Find Out Your Nursing Bra Size


How to Measure Your Bra Size

This method for calculating bra size is based on measurements taken in inches.  If you are measuring in cm, convert your measurements to inches for the last step.  (1 inch = 2.54 cm)

Step 1: Rib Band Measurement

Measure your chest above your breasts - make sure the tape is around your back and under your armpits. Check in the mirror to ensure the measuring tape is parallel to the floor along your back. The tape should be snug around your body without any fingers underneath the tape. If you are in between band sizes, round up or down to the nearest even number. This will be your rib band size (34, 36 etc.).


Step 2: Cup Size Measurement

Measure around the fullest part of your breasts, over your nipple area. This is a looser measurement than the rib band measurement. While holding both ends of the tape with one hand at the side of your breast, use your free hand to press the measuring tape in between your breasts to your chest. This will provide a more accurate cup size.


Step 3: Do the Math

Subtract the rib band measurement from the cup size measurement. The difference represents your letter cup size.  Make sure the measurements are in inches when you do the subtraction.

(1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H, 9=I, 10=J)



Rib band measurement: 34"

Cup size measurement: 38"

Cup size: 38-34 = 4 = D

Your nursing bra size is 34D


Congratulations!  You have your bra size.  

Are you now wondering, with all the changes going on with your body, how long you will remain this size?  Rest assured, nursing bras are designed to adapt to breast size fluctuations.  However, we've put together some tips on how to shop for your best nursing bra fit at various stages of your journey.  Check it out here:

How to Shop for Nursing Bras at Different Stages of Pregnancy & Nursing