Body Type Calculator
Estimate whether you lean ectomorph, mesomorph, or endomorph from your frame size and waist.
Example
A man who is 175 cm tall with a 17 cm wrist and 82 cm waist:
Height / wrist ratio = 175 / 17 = 10.3
-> below 10.4, so MEDIUM frame
Waist / height ratio = 82 / 175 = 0.47
-> not high, not low
Result: Mesomorph (medium frame, moderate waist)
How it works
Frame size comes from your height-to-wrist ratio, then waist-to-height ratio nudges the result toward endomorph. This is a rough estimate, not a clinical body-composition measurement.
Good to know
The Body Type Calculator estimates which of the three classic somatotypes you lean toward — ectomorph (lean, narrow frame), mesomorph (athletic, medium frame), or endomorph (broader, softer frame) — using just your sex, height, wrist circumference, and waist circumference. It's built for people curious about how their skeletal frame and current body composition map onto a familiar fitness vocabulary, without needing calipers, scans, or a gym appointment.
Reach for it when you're choosing a training or nutrition starting point and want a quick sense of your build, or simply want to see whether you're naturally small-, medium-, or large-framed. The result combines two signals: your height-to-wrist ratio sets your frame size, and your waist-to-height ratio then nudges the label. A higher height/wrist number means a smaller (thinner-boned) frame, while a lower number means a larger frame; a waist/height ratio at or above 0.52 pushes the result to endomorph, and below 0.43 leans it toward ectomorph.
To interpret the output, read the big somatotype label alongside the three stats shown. Blended labels like "Ecto-Mesomorph" or "Meso-Ectomorph" are normal — somatotype is a spectrum, and most people sit between two categories rather than landing squarely in one. The frame badge tells you the part of the result fixed by bone structure, while the waist/height ratio is the part that shifts with diet and training.
One practical tip: measure your wrist snugly just below the wrist bone and your waist at the narrowest point, in the same units you selected, since a small tape error changes the ratio and can flip a borderline result. This is a rough heuristic for general interest, not a clinical body-composition assessment, and it runs entirely in your browser.
Frequently asked questions
Why does the calculator use my wrist measurement?
Wrist circumference reflects bone structure and barely changes with fat or muscle, so the height-to-wrist ratio is a stable way to estimate your skeletal frame size, which is the foundation of somatotype.
Can my body type change over time?
Your underlying frame (bone structure) stays fixed, but your waist measurement can shift with diet and training, so the estimate may move toward or away from endomorph as your body composition changes.
Is my data uploaded anywhere?
No — this calculator runs entirely in your browser; nothing is uploaded.
Is this a substitute for medical advice?
No. These are educational estimates — consult a qualified health professional for medical decisions.
People also ask
What are the three body types and how do they differ?
Ectomorphs tend to be lean with a narrow, lighter-boned frame; mesomorphs typically have a medium, more muscular athletic build; and endomorphs carry a broader frame with more body mass around the midsection. Most people are a mix of two rather than a pure single type.
How accurate is estimating body type from wrist and waist measurements?
It is a rough heuristic that uses bone-frame size and current waist proportions as proxies, so it gives a general direction rather than a precise classification. Methods like DEXA scans or skinfold testing measure actual body composition far more accurately.
How do I measure my wrist circumference correctly?
Wrap a flexible tape around the smallest part of your wrist, just below the wrist bone toward the hand, keeping it snug but not tight. Use the same unit (cm or inches) you selected in the tool.
Why does the calculator ask for my sex?
Men and women have different typical height-to-wrist ratios for the same frame category, so the tool uses sex-specific thresholds to classify small, medium, or large frames more fairly.
Is waist-to-height ratio a meaningful health measure?
Waist-to-height ratio is often discussed as a simple indicator of central body fat, and many references treat a value around 0.5 or higher as worth attention. In this tool it is used only to nudge the somatotype estimate, not as a health screen.
Can I change my body type with diet and exercise?
Your underlying bone frame does not change, but body composition factors such as muscle and waist size can shift with training and nutrition, which can move the estimate between categories over time. The skeletal-frame portion of the result stays fixed.
What does a blended result like Ecto-Mesomorph mean?
A hyphenated label means your measurements fall between two somatotypes, with the second word being the dominant tendency. It reflects that body type is a continuous spectrum rather than three rigid boxes.
Does this calculator store or send my measurements?
No. All calculations run locally in your browser, and the measurements you enter are not uploaded or saved anywhere.
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