How to Measure Your Body Frame Size (Wrist Method)

February 20, 2026

Frame size shifts your healthy weight target by roughly 7% up or down. The fastest, most repeatable way to estimate it is the wrist-wrap method, taught in nursing schools for decades.

The wrist-wrap test

Wrap the thumb and middle finger of your dominant hand around the wrist of your non-dominant hand, just below the wrist bone.

Overlap = small frame. Just touching = medium frame. No touch = large frame.

It's not perfect, but it correlates well with the wrist-circumference tables used in classical ideal-weight formulas.

What to do with the result

Small frame: aim for the lower end of your BMI 18.5–24.9 range.

Medium frame: aim for the middle.

Large frame: aim for the upper end. This is bone structure, not fat — larger frames genuinely weigh more at the same health.

Get your frame-adjusted target in one screen.

Frame Size Calculator →

Is BMI Accurate for Athletes?
BMI can label muscular athletes as overweight or obese. Here's when BMI misses the mark and what to use instead.
What's a Healthy Waist Size for Women?
The clearest waist guideline for women, based on the NHS and Ashwell Waist-to-Height ratio — no charts, just one rule.
How Much Should I Weigh for My Height and Age?
How age changes your healthy weight range, and the simple WHO/CDC formula that answers "how much should I weigh?".

How to Measure Your Body Frame Size (Wrist Method)

The wrist-wrap test

What to do with the result

Related articles