Bra Size Calculator - type in your measurements to get your band and cup size. Quote from the website: "Don't be alarmed if this size is different from what you are used to, most women are wearing the wrong size bra! Your recommended bra size is a great starting point to finding bras that will fit you perfectly. The best size for you may vary based on the bra brand, style or other factors."
Ladies, this is a MUST READ. Turns out I've been wearing the wrong bra size most of my life, and odds are you have, too! "Everything You Never Knew You Needed To Know About Bras" Seriously, I was off by 2 cup sizes... I am so much more comfortable!!!