Body Frame Size
A wrist measurement and your height — context that BMI alone doesn't give you.
How is body frame size estimated?
This method divides your height by your wrist circumference — a smaller wrist relative to height suggests a larger frame, and vice versa, since wrist size correlates reasonably well with overall bone structure. Frame size is useful context for weight and BMI: two people the same height can have quite different healthy weight ranges depending on how much bone and frame they're carrying, something a single BMI number can't distinguish. It's a simple estimate rather than a clinical measurement like elbow-breadth callipers, but a reasonable starting reference.
Frequently asked questions
How do I measure my wrist for frame size?
Wrap a tape measure snugly around your wrist, just below the wrist bone (where a watch would sit), and note the circumference in centimetres.
Why does frame size matter for weight goals?
Two people at the same height can have very different healthy weight ranges depending on bone structure — a large-framed person will naturally carry more weight at the same body fat level than a small-framed person, which is context BMI alone doesn't capture.
Is this method scientifically precise?
It's a simple, commonly used estimate rather than a precise clinical measurement (like elbow breadth callipers) — useful as general context, not a definitive classification.
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