Body Type Calculator

A body type calculator estimates whether your build leans ectomorph (linear), mesomorph (sturdy) or endomorph (rounder). This one uses three tape measurements: height, wrist and waist. For example, a 5 ft 10 in man with a 7-inch wrist and a 34-inch waist has a medium frame and a waist-to-height ratio of 0.49, and the calculator's rough scores are 59% mesomorph, 24% endomorph and 17% ectomorph. It shows a blend because almost nobody fits one pure type.

Body type is a description of build, not a health number. For specific figures, use the Body Fat Calculator for body fat, the Waist to Height Ratio Calculator for the health boundary of 0.5, and the TDEE Calculator for your daily calories.

Where somatotypes come from

The ectomorph, mesomorph and endomorph names come from psychologist William H. Sheldon, who in the 1940s tied body types to personality and character. A history of somatotyping describes his eugenic views and how his former assistant, Barbara Honeyman Heath, publicly denounced his methods as fraudulent and his somatotypes as inaccurate (Vertinsky, 2007). Heath and J. E. Lindsay Carter then published a modified, measurement-based method in 1967. The Heath-Carter somatotype rates every person on three components from skinfolds, bone breadths, limb girths, height and weight: endomorphy (relative fatness), mesomorphy (relative musculoskeletal robustness) and ectomorphy (relative linearity). Sport scientists still use it; the link to personality has not survived.

How this body type calculator works

A tape measure at home cannot do a Heath-Carter assessment, so this calculator uses three simple signals instead:

A slim wrist for your height raises the ectomorph score; a medium or large frame with a moderate waist raises the mesomorph score; a waist that is large relative to height raises the endomorph score. The calculator combines these with its own weighting and scales the three scores to 100%. The weighting is a heuristic chosen for this tool, not a published formula, so the percentages are best read as a rough picture of your proportions.

Step-by-step example

Here is the calculator's default: a man who is 5 ft 10 in (70 inches) with a 7-inch wrist and a 34-inch waist.

With a 6.3-inch wrist and a 31-inch waist at the same height, the frame becomes small, height divided by wrist rises to 11.1 and the waist ratio falls to 0.44, so the leading tendency flips to ectomorph (62% ecto, 38% meso).

Body type by wrist and waist (5 ft 10 in man)

This matrix shows the leading tendency and the full blend for a 70-inch man across common wrist and waist sizes.

Scores come from this calculator's heuristic and shift with height and the male or female setting.

Frame size chart (MedlinePlus)

MedlinePlus, from the National Library of Medicine, estimates body frame from wrist circumference and height:

MedlinePlus lists men's cut-offs only for heights over 5 ft 5 in; the calculator applies them to all men. A wrist exactly on a boundary counts as medium.

The three body types explained

• Ectomorph: a linear, slender build; in this calculator, a slim wrist for your height and a waist well under half your height.
• Mesomorph: a sturdy build with a medium to large frame; in the Heath-Carter method this component reflects muscle and bone robustness, which a tape measure can only hint at.
• Endomorph: a rounder build; in this calculator mostly a waist that is large relative to height.

Fitness media often add claims such as "ectomorphs have a fast metabolism" or "endomorphs gain fat easily". These are not established by measurement. Resting metabolism mostly follows body size, age and sex, which is why the Mifflin-St Jeor equation predicts it from weight, height, age and sex alone.

How sport scientists rate somatotype (Heath-Carter)

The research version needs ten body dimensions: height, weight, four skinfolds, two bone breadths and two limb girths, taken by a trained anthropometrist (Campa et al., 2020). Each component has its own equation, and the result is written as three numbers in the order endomorphy-mesomorphy-ectomorphy. A 2019 study of artistic gymnasts, for example, reported a mean of 2.02-6.40-2.04 for senior gymnasts, a balanced mesomorph, and 1.75-4.96-3.23 for juniors, an ectomorphic mesomorph (Sterkowicz-Przybycień et al.). Combinations of the three ratings are grouped into 13 categories with names like these.

Ectomorphy is the one component you can work out at home, because it needs only height and weight. A man who is 5 ft 10 in (177.8 cm) and weighs 170 lb (77.1 kg) has a cube root of weight of 4.2564, so HWR = 177.8 ÷ 4.2564 = 41.77 and ectomorphy = 0.732 × 41.77 − 28.58 = 2.0. The same equations give these ratings:

Heath-Carter ectomorphy from the height-weight ratio. 0.1 is the method's floor for a heavy build relative to height. These ratings are a different scale from this calculator's percentages and cannot be converted into them.

What do ratings look like in practice? In a 2025 study of 889 Mexican athletes across 43 sports, the most common somatotype among men was endomorphic mesomorph (52.4%), followed by balanced mesomorph (17.6%) and ectomorphic mesomorph (13.6%). Among women, the most common were endomorphic mesomorph (24.5%), mesomorphic endomorph (24.0%) and mesomorph-endomorph (21.4%). Among men, mesomorphy was highest in track and field and ectomorphy in sprint events; among women, endurance athletes had the highest ectomorphy (Martínez-Mireles et al.).

