If you've been in a store and heard the fitter refer to a “double D” bra size, that's what a “DD” size is – we just say “double” instead of repeating the letter when we describe the sizing out loud. The same applies to any other double lettering for different sizes, like FF (double F) or GG (double G).
Calculate Your Bra Size
For example, if your bust measurement is 34" minus your band measurement of 29" = 5". This 5" difference is a DD cup.
There is a difference of between 2cm and 2.54cm (depending on where you shop) between each cup size, so an AA is an inch smaller than A and DD is an inch bigger than D.
It's because when bra sizing was first developed, the only cup sizes that were available were A, B, C and D. However, when it was discovered that Women's breast actually came both bigger and smaller than this then they needed to add a size either side of this scale. Hence the DD and AA.
That number represents your cup size. For less than one inch you are a AA cup, for one inch you are an A cup, for two inches you are a B cup, for three inches you are C cup, for four inches you are a D cup and for five inches you are a DD cup.
Simply put, the difference between a D cup and a DD cup is that; a D cup is larger than an A, B or C cup and slightly smaller than an E cup. On the other hand, a DD cup is slightly larger than an E cup, yet still smaller than an F cup.
There's no difference in the spacing between single and double letter sizes, a DD is one full size larger than D, just like E is one full size larger than DD.
A DD cup will fit bigger than a D cup. If your breast tissue is overflowing out of a D cup or you're noticing a gap in your DDD/E bra cups, you might want to try a DD cup. Remember: A US DD and a UK DD cup should fit the relatively the same.
All you need to do is a little bra math: Subtract your band size from your bust measurement to find your cup size. “The difference in inches corresponds to your cup size,” says Iserlis. For example, if your bust measures 37 inches, and your band size is 34, the difference will be 3.
The difference is truly in the name… DD or DDD are the US standard; E and F are used more internationally. As our range continues with a G cup, for example, we'll call it just that, a “G.”
A: Thank you for contacting Chantelle. A 34E is the same as 34DD US. Helpful?
What's The Average Breast Size In The U.S.? While it's really difficult to precisely determine the standard breast size in the U.S. (or anywhere in the world, for that matter), wedo know that the average breast size in America is a 34DD.
Proper cup fit is influenced by band size. As the band size changes, so does the cup size. For every band size you go down, you should go up one cup. If you are in a 34D with a good cup fit, but want to go down to a 32 band, you would go to a 32DD for a tighter band with the same cup fit.
There is a vast spectrum of different sizes and shapes. In fact, the Guinness World Record for largest natural breasts belongs to New York native Annie Hawkins-Turner. Her chest-over-nipple measurement is 70 inches!
A full-cup bra is a bra perfectly suited to D cups and large busts. It has wide straps and ensures optimal support. This piece of lingerie is also very comfortable: it envelops the entire breast and exerts no pressure on it. Therefore, full-cup bras are suitable for all types of chests.
Bralettes are offered in either XXS-XXL sizing. A few styles may also be offered in S-DD (32DD or 34DD), M-DD (36DD), or L-DD (38DD). Please reference our charts below to match your bra size to your bralette size. NOTE: Not all bra sizes will have an equivalent size in the XX-Small (XXS) to XX-Large (XXL).
In order to determine if your cup size is too big or small, look to see if you have an extra bump of breast tissue at the top or at the sides of the cups or if you have a wrinkle in the cups or extra space in the cup.
Go down a back size = go up a cup size. e.g. a 36DD becomes a 34E. If you go up a back size but stay the same cup size, you'll notice extra room in the cup.
In the United States cup sizes range from A to N. The cup sizes get larger as the letters go up in the alphabet. Size D is bigger than A, and H is bigger than D. Sizes are as follows: AAA, AA, A, B, C, D, DD, F, G, H, I, J, K, L, M, and N.
Bra Cup Sizes
The further down the alphabet a letter is, the larger the cup volume, starting with AA as the smallest.
Globally, a natural female breast has an average size somewhere between a large "A" and a smaller "B" in the US size system. According to European or Australian classifications, this would be a "B".
If C cups are the midpoint or medium breast size indicator on the cup size scale, then D cups mark the transition towards larger breasts and DD cups are the exact opposite of A cups.
The answer is no. The idea that all cups of the same letter are the same size is a myth. Pretend you're a 34D. The “34” number is your band size.