Cup Sizes · Foundation

US Bra Size Chart In Inches and Centimeters

by Allena Rissa

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Determining your American bra size can be very confusing. For starters, most women wear a bra that does not properly fit them. Beyond that, different countries use different sizing systems, adding to the confusion.

Bra Size Chart

I have a bra size calculator you can use to properly size yourself using not more than a measure tape. Once you have the correct measurements, use our US bra size conversion chart to get your breast and band size in inches and centimeters. In essence, this is a bra size calculator in inches and centimeters:

    Graphic image of a bra size chart in centimeters starting from 30A until 40DD

    When you know your bra size, it’s relatively simple to convert that to inches. For example, if you are a 32A, that means your band is 32 inches. To determine your breast size, you’d add 1 inch to the band, meaning your breasts are 33 inches.

    Bra Size Measurement & Cup Size | A, B, C, D, DD Bra Sizes AND Extra Large Breasts

    Each letter in a bra size is associated with an “inch” measurement that you can add to the band size to determine your bust size in inches:

    As you can see, figuring out your cup size in inches is not too hard once you know the formula. With centimeters, it’s a little more complicated, and you can use the chart below to see how bra sizes match up to specific centimeters.

    Bust measurement (in centimeters)
    76cm78cm80cm82cm84cm86cm88cm92cm94cm97cm99cm102cm104cm107cm109cm112cm
    Band measurement (in centimeters) 61cm 30A 30B 30C 30D
    64cm 30A 30B 30C 30D
    66cm 30A 30B 30C 30D
    68cm 32A 32B 32C 32D 32DD 32DDD
    71cm 32A 32B 32C 32D 32DD 32DDD
    74cm 34A 34B 34C 34D 34DD 34DDD
    76cm 34A 34B 34C 34D 34DD 34DDD
    78cm 36A 36B 36C 36D 36DD 36DDD
    81cm 36A 36B 36C 36D 36DD 36DDD
    84cm 38A 38B 38C 38D 38DD 38DDD
    86cm 38A 38B 38C 38D 38DD 38DDD
    89cm 40A 40B 40C 40D 40DD
    92cm 40A 40B 40C 40D 40DD

    A Cup Conversions

    An A cup breast is considered to be very small, and is often the bra size worn by teenagers who are still developing.

    Bra SizeBand (in)Bust (in)Band (cm)Bust (cm)
    30A30in31in61cm76cm
    32A32in33in68cm82cm
    34A34in35in74cm86cm
    36A36in37in78cm92cm
    38A38in39in84cm97cm
    40A40in41in89cm102cm

    B Cup Conversions

    A B cup breast is considered small, but close to the average breast size.

    Bra SizeBand (in)Bust (in)Band (cm)Bust (cm)
    30B30in32in61cm78cm
    32B32in34in68cm84cm
    34B34in36in74cm88cm
    36B36in38in78cm94cm
    38B38in40in84cm99cm
    40B40in42in89cm104cm

    C Cup Conversions

    Culturally speaking, the C cup is considered to be the average bra size. 

      Bra SizeBand (in)Bust (in)Band (cm)Bust (cm)
      30C30in33in61cm80cm
      32C32in35in68cm86cm
      34C34in37in74cm92cm
      36C36in39in78cm97cm
      38C38in41in84cm102cm
      40C40in43in89cm107cm

      D Cup Conversions

      While a D cup breast size is considered large by most cultures, it is actually the average boob size in America. 

      Bra SizeBand (in)Bust (in)Band (cm)Bust (cm)
      30D30in34in61cm82cm
      32D32in36in68cm88cm
      34D34in38in74cm94cm
      36D36in40in78cm99cm
      38D38in42in84cm104cm
      40D40in44in89cm109cm

      DD Cup Conversions

      By all accounts, DD boobs are large. They weigh quite a bit and can cause long term back issues. 

      Bra SizeBand (in)Bust (in)Band (cm)Bust (cm)
      30DD30in35in61cm84cm
      32DD32in37in68cm92cm
      34DD34in39in74cm97cm
      36DD36in41in78cm102cm
      38DD38in43in84cm107cm
      40DD40in45in89cm112cm

      DDD Cup Conversions

      DDD boobs are very large. At this size (and larger), they can become a nuisance and impact what you are able to do.

      Bra SizeBand (in)Bust (in)Band (cm)Bust (cm)
      30DDD30in35in61cm86cm
      32DDD32in37in68cm94cm
      34DDD34in39in74cm99cm
      36DDD36in41in78cm104cm
      38DDD38in43in84cm109cm
      40DDD40in45in89cm114cm

      Conclusion

      In conclusion, knowing your accurate bra size can make a huge difference in your comfort, confidence, and overall well-being. With the help of this US bra size chart in inches and centimeters, you can easily measure yourself at home and shop for bras with ease. Remember that each bra size will look quite a bit different on different women, depending on your bone structure, natural waistline, and body shape.