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Current culture would tell you that the most popular breast size is a C cup, as it falls right in the middle of smaller A and B cups and larger D and DD cups. However, a study done in the United States actually determined that the DD was the most common breast cup size.
The C cup size is considered the most coveted bra size, since it is big enough to impart some curves, yet still remains manageable. In fact, a large percentage of actresses have the C cup size with one of the small band sizes.
Let’s do another bra cup size comparison: if you wear a 32D, you are actually a true C cup. An easy way to determine your true cup size is simply to locate your bra size on the chart below and see which cup letter is paired with a 34 band in your row.
Comparing Cup Sizes: B vs. C Cup. Moving up the alphabet, B cup sizes transition into C cup sizes with a three-inch difference between bust and band measurements. C cups offer even more coverage and support, making them suitable for those with medium-sized busts.
For example, if your bust measures 37 inches, and your band size is 34, the difference will be 3. On the chart below, you'll see a 3 is equal to a C cup, meaning your bra size is 34C.
Subtract your calculated band size (Step 1) from your bust measurement (Step 2) and refer to the bra cup size chart here. Your bra size is your band size with your cup size. Example: 37 inches (bust) – 34 inches (band) = 3 inches. That's a 34C.
Typically spans from 28 to 56, with most manufacturers focusing on the 32 to 42 range. There’s a trend towards inclusivity, with more sizes being added. Bra band sizes in the USA are in even numbers only (e.g., 32, 34, 36), meaning you won’t find odd-numbered band sizes like 33 or 45.
As we move to the next cup size, B cups transition into C cups, which feature a three-inch difference between bust and band measurements. C cups provide increased coverage and support, making them ideal for those with medium-sized busts.
Learn about the right band size, the right bust size, calculating the US cup size, when you are plus size, and much more in the best US Bra sizes Chart. All about the search for your first bra or your daughter’s bra? explore them in our Bra Sizing category.
34 is considered the baseline or “true cup” size, therefore cup volume is based off of the difference between this under bust measurement and that of ones chest. Taking a 34B for example and going down a band size to a 32, would require going up to a C cup, conversely, going up a band size to a 36 would require going down to an A cup.