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.
DD or DDD is the average cup size in the US, so C is viewed as smaller. A C cup, however, is considered large in Japan, since the average cup size is an A.
For instance, a 34A means that your boobs are an A cup and that your bra is 34 inches around. Example: 37 inches (bust) – 34 inches (band) = 3 inches. That's a 34C. Q5. What is the difference between cup size & bra size?
With standard sizing, you can expect a 32C and a 32D to be bracketed together as a Small, a 34C and a 34D to both be Medium, a 36C and 36D to equate a Large, and so on, up through the fit range.
The biggest bra cup size, or the most widely available one, is a K cup, but obviously it's possible to be bigger than this. If you're measuring bigger than a K, it's most likely that you'll have to get your bras made by a specialist place.
To determine the cup size:
Example: if your ribcage measurement is 31, and your bust measurement is 37, your bra size is a 34C: 31+3=34, so 34 is your band size. Since 37-34= 3, you've got a C cup.
You'll also notice physical changes in your breasts. Estrogen keeps the connective tissue of your breasts hydrated and elastic. In the hormone's absence, the breasts shrink because the ducts and mammary glands shrink, and the breasts become less firm and lose their shape.
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.
When people talk about breast size, they often describe it in terms of bra size. The average bra size in the United States is 34DD.
A 32C is one cup size smaller than a 34C. That also means a 34 is two cup sizes bigger than a 30C, and so on.
The only difference is the band size. The 34 is a bigger band size than a 32. Another example, a 34B and 36A are the same cup size.
For some reason, we have been brainwashed into thinking that boob sizes go from A-DD, DD being the biggest boob/bra size. DD is actually at the lower end of the scale, there is still E, F, FF, G, GG, H, HH, J, JJ, and K cup above that.
Is D or DD cup bigger? 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 breast measurement 5 inches larger than the band size is a DD and a breast measurement 6 inches larger than the band size is a DDD.