1. My bust size (B)
First, measure your bust size just below your chest. And then, look at the first table line and find the appropriate cell.
2. My chest size (A)
Now, measure your chest size using a tape measure. You have to measure your chest size horizontally across the tip of your breasts.
3. My bra size (A-B)
To conclude, do a subtraction: A - B. This number gives you the right depth of cup.