Above the most accurate bra size calculator available online. It will show your bra size in UK or US sizes. Basically, the UK cup size is the same as it would be in Aust sizes... with 32 being a size 10, 34 a 12, 36 a 14, etc.
So many women wear the wrong size... usually a much-too-big band size and therefore a smaller cup size to compensate.
Get some measuring tape and give the calculator a go... how did you measure up? Same as you're wearing, or heaps different?
I did this ages back when Bras n Things (notoriously bad at measuring) tried to tell me I was some size that totally didn't fit in any way at all (16C... yet wearing size 12 clothes and C? Yeah, just no...). Calc said I was 34FF, therefore a 12FF... found one (miraculously!) and gave it a go. Yep, perfect.
So... how do you measure up?!