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Step 1
Use a tape measure to measure under your breast, around the ribcage. Ensure that the tape measure is flat all the way around and is not twisted. Make a note of this measurement.
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Step 2
Determine the measurement around the fullest part of your breast by using a tape measure. Again, ensure that the tape measure is not twisted. Make note of this measurement.
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Step 3
Figure out your band size. The first measurement is your band size. If you measured 34 inches, then the first part of your bra size will be 34.
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Step 4
Add five to this first measurement. Then subtract the two measurements to find your cup size. One inch is A, two inches is a B, three inches is a C, and so on.
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Step 5
Try on different bras to determine if the size is accurate. Different companies have different sizing. Find one that is comfortable and gives you adequate support.










