The bust measurement in conjunction with the underbust measurement is used to calculate a cup size. If all your measurements point to the same size then the Size Calculator recommends that size, if you have measurements which span two sizes then the Size Calculator suggests that you are in between two sizes and the recommended size is derived by looking at the two measurements which are pointing to the same size. This means that if you are in between sizes, depending on your measurements, sometimes the smaller size is recommended and sometimes the larger. Absolut Beach recommends that before deciding you have a think about how you intend to use the swimwear. If you are going to use your swimwear for sporting purposes like boogie boarding, surfing, swimming, wind surfing etc.
Larger sizes are good for sunbathing and general beach and pool usage where comfort is important.
Cups are relative to style sizes so cups gets bigger as sizes increases. Most Absolut Beach styles are generic but some bikini tops can be selected on how much attention you expect to get on the beach. This is especially true if you are in between two sizes. .