: Subtract your band measurement from your bust measurement. Each inch of difference typically equals one cup size (e.g., 1 inch = A, 2 inches = B, 3 inches = C).

: Measure loosely around the fullest part of your chest.

: Many retailers like ThirdLove and Soma offer virtual "Fitting Room" quizzes that account for breast shape and common fit issues, often proving more accurate than simple measurements alone. 2. Navigating Styles and Sizing

Since you can't try the bra on before paying, your choice of retailer is critical. 10 Tips for Buying a Perfect-Fitting Bra Online - AARP