Band sizes (the number) go from 28 up to around 56 in even numbers, and cup sizes (the letter) go from AA to K. The cup size is completely separate from the band size, so any combination of band and cup is possible. Cup sizes are in proportion to the band, so for example a 34C is one size bigger than a 32C.
UK cup sizes:
AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K.
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