3: Cup size
Subtract your Bust (Cup) measurement from your band measurement to find your cup size. Match the number to this bra size chart to determine your cup size.
Let's say your bust measurement is 51 inches and your band size is 46 inches. 51-46=5, so using the chart below, you are a DD cup. You will want to shop for size 46DD bras.
||6"= DDD & F
One more thing:
If you haven't measured yourself for a year or more, your bra size may have changed. Exercise, aging, pregnancy, and weight gain or loss can affect your bra size. Pick a month and try to remember to measure during that month every year.