Body Type Calculator
Enter valid height and wrist measurements.
This uses the height-to-wrist-circumference ratio method (sometimes called the Wilson frame size method), a measurable way to classify bone structure — small, medium, or large frame. "Body type" quizzes based on self-reported body shape (ectomorph/mesomorph/endomorph) aren't based on a validated formula, which is why this tool uses an actual measurement instead.
Free body frame size calculator using an actual measurement (height-to-wrist ratio) instead of a self-reported body type quiz — small, medium, or large frame, based on bone structure.
How it works
- Enter your sex, height, and wrist circumference
- See your body frame size classification and the underlying ratio
Frequently asked questions
Why not use ectomorph/mesomorph/endomorph categories?
Those 'somatotype' categories aren't based on a validated measurement formula — most online versions are self-reported quizzes, not calculators. This tool uses an actual measurable ratio (height to wrist circumference) instead.
What is frame size used for?
It's sometimes used alongside height and weight to interpret 'ideal weight' ranges — a larger frame can reasonably carry more weight at the same height than a smaller frame, which pure height/weight charts don't capture.
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From the blog
Update history
- 2026-09-03 Height and wrist are now sliders instead of number fields, and the sex toggle shows an icon for each option.
- 2026-09-01 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
- 2026-09-01 Launched: body frame size calculator using the height-to-wrist-circumference ratio method, in place of unvalidated self-reported somatotype quizzes. Entirely client-side.