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Body Type Calculator

Determine your somatotype — ectomorph, mesomorph, or endomorph — based on your height, wrist, and ankle measurements.

What is Body Type Calculator?

A body type (somatotype) calculator uses your skeletal frame size — estimated from wrist and ankle circumference relative to height — to classify you as an ectomorph (lean, narrow frame), mesomorph (muscular, medium frame), or endomorph (broader frame, higher body fat tendency). Understanding your body type can help tailor training and nutrition approaches.

How to use

  1. 1 Enter your height in centimeters.
  2. 2 Measure and enter your wrist circumference (measured just below the wrist bone).
  3. 3 Measure and enter your ankle circumference (measured at the narrowest point above the ankle bone).
  4. 4 Your body type and frame size classification appear instantly.

Formula

Frame index = (wrist_cm / height_cm) × 100. Ectomorph: index < 10.4. Mesomorph: 10.4 ≤ index ≤ 11.0. Endomorph: index > 11.0. Ankle provides a secondary confirmation signal.

Example calculation

A person who is 178 cm tall with a 17 cm wrist: frame index = (17/178) × 100 = 9.55 → Ectomorph (small frame). A 172 cm person with a 19.5 cm wrist: index = 11.3 → Endomorph.

Frequently asked questions

Can I be more than one body type?

Yes. Most people are a blend of types. The somatotype system describes tendencies, not rigid categories. Many fitness professionals use it as a starting point, not a definitive label.

Does body type determine how easy it is to gain muscle?

Body type correlates with natural muscle-building tendencies. Mesomorphs typically build muscle more easily. However, training consistency and nutrition matter far more than body type.

Can I change my body type?

Your skeletal frame (determined by bone structure) doesn't change. But body composition — muscle mass and fat percentage — can be significantly changed through training and diet.

How do I measure my wrist accurately?

Use a flexible tape measure wrapped just below the wrist bone (distal ulna). The tape should be snug but not tight. Measure your dominant hand.

Is this method scientifically validated?

Frame-size-based somatotype estimation is a simplified version of Sheldon's original 1940s system. It is useful as a rough guide but lacks the precision of clinical assessments.