Hello, I currently wear a 32C although I've never been measured - guilty!
I've just taken my measurements and am having a bit of confusion with my overbust, not to mention the fact all these calculators are giving me different sizes! A few keep saying I'm a 30 band despite me inputting that my underbust is 28in 
Underbust - 28in
Bust - 31.5in (so is that 31 or 32?)
Above bust - 30in
Thank you everyone 