Bra Size Calculator

This tool calculates bra size using measurements of bust and frame size. For precise results, measure up to the closest ¼ inch or ½ cm. It's tailored for countries including the US, UK, EU, France, Belgium, Spain, Australia, and New Zealand.

Modifiy The Values And Click The Calculate Button To Use

Bust Size
Band Size
   bra size

The bust size is the loose circumference measured around the chest over the fullest part of the breasts, while standing straight with arms to the side, and wearing a properly fitted bra.

The band or frame size is the firm circumference, fitted not tightly, measured directly underneath the breasts.

Bra Size Converter

Use the following to convert the bra sizes between different locations.


Challenges with Bra Fitting A significant number of women, between 70-85% according to various surveys, wear bras that don't fit properly. The inconsistency in data collection may skew these figures, but the problem remains evident through countless studies, articles, and personal accounts. The major misstep women make is opting for a larger band size and a smaller cup. This confusion is aggravated by the lack of a universal standard for sizes, with variations across countries and manufacturers. For instance, a 34B bra from two brands might not offer the same fit due to this discrepancy.

Signs of a Poor Fit:

  • Band digging into the torso or riding up
  • Red marks on the skin
  • Neck or shoulder pain
  • Overflow of breasts from the bra
  • Center panel of the bra not sitting flat on the chest

Understanding Bra Size Bra size is a combination of two elements: band size and cup size.

Band Size (Frame Size): This represents the circumference of the bra band around one's torso. However, the same band size may have different dimensions in various countries. Even general sizes like small, medium, or large can differ. It's crucial to refer to specific size charts for accurate measurements, though slight deviations might occur.

Bra Size Calculator

Determining Cup Size

Cup size is determined by the difference between the bust measurement and the band size. See the provided table for details.

Bra Size Calculator 1

Bra Size Calculator 3

How to Calculate Bra size?

Measure under your bust for band size. Measure around the fullest part of your bust for cup size. Subtract band measurement from bust measurement to determine cup size.

How to Measure Bra size Calculator?

Measure under the bust for band size. Measure at the fullest part for bust size. Input into a bra size calculator for your fit.