its depends, some have a B Size even a C size. you can always go to a store and pick some out and try them on in the dressing room to figure out which size you have. I wouldn't really worry though since you have so many options available to you for bras, there are so many different kinds of them, also I would check at walmart even k mart if you have one where u live, they usually sell bras under $25 I have one that I got for $8 at walmart.