Body Types Explained: Ectomorph, Mesomorph & Endomorph
Body type theory groups people into three broad somatotypes based on skeletal frame, metabolism, and how the body tends to store fat and build muscle. Understanding yours helps you train and eat smarter.
Ectomorph
A naturally lean, narrow frame with fast metabolism. Ectomorphs tend to have smaller joints, narrow shoulders and hips, and find it harder to gain weight or muscle.
Mesomorph
An athletic, naturally muscular build with shoulders roughly as wide as the hips. Mesomorphs gain muscle and lose fat relatively easily compared to other types.
Endomorph
A solid, naturally curvier build with a wider waist and hips relative to the shoulders. Endomorphs carry weight efficiently and tend to build strength quickly, though metabolism runs slower.
How the calculator works
Enter your height, weight, shoulder width, chest, waist, and hip measurements. We calculate your BMI (weight in kg divided by height in meters squared) and compare your shoulder-to-hip proportions:
- BMI under 18.5 with a narrow frame typically indicates an Ectomorph
- BMI between 18.5–24.9 with shoulders at or wider than hips typically indicates a Mesomorph
- BMI over 25 with a wider hip-to-waist ratio typically indicates an Endomorph
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Frequently asked questions
Can body type change?
Your underlying skeletal frame stays fairly fixed, but body composition (muscle and fat distribution) can shift significantly with training and diet. Many people show traits of more than one type.
Is BMI accurate?
BMI is a useful starting point but doesn't account for muscle mass, bone density, or fat distribution. Our calculator combines BMI with shoulder-to-hip proportions for a more complete picture.
What workouts suit each type?
Ectomorphs benefit from heavy compound lifts with longer rest between sets. Mesomorphs thrive on varied strength and cardio mixes. Endomorphs see the best results from combining strength training with frequent cardio sessions.