What's My Body Type?

This tool works differently from most on the site. The vision model is not asked to name a body type at all. It is asked to report five things it can see: how wide your frame looks at the shoulders and wrists relative to your height, how much your torso narrows from shoulder to waist, how much muscle definition is visible, whether your overall build reads as lean, athletic or solid, and how long your limbs are relative to your torso. Anything it can't see clearly is marked unclear instead of guessed, and it is told not to treat clothing bulk, pose or camera angle as evidence.

The site then scores those five observations against the three somatotypes using a fixed set of rules, so the same observations always produce the same label. When two types score close together, you get a blend, such as mostly mesomorph with ectomorph traits. The result also includes a short note on what drove the read and three training and nutrition starting points.

A full-body, front-facing photo in fitted clothing gives the AI the clearest view of your frame and proportions.

The five observations are only as good as the view. Baggy clothing adds apparent frame width and hides the waist, which pulls a result toward endomorph. A wide-angle phone lens held close exaggerates whichever of your shoulders or hips is nearest the camera. Flexing, a pump or dramatic side lighting inflate visible muscle definition and push toward mesomorph. Standing at an angle changes apparent shoulder width and taper, and a photo cropped at the knees makes limb length unreadable, which is why that dimension often comes back unclear.

There is also a limit no photo can fix. All three somatotype components shift as your weight, fat and muscle change, so the result describes your build as it is now, not a type you are locked into. Use it as a loose starting point for thinking about training, not as a label. If you want a formal rating, the Heath-Carter method below uses measurements taken by a trained assessor rather than a visual impression.

The somatotype system was developed in the 1940s by psychologist William Sheldon, who classified physiques into three categories and controversially tried to link them to personality traits and temperament. That personality theory has since been thoroughly discredited and is not supported by modern psychology — but the three-category physique framework itself stuck around in fitness culture as a simple, intuitive starting point for thinking about training and nutrition.

In practice almost nobody is a pure type — most people are a blend, which is exactly what modern sports science expects given how much genetics, training history, and nutrition all interact.

How Somatotypes Are Rated in Sports Science

Sheldon originally rated people by looking at standardized photographs, which is closer to what a photo tool does than most people realize, and also what made his ratings subjective. In the 1960s Barbara Heath and Lindsay Carter replaced that visual judgment with measurements, and their version is the one sports scientists still use. It gives three numbers rather than one label, so a rating written as 3-5-2 lists endomorphy, mesomorphy and ectomorphy in that order, with mesomorphy the strongest here.

Two things follow from that table. Every component depends on something that training or diet can change, so ratings do move over time. And bone breadth, the one input closest to a fixed frame size, is exactly the thing a photo shows least clearly.

Two Myths Worth Dropping

The first is that an ectomorph cannot build muscle. A narrow frame with long limbs gains muscle with consistent training and enough food; it may simply show the gain differently, and a lot of the classic ectomorph look is what anyone looks like before they have trained. A result that says ectomorph is a description of today, not a ceiling.

The second is that your type tells you exactly what to eat or how to train. Research into diets tailored by somatotype is thin, while the basics of total calories, enough protein, progressive training and consistency apply to every build. Treat the training focus table above as a starting point and adjust it to how your body actually responds over a few months.