Swimsuit Size Calculator by Omni

Enter your bust measurement in inches.
Enter your waist measurement in inches.
Enter your hips measurement in inches.

Swimsuit Size Conversion Chart

SizeBust (inches)Waist (inches)Hips (inches)US SizeUK SizeEU Size
XS31-3323-2533-350-24-632-34
S33-3525-2735-374-68-1036-38
M35-3727-2937-398-1012-1440-42
L37-3929-3139-4112-1416-1844-46
XL39-4131-3341-4316-1820-2248-50
XXL41-4333-3543-4520-2224-2652-54

How to figure out your swimsuit size?

The process of determining your swimsuit size may vary slightly depending on the brand and style, but here’s a general guide:

  1. Bust measurement: Measure around the fullest part of your bust while wearing a non-padded bra.
  2. Waist measurement: Measure around the narrowest part of your waist, typically just above the belly button.
  3. Hip measurement: Measure around the fullest part of your hips and buttocks.
  4. Torso measurement (for one-piece suits): Measure from the center of one shoulder, through the legs, and back up to the starting point.

Let’s say your measurements are:

  • Bust: 36 inches
  • Waist: 28 inches
  • Hips: 38 inches
  • Torso: 60 inches

Compare these measurements to the brand’s size chart.

If the chart shows:

Size Medium:

  • Bust: 35-37 inches
  • Waist: 27-29 inches
  • Hips: 37-39 inches
Your measurements would likely fit a Medium in this brand.
  • Style preferences: You might size up for a looser fit or down for a snugger fit.
  • Body shape: If your measurements fall across different sizes, choose based on the most important area for that particular style.
  • Brand variations: Sizes can vary between brands, so always check their specific size charts.

Bathing Suit Size Calculation Formula

You can use a point system to help determining bathing suit size decision:

Assign points based on where your measurements fall in the size chart:

  • 0 points if measurement is below the range
  • 1 point if it’s within the range
  • 2 points if it’s above the range

Sum the points for bust, waist, and hips.

Divide the total by 3 to get an average.

Round to the nearest whole number to determine your size:

  • 0 = Size down
  • 1 = This size
  • 2 = Size up

Using the Medium size from our previous example (35-37″ bust, 27-29″ waist, 37-39″ hips):

Your measurements:

  • Bust: 36″ (1 point – within range)
  • Waist: 28″ (1 point – within range)
  • Hips: 38″ (1 point – within range)
Calculation: (1 + 1 + 1) / 3 = 1

1 (rounded) suggests this size (Medium) is likely a good fit.

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