.
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Tayrus Christian Dave - October 3, 2023


Dan - May 19, 2020

Not a thoroughly fleshed out concept (pardon the pun), but, the distinctions have their merits. It’s a far better basis of assumption than the stick-figure based BMI system currently in use. While America does have an obesity problem, the BMI nonsense makes it seem like it’s 80% of American’s, when it’s rally 50% or more Americans just don’t fit on their scale. I’m 5’7" and won’t be under 175# without chemo. (or similar medical crisis) the idea that a man in his 50s, my height can be healthy and 118# is simply ridiculous. Lifelong runners can perhaps reasonably fit the 154# upper end of that scale. That represents about 20% of men my age/height. The rest of us need something better to go by.

favorboy - April 18, 2019

majority of all human beings living on planet Earth are mixed body types ,I have a fast metabolism ,am muscular but yet I carry between 20 to 25% body fat am meso was skinny at early childhood what body am i

favorboy - April 18, 2019

majority of all human beings living on planet Earth are mixed body types ,I have a fast metabolism ,am muscular but yet I carry between 20 to 25% body fat am meso was skinny at early childhood what body am i

Rich - February 22, 2019

When I was in the army, I didn’t put on muscle and my weight got below 150 lbs (I am between 5’10" and 6’). I recently had my weight get over 270 lbs. Is there such a thing as an mobidly obese ectomorph? I am not sure what I have. I put on muscle like an ectomorph but weight like an endomorph.

Alexander Drake - January 24, 2019

This body type study is very useful and also very deceiving at the same time, but as it says you can have traits of all three, so most people are a mixture of these. I personally am mesomorph and endomorph. I’ve always been built muscular and chubby. But when I work out I blow up and slim down pretty quickly without spending much time in the gym.

konstans negativ kovfefe - January 11, 2019

I was not expecting Carter’s regressive formulas but this is straight up bullshit

Rotten Girl - January 11, 2019

How the hell is a doctor going to correlate body type with personality? Sounds like someone needs to take a research methods class again because we all know correlation is a finicky bird who sings to the tune of biased presumption.

Brennen Pacheco - January 11, 2019

I wonder if these “body types” are merely a manifestation of certain individuals habits and mental disposition. Hmm..

Brennen Pacheco - January 11, 2019

I’ve always been a mesomorph. It’s hard to find clothes that fit.

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