Quote:
Originally Posted by BettyBooty
OK, so my under-measure is 37 and across the fullest part of my chest is 42. I wear a 38D in molded cups. Although at Macy's they wanted to put me in 40C and it didn't work for me at all. I've tried on 38Cs also, and to be honest my boobs need a 38C in a soft cup bra or the cups pucker. The fit smoothly in a 38D molded when I am standing up.
According to that Polish bra calculator, I should be a 38DD. That would be too big for me.
That's why trying on bras is so important.

The shape of your breasts, their fullness etc can affect what size you need. My measurements are:
Bust: 39-40"
Underbust: 29"
That means a calculator would tell me that if my bust is 39" I'm between a: 28H/30GG and if it's 40": 28HH/30H (remembering that the volume of the cup in a 28HH=30H and ditto for 28H=30GG). However, in reality I need a 28HH because all 30's fit too large (I've tried various brands) and 28H's give me serious four boob. I imagine in some styles I even need to go up to a 28J.

However, if someone asks me to give a number I say 28HH but there's always the caveat that I need to try on bras first to know for sure in that brand and that particular style. Even though my bust has been measuring 39" there's no way a 28H/30H comes close at the moment (I even have a 30H at home that I check on occasion to make sure) so that means I need to go up 1-2 cup sizes from what's recommended.
All those calculators can do is give you a good starting point (sounds like BMI, right?

) and from there you have to deal with variations between brands. Some brands might not fit you all together because the wires could be too wide or too narrow. Unfortunately, these things can take a lot of experimentation.
I will say, though, that finding the right band size is definitely the first step. Otherwise it's nearly impossible to find the correct cup size. For instance, that 30H that still gives me the four boob effect? Well, if I don't put the strap on the tightest hook it looks fine, BUT it gives me major back pain after just an hour of wear. So without the correct band size your cup size might be off but you're not able to see it.