Welcome to the Omni Body Frame Size Calculator, a user-friendly tool designed to help you determine your body frame size using straightforward inputs such as gender, height, and wrist circumference. Grab a measuring tape and let’s delve into understanding body frame size, the calculation process, measuring wrist circumference, and more!

What is Body Frame Size?

Body frame size is an informal measure of body composition that adjusts for skeletal mass. Unlike metrics such as BMI, which may not account for body fat levels, body frame size considers the relationship between height and wrist circumference, providing insights into physique. Research indicates that body frame size is associated with both body fat and fat-free mass.

Your body frame size index can be categorized as small, medium, or large. It’s important to note that this index is not indicative of bone density or strength. Read on to discover how to measure your body frame size!

If you’re interested in calculating BMI or fat-free mass index, visit the Omni BMI calculator and fat-free mass index calculator respectively.

How to Measure Body Frame Size:

To calculate your body frame size, start by measuring the circumference of your wrist and noting your height. Wrist size is commonly used as wrists are typically devoid of body fat and muscle. Here’s how to measure your wrist circumference:

  1. Use a flexible, non-stretchable measuring tape (preferably 0.7 cm or 0.3 inches wide).
  2. Wrap the tape around 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 obtaining your wrist size and height, calculate your body frame size index using the formula:

Body Frame Size = Height / Wrist Circumference

Ensure both wrist circumference and height are in inches. Check the corresponding tables for men and women to determine your body frame size category.

For Men:

Body Frame IndexBody Frame Size
r > 10.4Small Frame
9.6 <= r <= 10.4Medium Frame
r < 9.6Large Frame

For Women:

Body Frame IndexBody Frame Size
r > 11Small Frame
10.1 <= r <= 11Medium Frame
r < 10.1Large Frame

Feeling overwhelmed? Fret not! Our calculator will simplify the process for you! 👩‍🏫 If you’re keen on calculating body fat percentage, the skinfold body fat calculator is a handy tool using skinfold calipers!

How the Body Frame Calculator Works:

Using the body frame calculator is a breeze! Input your gender, height, and wrist circumference, and let the calculator determine your body frame size index and category. Don’t forget to adjust measurement units as per your convenience! 📏


What is Considered a Medium Body Frame?

For women:

  • Height
    • Under 5′2′′: Wrist size 5.5 to 5.75′′
    • 5′2′′-5′5′′: Wrist size 6 to 6.26′′
    • Over 5′5′′: Wrist size 6.26 to 6.4′′

For men:

  • Height
    • 5′5′′ or taller: Wrist size 6.5 to 7.5′′

Is There an Ideal Weight and Body Frame Size?

There’s no precise way to define an ideal weight or body frame size as body composition varies. Highly muscular individuals may have a high BMI due to dense muscle. However, a muscular body doesn’t necessarily indicate health risks.

Is Body Frame Size Related to BMI?

Body frame size often aligns with BMI, but remember that a normal BMI doesn’t guarantee low body fat levels. Risks of diseases like type 2 diabetes and heart disease may still be present.

What’s My Body Frame Size if I’m 6 Feet Tall with a Wrist Circumference of 5.5 Inches?

To determine your body frame size:

  1. Convert your height to inches (6 feet = 72 inches).
  2. Divide your height in inches by your wrist circumference (result should be 13).
  3. A body frame size index of 13 indicates a small body frame for both men and women.