Enter your height and wrist circumference to estimate your body frame size, small, medium or large, using the standard height-to-wrist ratio method.
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This calculator divides your height by your wrist circumference, both in centimeters, to get a ratio. That ratio is compared against standard thresholds that differ for men and women, a higher ratio (a comparatively thinner wrist for your height) indicates a smaller frame, while a lower ratio indicates a larger frame.
For example, a man 175 cm tall with a 16 cm wrist has a height-to-wrist ratio of 175 ÷ 16 ≈ 10.94, which classifies as a 'Small' frame under the male thresholds used here (a higher ratio meaning a comparatively thinner wrist relative to height).
Frame size is sometimes used alongside height-and-weight charts to adjust a healthy weight range up or down, since two people of the same height can have naturally different bone structures. It's a rough classification, not a precise measurement of body composition.
Measuring wrist circumference over a watch, bracelet, or bulky sleeve, which inflates the measurement and can shift the result toward a larger frame size than accurate.
Treating frame size as a fitness or health indicator on its own, it's a bone-structure reference used alongside other tools, not a measure of body composition or fitness.
Expecting frame size to change with weight loss or gain, since it reflects bone structure rather than muscle or fat, it stays essentially fixed in adulthood regardless of body composition changes.
Wrap a flexible tape measure snugly around your wrist, just below the wrist bone, and record the measurement in centimeters.
No, frame size is based on bone structure, which is essentially fixed in adulthood, unlike weight or body fat percentage, which can change.
It's related but simpler, this calculator classifies bone frame size specifically, while somatotype classification more broadly describes body shape and composition tendencies.
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