Body Type Calculator
Determine body type (ectomorph, mesomorph, endomorph) for fitness planning. Free, fast, accurate — no signup, mobile-fri
Assessment Method
Basic Measurements
Frame Measurements
Body Shape Measurements
Somatotypes Overview
Primary Body Type
Naturally lean, fast metabolism
Secondary Type
Significant secondary characteristics
Ectomorph
Lean type
Mesomorph
Athletic type
Endomorph
Rounder type
Frame Size
Bone structure
Confidence
Assessment accuracy
Somatotype Code
Endomorph-Mesomorph-Ectomorph (1-7 scale)
Key Characteristics
- • Naturally lean and thin
- • Fast metabolism
- • Difficulty gaining weight
- • Small frame and joints
- • Low body fat
How it works
A body type calculator classifies your build into one of three somatotypes — ectomorph (lean, narrow), mesomorph (muscular, athletic), or endomorph (broader, stores fat more easily) — from measurements like frame size and proportions. Most people are a blend.
Somatotypes
Ectomorph: slim, fast metabolism Mesomorph: muscular, gains easily Endomorph: rounder, slower metabolism
- frame
- bone structure (e.g. wrist circumference)
- proportions
- shoulder, waist, hip relationships
Worked example
- Narrow shoulders and wrists, finds it hard to gain weight
- Matches the lean, fast-metabolism profile
Predominantly ectomorph.
Good to know
- Somatotype is a general guide, not destiny — training and nutrition reshape your body regardless of type.
- Most people are a mix (e.g. ecto-mesomorph), not a pure category.
- Use it to tailor approach, not to limit expectations.
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Frequently Asked Questions
What are the three classic body types?
The somatotype model describes ectomorphs (lean, narrow frame, fast metabolism), mesomorphs (naturally muscular, broad shoulders, gains muscle easily), and endomorphs (wider frame, gains fat more readily). Most people are a blend of two types rather than a pure category.
How do I figure out my body type?
Look at skeletal frame (wrist and shoulder width), where your body stores fat, how easily you gain muscle or fat, and how you responded to past training and diet changes. Honest assessment over months beats a single measurement.
Can my body type change?
Your bone structure is fixed, but body composition is very trainable — diet and resistance training change muscle and fat far more than any inherited "type" does. Many people who consider themselves hard gainers or easy gainers simply need different calorie and training targets.
Should I train differently for my body type?
Use it as a loose starting point, not a rulebook: leaner builds often benefit from more calories and heavy compound lifts, while those who gain fat easily benefit from tighter calorie control and added conditioning. Scientific support for strict somatotype-based programs is limited — consistency and progressive overload matter most.