Bra Size Calculator FREE

Discover your perfect fit with our sister Bra Size Calculator! Learn how to measure, calculate, and find the right bra size and cup size effortlessly. Feel confident and comfortable every day!

Bra Size Calculator

Bra Cup Size Calculator

Band Size Calculator

How to Measure Your Band Size

StepDescription
1. Measure UnderbustStand up straight and relax. Wrap the measuring tape snugly around your ribcage, just under your bust. Make sure it is parallel to the ground and not too tight. Record the measurement in inches.
2. Calculate Band SizeIf your underbust measurement is an even number, this is your band size. If it’s an odd number, round up to the nearest even number. For example, if your measurement is 31 inches, your band size would be 32 inches.
3. Verify MeasurementEnsure the tape is level and the band fits snugly but comfortably. If you’re unsure, measure again or consult a professional fitter for accurate results.

How to Determine Your Cup Size

StepDescription
1. Measure UnderbustWrap the measuring tape around your ribcage, just under your bust. Record this measurement in inches. This is your band size.
2. Measure BustWrap the measuring tape around the fullest part of your bust. Record this measurement in inches.
3. Calculate Cup SizeSubtract your band size from your bust measurement. Use the difference to determine your cup size using the provided scale.

Cup Size Scale

Difference (in inches)Cup Size
1A
2B
3C
4D
5DD/E
6DDD/F
7G

What is sister bra size?

The term “sister bra size” means if you wear a bra and you do can not get that size then you will look for similarly to your current size but with a different band and cup combination.

For example:

  • If you go from 34C to 36B, the cup volume stays the same.
  • If you go from 34C to 32D, the cup volume stays the same.

Bust Size Comparison

Bust Minus Band (inches)US Cup SizesEuropean Cup SizesUK Cup Sizes
Less than 1″AAAAAA
1″AAA
2″BBB
3″CCC
4″DDD
5″DD/EEDD
6″DDD/FFE
7″DDDD/GGF
8″HHFF
9″IIG
10″JJGG
11″KKH
12″LLHH
13″MMJ
14″NNJJ
15″OOK

US vs European Cup Sizes

US Cup SizesEuropean Cup Sizes
AAAA
AA
BB
CC
DD
DD/EE
DDD/FF
DDDD/GG
HH
II
JJ
KK
LL
MM
NN
OO

US vs UK Cup Sizes

US Cup SizesUK Cup Sizes
AAAA
AA
BB
CC
DD
DD/EDD
DDD/FE
DDDD/GF
HFF
IG
JGG
KH
LHH
MJ
NJJ
OK

How to calculate bra size?

First of you have to Measure Your Band Size then Measure Your Bust Size and at last Calculate Your Cup Size. For example if you have Band Size 34 inches and Bust Measurement 37 inches then Bust minus Band as 37-34=3 which means your cup size is C, and your bra size is 34C.

How to calculate bra cup size?

Bust minus Band as 37-34=3 which means your cup size is C, and your bra size is 34C. The cup sizes based on the difference and here is the list to check 1 inch = A cup, 2 inches = B cup, 3 inches = C cup, 4 inches = D cup, 5 inches = DD/E cup, 6 inches = DDD/F cup and so on.

How to measure bra size calculator?

If you want to measure bra size with calculator then you must need your Bust Size and Band size. Just put the data in Bra Size Calculator then it will show you your bra size.

How do you calculate bra size?

To calculate your bra size you need to measure the Bust size and then Band size. When you got Bust and Band size then minus the Band from Bust size the difference will give you cup size. 1 inch is A cup, 2 inch is B cup, 3 inch is C cup and so on.

How is bra size calculator?

Bra size calculator is an easy tool to calculate your bra size. You just need to provide your bust and band size. it calculates the actual size for your bra. You can get your accurate bra size by using it.