Don't rely on your current bra size, as breast size can change up to six times in a lifetime due to weight or hormonal shifts.
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 buy bra online
: 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). Don't rely on your current bra size, as
: Measure loosely around the fullest part of your chest. Each inch of difference typically equals one cup size (e
: Wrap a soft tape measure snugly under your bust, keeping it level with the floor. If the measurement is an odd number, round up to the nearest even inch.
Sizing is not universal; a 34B in one brand may be a 34DD in another.