Frame Size Calculator
Use the Frame Size Calculator to estimate your body frame type — small, medium, or large — based on your wrist circumference and height. This quick assessment helps tailor ideal weight ranges and health recommendations to your bone structure. Commonly used in medical and nutritional evaluations.
Determine Body Frame Size by Wrist and Height
Wrist-to-Height Ratio Frame Size Classification
\[
\text{For women:} \\
\text{Frame Size} =
\begin{cases}
\text{Small} & \text{if } \text{Height (cm)} > 165 \text{ and } \text{Wrist} < 15.2 \text{ cm} \\
\text{Medium} & \text{if } \text{Wrist} = 15.2–15.9 \text{ cm} \\
\text{Large} & \text{if } \text{Wrist} > 15.9 \text{ cm}
\end{cases} \\[1em]
\text{For women:} \\
\text{Frame Size} =
\begin{cases}
\text{Small} & \text{if } \text{Wrist} < 16.5 \text{ cm} \\
\text{Medium} & \text{if } \text{Wrist} = 16.5–19.0 \text{ cm} \\
\text{Large} & \text{if } \text{Wrist} > 19.0 \text{ cm}
\end{cases}\\[1em]
\text{Alternatively, use:} \\
\text{Index} = \frac{\text{Height (cm)}}{\text{Wrist Circumference (cm)}}
\]
Interpretation (for both genders):
- Index > 10.4 → Small frame
- Index 9.6–10.4 → Medium frame
- Index < 9.6 → Large frame
Frame Size – Calculation Example
Example 1:
- Gender: Female
- Height: 168 cm
- Wrist circumference: 15.5 cm
$$\text{Index} = \frac{168}{15.5} ≈ 10.84$$
Since index > 10.4 → Small frame
Frame size reflects the bone structure of the body and influences optimal weight and body composition. People with larger frames tend to weigh more naturally, even at healthy levels of body fat.
Knowing your frame size helps in:
- Setting more accurate ideal weight ranges
- Adjusting fitness and nutrition plans
- Medical assessments, especially in BMI limitations
This method is non-invasive and requires only a measuring tape.