Not sure. I got professional measurement just once, last July. The verdict was 75B but since I didn't like any of those the lady brought me some 75Cs and one of them was okay, so I took it partly because it was shortly after the break from NBE and additional growth was to be expected. But even now that bra is merely okay,  it swallows and covers the breasts instead of accentuating them. A friend gave me a push up bra that appears to be an 80B and I wear that one nowadays, using the tighter pair of hooks. I used to despise the pretense of push ups.... but f*** it, it's the only way known to me I can get a semblance of cleavage on that broad chest of mine:D.