This is a simple estimation method, not a medical measurement of bone structure. Use it as general context, not a precise classification.
How it works
Measure your wrist at its narrowest point, just below the wrist bone.
We calculate the ratio of your height to your wrist circumference (in the same unit).
We compare it to standard thresholds, which differ by sex, to classify your frame as small, medium, or large.
A relatively thin wrist for your height suggests a smaller frame; a relatively thick wrist suggests a larger frame. It's a simple proxy, not a precise measurement of bone density or structure.
Frequently asked questions
By dividing your height by your wrist circumference (in the same unit) to get a ratio, then comparing that ratio to standard thresholds that differ for men and women. A higher ratio indicates a smaller frame.
Frame size adds context to ideal-weight charts, which are otherwise based on height alone. Someone with a larger frame will naturally and healthily weigh more than someone with a small frame at the same height.
Wrap a flexible tape measure around your wrist at the narrowest point, just below the wrist bone (where a watch would sit). Keep it snug but not tight.
No — it's a simple estimation method, not a medical measurement of actual bone structure or density. Use it as general context alongside other measurements.