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Body Type Calculator

Somatotype theory, originally developed by William Sheldon in the 1940s and later refined by Heath and Carter into a quantitative scoring system, classifies body builds into three primary categories: ectomorph (lean, narrow frame), mesomorph (muscular, medium frame), and endomorph (wider frame with greater fat storage). While most people are a blend of all three types, one usually dominates. Understanding your primary somatotype can inform smarter training and nutrition strategies.

Quick Answer

Most people are a blend of somatotypes, but one type usually dominates. Ectomorphs are lean and narrow, mesomorphs are muscular and athletic, and endomorphs tend toward a wider frame. No type is inherently better — each responds differently to training and nutrition.

These results are estimates based on general formulas and are not a substitute for professional medical advice. Consult a healthcare provider before making health decisions.

Measure around the narrowest point of your wrist.

Measure around the widest point of your shoulders with arms at your sides.

Measure at the widest point around your hips and buttocks.

Enter your measurements above to discover your somatotype.

How the Formula Works

  1. Calculate BMI from your height and weight. This gives a baseline indication of body density and fat-to-muscle distribution.

    BMI = weight(kg) / height(m)²

  2. Compute the wrist-to-height ratio. A narrower wrist relative to height signals a lighter skeletal frame, pointing toward ectomorphy. A wider wrist signals a denser frame, pointing toward endomorphy.

    Wrist-to-height ratio = wrist circumference(cm) / height(cm)

  3. If shoulder and hip circumferences are provided, calculate the shoulder-to-hip ratio. Broad shoulders relative to hips indicate mesomorphic tendency; relatively wider hips indicate endomorphic tendency.

    Shoulder-to-hip ratio = shoulder circumference / hip circumference

  4. Score each of the three components (endomorph, mesomorph, ectomorph) on a 1–7 scale by combining BMI, wrist-to-height, and shoulder-to-hip signals. The component with the highest score determines your primary body type.

Methodology & Sources

Reviewed and updated April 5, 2026 · Prepared by GetHealthyCalculators Editorial Team

This calculator uses a simplified Heath-Carter-inspired scoring model. It does not apply the full 10-skinfold Heath-Carter protocol, which requires precise caliper measurements. Instead, it uses BMI, wrist circumference relative to height, and optional shoulder and hip circumferences to estimate somatotype component scores. Results are directional, not clinical.

References

  • The Heath-Carter Anthropometric Somatotype — Instruction Manual · San Diego State University
  • Somatotyping: Development and Applications · Carter JEL & Heath BH (Cambridge University Press, 1990)
  • Body composition and somatotype characteristics of elite athletes · Journal of Strength and Conditioning Research

How to Interpret Your Results

Somatotype scores are reported on a 1–7 scale for each of the three components. A score of 1 means very little expression of that type, while 7 indicates strong expression. A classic mesomorph might score 1-6-2 (low endo, high meso, low ecto). Few people are a pure single type; your result shows which tendency dominates.

Ectomorph
1–3 — Lean build with a narrow frame and long limbs. Tends toward lower body fat and muscle mass. Benefits most from a high-calorie diet and heavy resistance training.
Mesomorph
1–7 — Athletic, muscular build with a medium frame. Responds well to exercise and can gain or lose weight relatively easily. Benefits from varied training and balanced nutrition.
Endomorph
1–7 — Wider frame with a greater tendency to store fat. Often has strong legs and a larger bone structure. Benefits from a structured calorie-controlled diet and regular cardio alongside resistance training.

Limitations

  • This tool uses a simplified model and does not replicate the full Heath-Carter somatotyping protocol, which requires precise skinfold caliper measurements at 10 sites.
  • Wrist and shoulder circumferences are proxies for skeletal frame size and muscle mass respectively — they are useful but imprecise compared to direct measurement of bone breadths.
  • BMI is used as a component of the scoring, but it cannot distinguish between fat mass and muscle mass, which can cause misclassification in very muscular or very lean individuals.
  • Somatotype is not a fixed biological destiny. Training, nutrition, and lifestyle choices can significantly shift body composition and how your body expresses each type over time.

Frequently Asked Questions

Can I change my body type?
Your skeletal frame and bone structure are largely determined by genetics and do not change significantly. However, the muscular and fat components of your somatotype are highly responsive to training and nutrition. With consistent resistance training and a well-managed diet, an endomorph can develop a more mesomorphic appearance, and an ectomorph can build substantial muscle mass.
Is one body type healthier than the others?
No single somatotype is inherently healthier. Each type has both advantages and challenges. Mesomorphs often find body composition goals easier to achieve, ectomorphs may have a lower baseline cardiovascular risk, and endomorphs frequently have greater absolute strength. Health is determined far more by lifestyle habits than by body type.
Why do I seem to be a mix of two body types?
Pure somatotypes are rare. In the Heath-Carter system, most people score meaningfully on at least two components. A common combination is ecto-mesomorph (lean but muscular) or endo-mesomorph (strong but carrying more fat). Your result will show the dominant type, but the individual component scores reveal the full picture.
How accurate is this calculator compared to a professional assessment?
A professional Heath-Carter assessment uses 10 skinfold sites, 10 bone breadths, 13 circumferences, and height and weight. This calculator uses a subset of easily available measurements as proxies. The result is a useful directional estimate, not a precise somatotype rating. For competitive sport or clinical purposes, a certified kinanthropometrist should perform the assessment.
Does biological sex affect my somatotype?
Yes. Women naturally carry more essential fat, especially around the hips and thighs, which tends to elevate endomorphic scores compared to men of similar build. The wrist-to-height ratio and shoulder-to-hip ratio are also typically different between sexes. This calculator accounts for biological sex when interpreting results.
What measurements do I need for the most accurate result?
At minimum, you need height, weight, and wrist circumference. Adding shoulder and hip circumferences significantly improves accuracy by incorporating information about your skeletal frame width and fat distribution pattern. Measure shoulder circumference around the widest point of your shoulders and hip circumference at the widest point around the hips and buttocks.

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