How to use this body type calculator

1. Choose units: imperial (feet and inches) or metric (centimeters); switching converts your entries.
2. Select sex: it changes the MedlinePlus frame cut-offs and the scaling.
3. Enter your height.
4. Measure your wrist: just below the wrist bone, snug but not tight.
5. Measure your waist: at the narrowest point, relaxed, after a normal breath out.
6. Read the result: your leading tendency, the blend, your frame size and the ratios behind it, updated as you type.

Who this calculator is for

• Curious lifters and athletes who have heard the somatotype terms and want a rough read of their build.
• Students learning about somatotyping and frame size.
• Self-trackers who want to see how their waist-to-height ratio and frame compare as they train.

Training and nutrition: what actually matters

This calculator does not set diet or training by body type. Whatever your label, the same levers apply:

• Calories: estimate maintenance with the TDEE Calculator and adjust for your goal; check against your weight trend after a few weeks.
• Protein: the 2025-2030 Dietary Guidelines set a goal of 1.2 to 1.6 g per kg of body weight a day; the Protein Calculator turns that into grams.
• Training: strength training builds muscle and aerobic exercise builds fitness for every build; progress comes from consistency and gradual overload.
• Waist size: if your waist-to-height ratio is 0.5 or more, a modest calorie deficit is the main lever for bringing it down.

Key terms explained

• Somatotype: a description of build on three components: endomorphy, mesomorphy and ectomorphy.
• Heath-Carter method: the measurement-based somatotype from 1967, using skinfolds, bone breadths, girths, height and weight.
• Frame size: small, medium or large skeleton, estimated here from wrist size and height.
• Waist-to-height ratio (WHtR): waist divided by height; a 2010 systematic review supported 0.5 as a general boundary for both sexes.

What changes the result the most

• Wrist circumference: sets the frame and the linearity score; a small wrist for your height pushes toward ectomorph.
• Waist circumference: the main roundness signal; a larger waist relative to height lifts the endomorph score.
• Height: appears in both ratios and in the women's frame cut-offs.
• Sex setting: changes the frame cut-offs and scaling.

Why most people are a blend

The Heath-Carter method gives everyone three ratings, one per component, rather than a single type, and most people sit somewhere between the extremes. This calculator follows the same idea by showing three percentages. When the top two are within 8 points, it calls the result a close blend, which simply means your proportions do not point strongly one way.

Tips for an accurate measurement

• Use a soft, flexible tape measure and keep it level.
• Measure the wrist just below the bony bump, snug but not compressing the skin.
• Measure the waist at its narrowest point after a normal breath out, without pulling in.
• Take each measurement twice and use the average if they differ.

Limitations and assumptions

• The scores come from this calculator's own heuristic, not from a validated somatotype method.
• It uses wrist and waist as proxies; it cannot measure muscle, so very muscular people may get a higher endomorph score than their body fat warrants.
• The MedlinePlus frame chart has no separate cut-offs for men 5 ft 5 in or shorter.
• It is not a health assessment; for health screening, use the waist-to-height ratio or a body fat estimate and talk to a clinician.

How it compares to related calculators

• To estimate body fat, use the Body Fat Calculator.
• For a weight range by height, use the Ideal Weight Calculator or the BMI Calculator.
• To estimate muscle mass, use the Lean Body Mass Calculator or the FFMI Calculator.
• For your silhouette from bust, waist and hips, use the Body Shape Calculator.

Sources

• MedlinePlus, U.S. National Library of Medicine: Calculating body frame size (wrist-by-height chart).
• Heath BH, Carter JE (1967), A modified somatotype method, American Journal of Physical Anthropology: PubMed 6049820.
• Campa F et al. (2020), Heath-Carter somatotype assessment in elite soccer players (ten body dimensions, 13 categories), Sports (Basel): PubMed 33121135.
• Martínez-Mireles X et al. (2025), A national study of somatotypes in Mexican athletes across 43 sports (Heath-Carter equations in Appendix A), Journal of Functional Morphology and Kinesiology: PubMed 40981028.
• Sterkowicz-Przybycień K et al. (2019), Somatotype, body composition, and physical fitness in artistic gymnasts, PLoS One: PubMed 30721273.
• Vertinsky P (2007), Physique as destiny: William H. Sheldon, Barbara Honeyman Heath and the struggle for hegemony in the science of somatotyping: PubMed 18447308.
• Browning LM, Hsieh SD, Ashwell M (2010), waist-to-height ratio and the 0.5 boundary: PubMed 20819243.
• Mifflin MD, St Jeor ST et al. (1990), predictive equation for resting energy expenditure: PubMed 2305711; U.S. Departments of Agriculture and Health and Human Services: Dietary Guidelines for Americans, 2025-2030.