Bra Size Calculator

Result

LocationSizeCup
US/CAband too small to have size!P
UKband too small to have size!KK
US/CA (Underbust +4)*band too small to have size!P
UK (Underbust +4)*band too small to have size!KK
EU (EN 13402)band too small to have size!T
FR/BE/ESband too small to have size!T
Australia/New Zealandband too small to have size!O

The calculation result is only a starting point. A professional fitting or trying on bras to see which sizes work best is recommended.

* few manufacturers use the underbust +4 method which adds four or five inches to the band size.

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 betweem different locations.

Location
Size
Cup

Incorrect bra fit

Surveys and studies often cite that anywhere between 70-85% of women wear incorrectly fitted bras. While data collection methods between various sources is not consistent and these percentages may be inflated, incorrectly fitted bras are nonetheless a significant issue, evidenced by the number of studies, articles, and complaints surrounding the issues women face due to a lack of size standardization. Studies have revealed that the most common mistake made by women when selecting a bra was to choose too large a back band and too small a cup. Part of the issue is lack of standardization regarding band and cup sizes. These vary largely between countries, and even manufacturers, making it difficult to use these measures as anything more than an approximate fit. A 34B bra from two different companies for example, may not fit the same person because of this lack of standardization.

Some signs of incorrectly fitted bras include the band digging into the torso or sliding upwards, red marks, shoulder or neck pain, the breasts overflowing around the edges of the bra, and the bra's center panel not lying flat against the breast, among others.


Bra size

The two major aspects of bra size are the band size and the cup size.

Band size (frame size)

The band size is the size of the bra band around the torso. However, band sizes come in different measurements in different countries, in that sizes such as small, medium, and large, equate to different measurements. Refer to the table below for some size measurements, though some variation from the published measurements is possible.

Band SizeFR/BE/ESEU (Standard EN 13402)US and UKAU, NZ
XXS7560286
XS8065308
S85703210
M90753412
L95803614
XL100853816
XXL105904018
3XL110954220
4XL1151004422
5XL1201054624

Cup size

The cup size can be calculated using the difference between bust size and band size. Refer to the table below.

Bust/band difference in inchesUS cup sizeUK/AU cup size
<1AAAA
1AA
2BB
3CC
4DD
5E or DDDD
6F or DDDE
7G or DDDDF
8HFF
9IG
10JGG
11KH
12LHH
13MJ
14NJJ


Bust/band difference in cmContinental Europe cup size
10-11AA
12-13A
14-15B
16-17C
18-19D
20-21E
22-23F
24-25G
26-27H
28-29I
30-31J
32-33K