Bra Sister Size Calculator

Bra sister sizes are alternate sizes that maintain the same cup volume while adjusting the band size. For example, if you wear a 34C, your sister sizes include 32D (down a band size, up a cup size) and 36B (up a band size, down a cup size). Sister sizes can help you find a better-fitting bra when your usual size is unavailable.

Bra Sister Size Calculator






Here's a table illustrating sister sizes for bras, showing how band size and cup size change while maintaining the same cup volume:

Current Bra SizeSister Size (Up in Band, Down in Cup)Sister Size (Down in Band, Up in Cup)
30A32AA28B
30B32A28C
30C32B28D
30D32C28DD (E)
30DD (E)32D28DDD (F)
30DDD (F)32DD (E)28G
32A34AA30B
32B34A30C
32C34B30D
32D34C30DD (E)
32DD (E)34D30DDD (F)
32DDD (F)34DD (E)30G
34A36AA32B
34B36A32C
34C36B32D
34D36C32DD (E)
34DD (E)36D32DDD (F)
34DDD (F)36DD (E)32G
36A38AA34B
36B38A34C
36C38B34D
36D38C34DD (E)
36DD (E)38D34DDD (F)
36DDD (F)38DD (E)34G

Please note that this table represents common sister sizes, but there can be variations between brands and sizing systems. Sister sizing is a useful tool for finding a more comfortable fit when your regular size isn't available or doesn't provide the desired support.

FAQs

Here are the answers to your questions:

  1. How do you calculate bra sister size?
    To calculate a sister size, you can either go up in band size and down in cup size or go down in band size and up in cup size while keeping the same cup volume. For example, if you wear a 34C, your sister size could be 36B (up in band, down in cup) or 32D (down in band, up in cup).
  2. What bra size is equivalent to 36 DDD?
    The sister size equivalent to 36DDD is 38DD (up in band, down in cup) or 34G (down in band, up in cup).
  3. What is a 32 D sister size?
    The sister size for 32D is 34C (up in band, down in cup) or 30DD (down in band, up in cup).
  4. Is a 36C bigger than 34C?
    Yes, a 36C has a larger band size than a 34C. The cup size (C) remains the same, but the band size is different.
  5. Do bra sister sizes work?
    Sister sizes can work as an alternative fit if your regular size is uncomfortable. They have the same cup volume, so the fit may vary slightly due to band size differences.
  6. What is the sister size rule?
    The sister size rule involves changing the band size and cup size in opposite directions while maintaining the same cup volume. Going up in band size means going down in cup size, and vice versa.
  7. What is a DDD cup equal to?
    A DDD cup is equal to an E cup in some sizing systems and an F cup in others, depending on the brand and country.
  8. What bra size is similar to 38DDD?
    The sister size similar to 38DDD is 40DD (up in band, down in cup) or 36G (down in band, up in cup).
  9. Is a 34DD the same as a 36D?
    No, a 34DD and a 36D have different band sizes. The cup volume is the same, but the band size is different.
  10. Should I go up a cup size or band size?
    Whether you should go up a cup size or band size depends on your comfort and fit. If the band feels tight, consider going up in band size. If the cups feel small, consider going up in cup size.
  11. Is a DDD Cup big?
    Yes, a DDD cup is considered a larger cup size, often associated with a full bust.
  12. Is 32D the same as 34C?
    No, a 32D and a 34C have different band sizes. The cup volume is the same, but the band size is different.
  13. What should I do if my bra cup is too big?
    If your bra cup is too big, you may want to try a smaller cup size while keeping the same band size or consider a sister size with a smaller cup volume.
  14. Is 34D and 36C the same?
    No, a 34D and a 36C have different band sizes. The cup volume is the same, but the band size is different.
  15. What is the next cup size after DDD?
    The next cup size after DDD is often labeled as E or F in different sizing systems.
  16. Why wear sister size bra?
    Some people wear sister sizes to adjust the fit of a bra when their regular size is not available or doesn't provide the desired comfort.
  17. Why do sister sizes exist?
    Sister sizes exist to offer a range of band and cup combinations that provide a similar fit and cup volume for individuals with different body shapes.
  18. Why do you add 4 to bra size?
    Adding 4 to your underbust measurement is an outdated method for determining band size. It was used in the past but is not as accurate as measuring your underbust directly.
  19. What if my 34C cup is too small?
    If your 34C cup is too small, you may want to try a larger cup size (e.g., 34D) to get a better fit for your bust.
  20. Is 36C the same as 38B?
    No, a 36C and a 38B have different band sizes. The cup volume is different as well.
  21. What is the sister size for 34B?
    The sister size for 34B could be 36A (up in band, down in cup) or 32C (down in band, up in cup).
  22. Why do my breasts fall out of my bra when I bend over?
    If your breasts fall out of your bra when you bend over, it may be due to a cup size that is too small or a band size that is too loose. Adjusting your bra size can help prevent this issue.
  23. Is 38DDD the same as 38F?
    In some sizing systems, 38DDD is considered equivalent to 38F, while in others, it may be labeled differently.
  24. Is a DDD bra equal to an F?
    In many sizing systems, a DDD cup is considered equivalent to an F cup.
  25. Is a 40D bigger than a 38DDD?
    Yes, a 40D has a larger band size than a 38DDD. The cup volume may be similar, but the band size is different.
  26. What's the difference between 38dd and 38DDD?
    The main difference is in cup volume. A 38DD has a smaller cup volume than a 38DDD, with the latter having a larger cup size.
  27. Is a 38DDD an XL?
    Bra sizes like 38DDD are not typically classified as XL. They are specific to bras and represent band and cup measurements.
  28. Is 38DD bigger than 34DD?
    Yes, a 38DD has a larger band size than a 34DD. The cup volume may be the same, but the band size is different.
  29. Why do I have to keep pulling my bra down?
    If you have to keep pulling your bra down, it may be due to a band size that is too large. A well-fitting bra should stay in place without the need for constant adjustments.
  30. How do you measure your bra size for saggy breasts?
    When measuring for a bra with saggy breasts, it's important to measure your underbust (band size) and fullest part of your bust (cup size) while wearing a non-padded bra. Ensure the tape measure is snug but not tight.
  31. How many bras should I own?
    It's recommended to have at least a few bras in your regular rotation to extend their lifespan. Some people prefer to have a variety of bras for different outfits and occasions.
  32. What is the average breast size?
    The average breast size can vary by region and population, but it's typically in the range of B to C cup in many countries.
  33. What is the most common bra size?
    The most common bra sizes often fall within the range of B to D cup, depending on the region.
  34. What is the largest bra size sold in stores?
    The largest bra sizes available in stores can vary, but some stores may carry sizes up to H or even larger.
  35. How to increase breast size?
    Breast size is largely determined by genetics, but there are no guaranteed methods for increasing breast size naturally. Some people consider breast augmentation surgery for a permanent size increase.
  36. What bra size should a 14-year-old girl have?
    The appropriate bra size for a 14-year-old girl can vary greatly based on individual development. It's essential to measure and fit for comfort and support.
  37. What does a 32D look like?
    A 32D bra typically has a band size of 32 inches and a cup size that accommodates a moderate amount of breast tissue.
See also  Cohort Study Sample Size Calculator

Please note that bra sizing can vary between brands and regions, so it's essential to try on different sizes to find the best fit for your body.

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