Calculate belly size by subtracting hip circumference from waist circumference in inches, centimeters, millimeters, or feet instantly online.

Belly Size Calculator

Related Calculators

Belly Size Formula

The following formula is used to calculate belly size as the difference between waist circumference and hip circumference.

\mathrm{BS}=\mathrm{WC}-\mathrm{HC}

Variables:

  • BS is the belly size difference
  • WC is the waist circumference
  • HC is the hip circumference

To calculate belly size, subtract the hip circumference from the waist circumference. Both measurements must be expressed in the same unit before subtracting them.

What is Belly Size?

Belly size, as calculated here, is the difference between the circumference of the waist and the circumference of the hips. This measurement helps show whether the waist is smaller than, equal to, or larger than the hips.

A negative belly size result means the hip circumference is larger than the waist circumference. A positive result means the waist circumference is larger than the hip circumference. This calculator is intended as a measurement tool and should not be used by itself to diagnose a health condition.

How to Calculate Belly Size

The following steps outline how to calculate belly size.

  1. First, measure the waist circumference using a flexible measuring tape.
  2. Next, measure the hip circumference around the widest part of the hips.
  3. Convert both measurements to the same unit, if necessary.
  4. Use the formula BS = WC − HC to calculate belly size.
  5. Use the calculator above to verify the result in inches, centimeters, millimeters, or feet.

Example Problem: 

Use the following variables as an example problem to calculate belly size.

Waist circumference (WC) = 36 in

Hip circumference (HC) = 40 in

Belly Size (BS) = WC − HC = 36 − 40 = -4 in

In this example, the belly size is -4 inches, meaning the hip circumference is 4 inches larger than the waist circumference.