Estimate your general build tendency based on frame and proportions
How Is Build Tendency Estimated?
Somatotype estimation — loosely based on Sheldon's body type categories. This calculator uses wrist circumference, shoulder width, and waist measurements to estimate your general build tendency, not your metabolism or training destiny.
Result: A rough classification into Ectomorph (narrower frame), Mesomorph (broader, more muscular frame), or Endomorph (wider, rounder frame) tendencies.
Important: Most people are a blend of types. Somatotype theory has significant limitations — it describes general frame tendencies, not metabolism speed or ideal training approach
Best used as: a rough self-awareness tool, not a basis for specific training or nutrition decisions
Your Measurements
Enter your measurements to discover your body type
Understanding Body Types
The somatotype system classifies body builds into three broad categories: Ectomorph (narrower frame), Mesomorph (broader, more angular frame), and Endomorph (wider, rounder frame). Most people are a combination of types — pure somatotypes are rare.
Important context: Somatotype theory was developed in the 1940s by William Sheldon and has significant methodological limitations. Modern exercise science generally does not use somatotypes as a basis for training or nutrition prescriptions. This tool is useful for general body-frame awareness, not for determining your ideal diet or training split.
Build Tendency Overview
General Build Tendencies: Ectomorph, Mesomorph, Endomorph
Tendency
Typical Frame
Common Pattern
Ectomorph
Narrower frame, longer limbs
Often finds gaining weight harder
Mesomorph
Broader shoulders, athletic build
Often responds well to strength training
Endomorph
Wider frame, rounder build
Often finds losing weight harder
Note: These are rough frame tendencies, not metabolic diagnoses. Actual metabolic rate depends on lean mass, activity, age, and many other factors — not body type alone.
Frequently Asked Questions
Can I change my body type?
You can't change your genetic predisposition, but you can significantly alter your body composition through training and nutrition. An endomorph can become lean, and an ectomorph can build significant muscle - it just requires the right approach.
How accurate is body type categorization?
Body typing is a rough frame classification, not an evidence-based training or nutrition system. Most people are a mix of types, and your actual response to training and nutrition depends on many factors this tool cannot measure (body fat, muscle mass, activity level, genetics, training history). Use this for general awareness, then use more specific calculators like TDEE, Macro, or Body Fat for real guidance.
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