Body Type Calculator

cm
cm
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About the Body Type Calculator

Your body frame size - small, medium, or large - is determined by bone structure and can help refine ideal weight and fitness targets beyond height and weight alone.

Formula Used

Frame Ratio = Height (cm) / Wrist Circumference (cm)

How It Works

This calculator divides your height by your wrist circumference to get a ratio, then compares it against standard frame-size thresholds for your gender.

Step by Step

  1. Measure your wrist circumference at its narrowest point.
  2. Divide your height in centimetres by your wrist measurement.
  3. Compare the ratio against the gender-specific frame-size thresholds.

Worked Example

Example: A man 175 cm tall with a 17 cm wrist:

Ratio = 175 / 17 = 10.3 → Medium Frame

Reference Table

Height/Wrist RatioMenWomen
Small Frame> 10.4> 11.0
Medium Frame9.6 - 10.410.1 - 11.0
Large Frame< 9.6< 10.1

Frequently Asked Questions

Where do I measure my wrist?

Measure around the narrowest point of your wrist, just below the wrist bone, using a soft measuring tape.

Does frame size change over time?

No, frame size is based on bone structure and stays fairly constant through adulthood, unlike weight or body fat.

Why does frame size matter for fitness?

A larger frame naturally supports more muscle and weight, so ideal weight targets are sometimes adjusted based on frame size.