Enter the chest and hip measurements into the calculator to determine the bathing suit size; this calculator can also evaluate the chest, hip, or waist measurements given the bathing suit size is known.

Bathing Suit Size Formula

The following formula is used to calculate the bathing suit size.

BS = (C * H) / W


  • BS is the bathing suit size
  • C is the chest measurement
  • H is the hip measurement
  • W is the waist measurement

To calculate the bathing suit size, multiply the chest measurement by the hip measurement, then divide the result by the waist measurement.

What is a Bathing Suit Size?

A bathing suit size refers to the measurement or dimensions of a swimsuit that corresponds to the body size and shape of the person who will wear it. It is typically determined by several factors including bust, waist, and hip measurements, and sometimes also includes considerations for torso length. Bathing suit sizes can vary greatly between different brands and countries, and they may be expressed in different ways, such as numerical sizes (e.g., 6, 8, 10), alpha sizes (e.g., S, M, L), or specific measurements (e.g., 34B, 36C). It’s important to note that a person’s regular clothing size may not necessarily be the same as their bathing suit size due to differences in fit and material stretch. Therefore, it’s often recommended to refer to a brand’s specific size chart when purchasing a new bathing suit.

How to Calculate Bathing Suit Size?

The following steps outline how to calculate the Bathing Suit Size.

  1. First, measure the bust size (in inches).
  2. Next, measure the waist size (in inches).
  3. Next, measure the hip size (in inches).
  4. Use the following formula to calculate the bathing suit size: Bust Size + Waist Size + Hip Size.
  5. Finally, determine the corresponding bathing suit size based on the calculated value.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Bust size (in inches) = 36

Waist size (in inches) = 28

Hip size (in inches) = 40