How to measure your bra size

Bra sizes have 2 measurements:

  1. The band/underbust (rib cage)
  2. The cup (bust)

It’s a common misconception that cup size represents breast size. Rather, cup size represents the difference between the ribcage and the bust. We also know that different brands will have different measuring methods and sizing. This can make sizing even more confusing. Follow this guide to determine your size.

1. Band/Underbust Size

Measured numerically & refers to the size of the rib cage.

While braless or wearing a non-padded bra, use a measuring tape to measure around your torso directly under your bust (where a bra band would sit). The measuring tape should be horizontally level and sit firmly.

To determine your traditional bra band size, you can record this in inches and convert as following (or using the Bra Conversion guide below). For US/UK, round down to the nearest whole number.

Inches

26”

28”

30”

32”

34”

36”

38”

Size =

4

6

8

10

12

14

16

how to measure underbust

2. Cup Size

Measured alphabetically & refers to the breast size in relation to the rib cage (i.e. how much bigger the breasts are than the rib cage).

Wrap the measuring tape around the fullest part of your bust. To determine your traditional bra cup size, calculate the difference between the bust size and the underbust size in inches (bust size – underbust size = difference):

Difference in inches

0

1

2

3

4

5

6

7

8

Cup size =

AA

A

B

C

D

DD

E

F

G

how to measure bust

Sizing will vary across different brands depending on style and measuring methods. Our wireless designs offer more flexibility and a comfortable fit. 

Once you have determined your measurements, you can follow our Bra Conversion guide to help with your shopping. If you are in between sizes, you can choose to size up for a relaxed fit or size down for a cheeky cut fit.

Bra conversion

P.s. View our full Size Guide HERE.

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