How to Calculate Nursing Bra Size

A nursing bra that fits properly provides comfort, support and easy access to the breasts for breastfeeding. A nursing bra that is too tight can cause discomfort, blocked milk ducts and infection. Accurate measurement of your body at the proper stage of your pregnancy is essential for calculating the correct nursing bra size. Once you have your proper nursing bra size, you can find a bra that will be comfortable.
Step 1
Wait to buy nursing bras until the final couple of weeks of your pregnancy or right after childbirth to allow for last minute changes in your breast size.

Step 2
Wrap a measuring tape around your back, under your arms and directly underneath your breasts. Write down your measurement.
Step 3
Find your band size by adding 3 inches to your measurement. If the new number is odd, round up to the next even number.
Step 4
Find your cup measurement by wrapping a measuring tape around your back, under your arms and across the largest part of your breasts. Write down your measurement.
Step 5
Find your cup size by subtracting your band size from the cup measurement you took in Step 4.
Step 6
Consult a cup size chart and use the difference between your band size and cup measurement to determine your cup size. Your nursing bra size includes your band size and your cup size. For example, if your band size is 36 and your cup size is D, then your bra size is 36D.
Tips and Warnings

  • The difference in inches between your band size and cup measurement equals your cup size: 0 to 1 inch difference = A cup; 2 inch difference = B cup; 3 inch difference = C cup; 4 inch difference = D cup; 5 inch difference = DD or E cup; 6 inch difference = DDD or F cup; 7 = G cup and so on.

Things You'll Need

  • Measuring tape
  • Pen
  • Paper


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