Body Frame Size Calculator
Classify your body frame size as small, medium, or large using the standard height-to-wrist-circumference ratio method.
Gender
Unit
cm
cm
Body Frame Size
Height-to-wrist ratio: 10.65
For general information only, not medical advice. Talk to a doctor before making health decisions based on this result. Terms
How to Use the Body Frame Size Calculator
Enter your height and wrist circumference, and select your gender. This calculator uses the standard height-to-wrist ratio method — dividing your height by your wrist circumference (both in the same unit) — to classify your body frame as small, medium, or large. Frame size is commonly used alongside height and weight to refine ideal-weight and body-composition estimates, since a larger skeletal frame naturally carries more healthy weight than a smaller one at the same height.
The Ratio Thresholds
Men — Small: ratio > 10.4 · Medium: 9.6–10.4 · Large: ratio < 9.6
A higher ratio means your wrist is relatively small compared to your height, indicating a smaller skeletal frame; a lower ratio means a proportionally thicker wrist and a larger frame.
Example
A woman who is 165 cm tall with a 15.5 cm wrist has a ratio of 165 ÷ 15.5 ≈ 10.6, which falls in the Medium frame category (between 9.9 and 10.9).
Common Use Cases
- Refining an ideal-weight estimate by accounting for skeletal frame size.
- Understanding why two people of the same height can have very different healthy weight ranges.
- General fitness and body-composition awareness alongside BMI or body-fat measurements.
FAQs
How do I measure my wrist circumference?
Wrap a soft measuring tape around your wrist just below the wrist bone (where a watch would sit) and note the circumference in centimeters or inches, keeping the tape snug but not tight.
Is there a wrist-only method that doesn't need height?
Yes — some charts classify frame size from wrist circumference alone using fixed height-based ranges (for example, for women over 5'5", under 6 inches is small, 6-6.25 inches is medium, and over 6.25 inches is large). This calculator uses the more precise height-to-wrist ratio method instead, which adjusts continuously for your exact height rather than a fixed height bracket.
Is this a medical measurement?
No — body frame size is a general fitness reference, not a diagnostic or medical measurement. It's best used as one input alongside other health metrics, not as a standalone health assessment.