There has been a few threads bout this topic lately, and figured I would share a little something.
Just for giggles I fed my measurements (36 and 40, I'm closer to 37, but for this we'll say 36) into 16 online bra calculators to see what they claimed my size was. Note, all sizes are American, and I actually have a 36C and 38B bra that I wear with enhancers (they add 1-1.5 cup) that fit me quite well. Thus just shows how much confusion there really is in this stuff.
These are the results
1x 36D (Wishful thinking on their part and mine)
1x 38B
3x 40AA
1x 40 Nearly A
1x 40B
5x 42AA
1x 42B
2x 42C (no way in hell!)
Notes:
Some sites were just random sites, some were stores, some were manufacturers. Some manufacturers seem to be trying to establish a new way of measuring. Some use the old method of adding inches, some don't. All I see, is a mess. I suspect the 42AA's were using the same calculator script, if not owned by the same company, so I wouldn't put much faith in that number being correct either.
Some silly quotes I got.
One site told me I was "Not in a range our system uses" I later determined they thought I was a 40AA. Which was added to the results.
Another simply said:
"Your bra size is 42
But no bra is needed if these measurements are correct." (What, no cup size?)