Step 1: Find Your Band Size

  • Measure the rib cage just below the breast. If the number is 33 or less add 5 inches to that number, over 33 inches add 3 inches to get you bra size. Round odd numbers up to even. This is your band size.

Step 2: Find Your Bust Measurement

  • Measure around the fullest part of your chest at nipple level. The tape measure should be pressing loosely against your body.
  • Round up to the nearest whole number. This is your bust measurement.

    Step 3: Calculate Your Cup Size

    • Subtract your band size (step 1) from your bust measurement (step 2).
    • If the difference between the measurements is:

    0" - cup size is AA
    1" - cup size A
    2" - cup size is B
    3" - cup size is C
    4" - cup size is D
    5" - DD or E
    6" - cup size is DDD or F
    7" - G