What is my body type actually telling me?

That your skeleton is slight, average or broad for your height, and roughly how much mass you carry on it. That is the whole of it. It does not tell you your metabolic rate, which foods suit you, how you respond to training, or anything about your character. The claim that physique predicts temperament came from Sheldon in the 1940s and was discredited.

Why does the calculator ask for my wrist?

Because it carries almost no muscle and very little fat, so its circumference tracks skeletal size and barely changes as weight does. That makes it one of the few measurements on the body that says something about frame rather than about current condition.

Is this a real somatotype?

No. A somatotype in the sense sports science uses it is the Heath-Carter method, which requires skinfold calipers at four sites, two bone breadths and two limb girths, and produces three ratings rather than one label. No calculator that asks only for height, weight and a wrist can produce one, and pages claiming otherwise are overstating what they have.

Should I train or eat differently for my body type?

There is no good evidence for body-type-specific training or diet, despite how commonly it is sold. What responds to training is training; what changes body composition is total energy intake and protein, both of which are set by your size and activity rather than by a category name. The calorie and macro calculators on this site work from those directly.

Why did I get mesomorph?

Most people do, because it is what the scheme returns whenever frame size and BMI do not both sit at an extreme. That is a limitation of sorting a continuous range of human builds into three boxes rather than a statement about you.

Can my body type change?

Frame size, essentially not — the skeleton is what it is once you are grown. The label can change, because it partly depends on BMI, which moves with weight. That is a good illustration of how much of the label reflects current condition rather than build.

Body type calculator

Enter your height, weight and wrist measurement to get your frame size and the closest of the three familiar body type labels. Frame size is a measurement; the label is a description, and it predicts less than you have probably been told.

Result

These are estimates from population-level equations, not a measurement of you and not medical advice. Individual results vary widely. Talk to a doctor or a registered dietitian before making significant changes to how you eat or train.

How this is calculated

Frame size from height and wristdefault

              ratio = height (cm) / wrist circumference (cm)
Male: small above 10.4, large below 9.6
Female: small above 11.0, large below 10.1

Source: Height-to-wrist cut-points as reproduced in Grant J.P., "Handbook of Total Parenteral Nutrition", 2nd ed., 1992, derived from the Metropolitan Life frame-size tables.
Assumes: That wrist circumference stands in for skeletal build, and that the cut-points derived from a mid-century North American insurance population apply to you.
Accuracy: The wrist carries little muscle and almost no fat, so it is a reasonable proxy for skeletal size and changes little with weight. The cut-points are the weak part: they come from insurance-company reference tables rather than a modern population study, and the sex split reflects those reference groups rather than a difference in how skeletons scale. Treat the boundaries as approximate.

Body type label

              Small frame with BMI below 20 → ectomorph
Large frame with BMI 27 or above → endomorph
Everything else → mesomorph

Source: Descriptive only. The three names are from Sheldon W.H., "The Varieties of Human Physique", 1940. The measurement method that survives in sports science is Heath B., Carter J.E.L., "A modified somatotype method", American Journal of Physical Anthropology 27(1), 1967, pp. 57–74, which this page does not implement.
Assumes: That two numbers — frame size and BMI — can stand in for a scheme originally built from photographs and, later, from seven anthropometric measurements.
Accuracy: Weak, and the page says so rather than dressing it up. This is not a Heath-Carter somatotype: that needs skinfold calipers at four sites, two bone breadths and two limb girths, and cannot be obtained from height, weight and a wrist. Most people come out mesomorph, which is a sign the three categories are too few rather than a finding about the population. Sheldon’s original claim — that physique predicts temperament — was discredited and is not repeated here.

Which formula should you use

This page defaults to Frame size from height and wrist. The wrist carries little muscle and almost no fat, so it is a reasonable proxy for skeletal size and changes little with weight. The cut-points are the weak part: they come from insurance-company reference tables rather than a modern population study, and the sex split reflects those reference groups rather than a difference in how skeletons scale. Treat the boundaries as approximate.

Body type label — Weak, and the page says so rather than dressing it up. This is not a Heath-Carter somatotype: that needs skinfold calipers at four sites, two bone breadths and two limb girths, and cannot be obtained from height, weight and a wrist. Most people come out mesomorph, which is a sign the three categories are too few rather than a finding about the population. Sheldon’s original claim — that physique predicts temperament — was discredited and is not repeated here.

Wrist circumference marking each frame size boundary, by height

The wrist measurement at which the frame classification changes. A wrist slimmer than the first figure reads as a small frame; thicker than the second reads as large; between them is medium. Note the direction: a slimmer wrist for a given height means a smaller frame, not a larger one.

Wrist circumference marking each frame size boundary, by height
Height	Small / medium (male)	Medium / large (male)	Small / medium (female)	Medium / large (female)
155 cm	14.9 cm	16.1 cm	14.1 cm	15.3 cm
160 cm	15.4 cm	16.7 cm	14.5 cm	15.8 cm
165 cm	15.9 cm	17.2 cm	15 cm	16.3 cm
170 cm	16.3 cm	17.7 cm	15.5 cm	16.8 cm
175 cm	16.8 cm	18.2 cm	15.9 cm	17.3 cm
180 cm	17.3 cm	18.8 cm	16.4 cm	17.8 cm
185 cm	17.8 cm	19.3 cm	16.8 cm	18.3 cm
190 cm	18.3 cm	19.8 cm	17.3 cm	18.8 cm

Questions

What is my body type actually telling me?: That your skeleton is slight, average or broad for your height, and roughly how much mass you carry on it. That is the whole of it. It does not tell you your metabolic rate, which foods suit you, how you respond to training, or anything about your character. The claim that physique predicts temperament came from Sheldon in the 1940s and was discredited.
Why does the calculator ask for my wrist?: Because it carries almost no muscle and very little fat, so its circumference tracks skeletal size and barely changes as weight does. That makes it one of the few measurements on the body that says something about frame rather than about current condition.
Is this a real somatotype?: No. A somatotype in the sense sports science uses it is the Heath-Carter method, which requires skinfold calipers at four sites, two bone breadths and two limb girths, and produces three ratings rather than one label. No calculator that asks only for height, weight and a wrist can produce one, and pages claiming otherwise are overstating what they have.
Should I train or eat differently for my body type?: There is no good evidence for body-type-specific training or diet, despite how commonly it is sold. What responds to training is training; what changes body composition is total energy intake and protein, both of which are set by your size and activity rather than by a category name. The calorie and macro calculators on this site work from those directly.
Why did I get mesomorph?: Most people do, because it is what the scheme returns whenever frame size and BMI do not both sit at an extreme. That is a limitation of sorting a continuous range of human builds into three boxes rather than a statement about you.
Can my body type change?: Frame size, essentially not — the skeleton is what it is once you are grown. The label can change, because it partly depends on BMI, which moves with weight. That is a good illustration of how much of the label reflects current condition rather than build.

Calculators

Guides

Last reviewed August 20, 2026. Category: Body composition.