Body Frame Size Calculator
Find out if you have a small, medium or large body frame from your wrist circumference and height, free in your browser.
Enter Values
How to use this calculator
- Enter your height and wrist circumference in cm.
- Read the ratio and frame size.
How it works
Divide height by wrist circumference. A higher ratio indicates a smaller frame; thresholds are approximate.
Worked example
180 cm height, 17 cm wrist. Ratio 10.6 → small frame.
Common mistakes
- Treating it as exact — thresholds vary by sex and source, so it's a rough guide.
- Measuring the wrist over the wrist bone rather than just above it.
Frequently asked questions
How is body frame size measured?
Most commonly from the ratio of height to wrist circumference (or elbow breadth) — a smaller wrist for your height means a smaller frame.
Does frame size change my healthy weight?
A larger frame carries more bone and lean mass, so the healthy weight range shifts up slightly; it is a refinement, not a big swing.
Why does frame size matter?
It helps interpret 'ideal weight' ranges — a larger frame naturally carries more. This is a guide, not medical advice.
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Cite this tool
Zerdly. (2026). Body Frame Size Calculator. Retrieved from https://www.zerdly.com/tools/body-frame-size-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.