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

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

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.