Bra sizing calculators are soo messed up.

Two years ago I was 39 under breast and 41 across my nipples ..

According to calculators, that's a 40b cup. 

My poor chest swims in a 40b ..but a 38b is ok.

Now I measure my chest, still 39 band but 43 across my nipples.

Now the calculator thinks I am a 40d.

ROTFLMAO .. 

In reality I am still  a 38b, I just fill the cups out better.

My wife is a full 40d, no way in hell could I fill those cups.

Bra sizing calculators are soo messed up.

Two years ago I was 39 under breast and 41 across my nipples ..

According to calculators, that's a 40b cup. 

My poor chest swims in a 40b ..but a 38b is ok.

Now I measure my chest, still 39 band but 43 across my nipples.

Now the calculator thinks I am a 40d.

ROTFLMAO .. 

In reality I am still  a 38b, I just fill the cups out better.

My wife is a full 40d, no way in hell could I fill those cups.

Very interesting as I also have the same problem

Playing around with different Bra's ..

I think what would work best is not a push them up bra, 
but a push them in Bra.

I've pointed this out many times in the past.   The next thing you can do is go for a true fitting.  It might feel awkward at first, but the ladies are completely professional.  They don't judge.   That want you to be the most comfortable you can be, and will do anything they can to ease your mind.

With Four Easy Steps for Finding Your Bra Size at Home. 

https://vstar.in/blog/four-easy-steps-fo...ze-at-home
[url=https://vstar.in/blog/four-easy-steps-for-finding-your-bra-size-at-home][/url]

https://abrathatfits.org/calculator.php
Try this one. Works for me.
Says I am a 40FF UK.

Bra sizing calculators are soo messed up.

Two years ago I was 39 under breast and 41 across my nipples ..

According to calculators, that's a 40b cup. 

My poor chest swims in a 40b ..but a 38b is ok.

Now I measure my chest, still 39 band but 43 across my nipples.

Now the calculator thinks I am a 40d.

ROTFLMAO .. 

In reality I am still  a 38b, I just fill the cups out better.

My wife is a full 40d, no way in hell could I fill those cups.

I too have had that experience and initially it made buying a bra online frustrating. Add to that the crazy variances between brands and materials used makes for a hit and miss proposition. 

I currently have a 4" difference between my chest (36/40) and as you know most of the charts put me into a D where in reality a "B" fills completely with maybe just a hint of overflow in some brands and my GF's C bras swim on me. As long as I know the material content of the bra (non stretchy vs. spandex content) I can buy a 36B (or sister size 38A but rare as hen's teeth) and be highly confident it will fit. 

So, if "I" were to make a chart it would look like this:

 1 inch or less AA
 2 to 3 inches A
 4 inches B
 5 inches C  

The following calculator comes close (depending on minor variations) and whether you select male or female at birth:

https://www.abrathatfits.org/calculator.php