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.
Is a 32D Bra Cup Size Small or Medium? A 32D is considered large because there's a four-inch difference between the bust and band measurements. D is also the largest among the standard bras sizes.
Generally, a 32C is considered a medium/average size. C cups are very common, while a 32 inch ribcage measurement is on the smaller side.
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.
A 34C and a 32D are actually the same size cup size. Do men know this? Do all women know this? A 34C and a 32D are known as "sister sizes" which means that the cup will fit the same amount of breast tissue and the same applies for their other "sister sizes" of a 36B, 38A, 32D, 30DD, 28E.
As the band size gets bigger, the volume increases. That means that a person wearing a 32D has smaller breasts than someone wearing a 38D, despite them both wearing a D cup bra. In fact, a 38D bra is about three cup sizes larger than a 32D bra.
A 32D has a bigger cup than a 32C. The width is supposed to be the same. Thus, depending on personal comfort, brand, or material, you may use 32C or 32D.
Generally, the A cup is considered the smallest available but for some this is still too big and compensating with a smaller band size won't help. If you want something that's going to fit your form you'll have to go down a level to an AA or even AAA cup.
Contrarily, 32B is smaller when compared to 32D, 36B, and 34B.
A 32D should reasonably stretch to 32 inches while a 34D should stretch to 34 inches. However, cup size is not static with band size. A 34D is a whole cup volume larger than a 32D, and is more equivalent to a 32DD.
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 average bra size in the United States is 34DD. This figure can vary by country. In the U.K., for example, the average is 36DD. But pinning down an exact figure for what's “normal” or “average” isn't as easy as you might think.
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.
Medium: 32C, 34B, 36A, 36B, 36C. Large: 32D, 34D, 36D, 38A, 38B, 38C.
A pair of D-cup breasts can weigh between 15 and 23 pounds, "the equivalent of carrying around a six-month old baby boy." This source also states that a pair of D-cup breasts weighs between 15 and 23 pounds.
D Cup - How Much Do Breasts Really Weigh? A D Cup breast weighs on average 760g, which is the equivalent of: 1 guinea pig per babybuffet - similar to the A cup chipmunks, we think we would prefer breasts to fuzzy little creatures.