Body Frame Size Calculator

Created by Mariamy Chrdileli
Reviewed by Anna Szczepanek, PhD and Steven Wooding
Last updated: Feb 02, 2023

Welcome to the Omni body frame size calculator, a convenient tool that will help you determine your body frame size with simple inputs such as gender, height, and wrist circumference. Grab a measurement tape and come along to find out what the body frame size is, how to calculate your body frame size, measure your wrist circumference, and more!

What is body frame size?

Body frame size is often used as the informal definition of body composition that adjusts for skeletal mass. Since a lot of bodyweight prescriptions such as body mass index (BMI) do not account for body fat levels, body frame size calculation can be a valuable determinant of the physique. Indeed, studies show that body frame size is associated with body fat and fat-free mass.

Your body frame size index can be small, medium, or large. Although note that the index is likely not associated with the density or the strength of your bones. Keep reading to learn how to measure your body frame size!

If you're interested in calculating body mass index or fat-free mass index, visit Omni BMI calculator and fat-free mass index calculator accordingly.

How do I measure my body frame size?

To calculate the body frame size, first, you should measure the circumference of your wrist and your height. The utilization of wrist size in determining body frame is common since wrists are primarily free from body fat and muscle. To measure your wrist circumference:

  1. Grab a flexible but non-stretchable measuring tape preferably 0.7 cm or 0.3 inches wide.
  2. Wrap the measuring tape around the circumference of your wrist, just above the knobby bone, until it overlaps.
  3. Record the difference between the zero end of the tape and the remaining tape.

After measuring your wrist size and height, you can calculate your body frame size index by using a simple formula:

Body frame size = Height / Wrist circumference

Where both wrist circumference and height are given in inches.

You can check which category your body frame index fits in using the separate tables for men and women below.

For men:

Body frame index

Body frame size

r > 10.4

Small frame

r = 9.6-10.4

Medium frame

r < 9.6

Large frame

For women:

Body frame index

Body frame size

r > 11

Small frame

r = 10.1-11.0

Medium frame

r < 10.1

Large frame

Sounds cumbersome? Don't worry; our calculator will do the work for you! 👩‍🏫 If you're interested in calculating body fat percentage, skinfold body fat calculator is a convenient and informative tool to learn how to calculate your body fat using a skinfold caliper!

How does the body frame calculator work?

Using the body frame calculator is quite simple! Indicate your gender, height, and wrist circumference, and the calculator will determine your body frame size index and which body frame size category you fit in.

When entering your measurements, don't forget to change measurement units at your convenience! 📏


What is considered medium body frame?

The following measurements below are considered as medium body frame size.



Wrist size

Under 5′2′′

5.5 to 5.75′′


6 to 6.26′′

Over 5′5′′

6.26 to 6.4′′



Wrist size

5′5′′ or taller

6.5 to 7.5′′

Is there an ideal weight and body frame size?

There is no accurate way to define ideal weight or body frame size since everyone's body composition is different. For instance, highly muscular individuals may have a high body mass index since muscle is denser than fat and takes up less space. However, a muscular body does not pose a health risk.

Is body frame size related to BMI?

Body frame size is often consistent with BMI. However, keep in mind that even if your BMI falls within a normal range and you have high body fat levels, you may still be at risk of developing diseases like type 2 diabetes, artery disease, heart disease, and some cancers.

What's my body frame size if I am 6 feet tall and have a wrist circumference of 5.5 inches?

To know your body frame size, you should:

  1. Convert your height into inches; 6 feet is 72 inches.
  2. Divide your height measurement in inches by your wrist circumference measurement; the result should be 13.
  3. That's all! A body frame size index of 13, in men and women, indicates a small body frame.
Mariamy Chrdileli
Wrist circumference
Body frame size index
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