Estimate your somatotype (ectomorph, mesomorph, or endomorph) from your wrist size and height.
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Somatotypes describe general body frame tendencies — ectomorph (lean), mesomorph (athletic), and endomorph (rounder) — first proposed in the mid-20th century. This calculator uses the height-to-wrist-circumference ratio as a simple, practical proxy for bone frame size, which strongly influences your natural body type. Keep in mind this is a general tendency, not a fixed category — training and nutrition still shape your results significantly. The three-category system (ectomorph, mesomorph, endomorph) comes from American psychologist William Sheldon's 1940s research, which originally — and controversially, now largely discredited — tried to link body structure to personality traits. Only the body-structure classification survived into modern fitness use, as a rough framework for understanding how different builds tend to respond to training and nutrition, estimated here from wrist circumference relative to height. Rather than treating the result as a fixed label, it's more useful to see it as a starting hypothesis about how your body might respond to different training and nutrition approaches — one that's worth testing and adjusting based on your own real results, since individual response varies far more than any single classification captures.
The idea of classifying bodies into ectomorph, mesomorph, and endomorph "somatotypes" comes from American psychologist William Sheldon's work in the 1940s, which originally tried — controversially, and now largely discredited on that front — to link body shape to personality and temperament. What has survived and remains genuinely useful is the simpler descriptive part of the framework: three general tendencies in how bodies build and store mass, based mainly on bone structure, natural muscle-building tendency, and typical fat storage pattern.
Ectomorphs are typically described as having a naturally lean, narrow frame with long limbs and a fast metabolism, often finding it harder to add muscle mass ("hardgainers") but easier to stay lean. Mesomorphs tend toward a naturally athletic, muscular build with a wider frame, often gaining muscle relatively efficiently in response to training. Endomorphs typically carry a rounder frame with a higher natural tendency to store fat, and often build both muscle and fat more readily than the other two types when eating in a surplus.
Almost nobody is a pure example of any single type — most people are combinations, and where someone lands is estimated here from simple, non-invasive inputs like wrist and ankle circumference relative to height, which loosely correlate with skeletal frame size. The main practical value of identifying a dominant tendency isn't a rigid label but a starting point for calibrating expectations: an ectomorph training for muscle gain may need a larger calorie surplus and different training volume than an endomorph pursuing the same goal, and knowing your general tendency can help set more realistic timelines and adjust a nutrition or training plan rather than following generic advice built for a different body type. Most people benefit from experimenting with different training styles rather than assuming their estimated type dictates a fixed approach.
Your frame size stays fairly fixed, but muscle and fat levels within any body type can change significantly with training and diet.
Yes — most people are a blend of all three categories rather than a pure single type, and this classification is only a rough starting guideline, not a strict biological category.
No — each type simply responds differently to training and nutrition; none is inherently better.