How to Calculate Your Bra Size?

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what is my cup size calculator

Mainly it would help if you made sure the bra fits comfortably. According to the organization Kids Health, it will not affect breast tissue growth if the size is large or small, but it will lead to discomfort during the day. To ensure that your bra fits properly, follow the proper bra fitting guide below-

How to Measure Bra Size with Hands:

Step 1: Measure Your Band Size

how big is 34b bra size

Firstly, Stand straight and measure around your rib cage, just under your bust. Ensure that the tape is comfortably tight but not overly so. And round to the nearest whole number, #1.

Step 2: Measure Your Bust Size

34c bra size in inch

Secondly, Stand in front of the mirror in a non-padded bra. Enclose the tape measure around your back, under your arms, and the whole part of your bust. Make sure the tape is snug against your skin and level around, round to the nearest whole number #2.

Step 3: Calculate Your Cup Size

34 b bra size in cm

Cup sizes are calculated between your band size and the fullest part of your boobs (the measurements you just took). Check it out:

0″ = AA

1″ = A

2″ = B

3″ = C

4″ = D

5″ = DD


For example, if your band measures 30″ and the entire point of your bust measures 32″, there is a difference of 2″ Inch. This means you are a B cup.

Step 4: Finalize Your Band Size

To find your band size, take measurement step #1 – rib cage and add another 4 to it. For example, a 30 would be a band size of 34. Add them together and the sample bra size is a 34B. This is how you find out your bra size.


1 Inch = 2.54 CM (Multiply the length value by 2.54)

Bra Cup Size Chart with Pictures:

Look up your calculated bra size in Inch-

Deduct your band size from your bust size. Each inch of difference corresponds to a bra cup size. For example, a 1-inch difference is an A cup, a 2-inch difference is a B cup, and so on.

average bra size us by age

Look up your calculated bra size in CM-

breast size chart by age

Bra sizing international-

international bra sizes

A bra that fits shape guide-

The right bra will make you feel supported without the pain. According to an expert, there are five specific areas you can always check to make sure your bra fits properly

1) Your Band 2) Straps 3) Cups 4) Underwire and 5) Center gore

what is my cup size calculator

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