Body Type Calculator
Frame Size & Somatotype Estimator
Enter your height, wrist circumference, and sex to estimate your body frame type.
Parameters
Estimated Body Type
Understanding Body Types (Somatotypes)
Body type theory groups people into three broad somatotype categories based on skeletal frame and typical build: ectomorph (slight frame), mesomorph (medium/athletic frame), and endomorph (larger frame). This calculator uses the classic wrist-to-height ratio as a simple frame-size proxy.
Ectomorph
Typically a smaller, narrower bone structure. Often associated with a faster metabolism and a harder time gaining muscle mass.
Mesomorph
A medium, naturally athletic frame. Often associated with responding quickly to strength training.
Endomorph
Typically a larger bone structure. Often associated with an easier time building both muscle and fat.
A Spectrum, Not a Box
Most people are a blend of these categories rather than a pure type — treat this as a general reference, not a rigid label.
The Frame Ratio Formula
Height and wrist circumference in the same unit. A higher ratio (relatively thin wrist for your height) suggests a smaller frame; a lower ratio suggests a larger frame.
Frame Ratio Reference Table
| Body Type | Men (R = Height/Wrist) | Women (R = Height/Wrist) |
|---|---|---|
| Ectomorph (Small Frame) | R > 10.4 | R > 11.0 |
| Mesomorph (Medium Frame) | 9.6 - 10.4 | 10.1 - 11.0 |
| Endomorph (Large Frame) | R < 9.6 | R < 10.1 |
Important Limitations
- A single-measurement proxy: Wrist-to-height ratio is a simplified frame-size indicator, not a comprehensive anthropometric assessment.
- Not a fitness prescription: Your somatotype doesn't determine your training program — people of every body type can build muscle and improve fitness.
- Blended types are normal: Very few people are a "pure" ectomorph, mesomorph, or endomorph.
Key Takeaways
- Body type is a general reference. It describes typical skeletal frame tendencies, not a rigid category.
- Frame size ≠ destiny. Any body type can build strength, lose fat, or gain muscle with the right approach.
- Most people are a blend. Don't over-index on fitting neatly into one of the three categories.
- Consult a professional. Somatotype is a general classification, not a medical or fitness prescription — a trainer or physician can help design a program suited to your actual body composition and goals.