Bra Sister Size Chart

The chart shows related bra sizes where you can go up or down in band size while maintaining the same cup size.

Your Bra Size Sister Size Down Sister Size Up
30A 28B 32AA
30B 28C 32A
32A 30B 34AA
32B 30C 34A
34A 32B 36AA
34B 32C 36A
36A 34B 38AA
36B 34C 38A
38A 36B 40AA
38B 36C 40A

The Bra Sister Size Chart is a useful tool for finding alternative bra sizes that may fit you well, even if your usual size is not available. The chart provides a comparison of your bra size with sister sizes that are one size down and one size up. This allows you to explore different options and find a bra with a similar fit and comfort level. By understanding your sister sizes, you can expand your choices when shopping for bras and ensure you have a variety of options to choose from.


What is a bra sister size?

A bra sister size refers to a different bra size that has the same cup volume as your usual size.

How can I find my bra sister size?

To find your bra sister size, you can go up one band size and down one cup size or go down one band size and up one cup size from your regular size.

Why would I want to know my bra sister size?

Knowing your bra sister size allows you to have more options when shopping for bras. If your usual size is not available, you can try your sister size for a similar fit.

Can I wear my bra sister size instead of my regular size?

While you can wear your bra sister size, it may not provide the best fit and support as your regular size. It's recommended to try on both sizes to see which fits better.

Does the bra sister size chart work for all brands?

The bra sister size chart serves as a general guide, but it may not be accurate across all brands. Different brands may have slight variations in sizing, so it's always best to try on bras before purchasing.

How we write our statistic reports:

We have not conducted any studies ourselves. Our article provides a summary of all the statistics and studies available at the time of writing. We are solely presenting a summary, not expressing our own opinion. We have collected all statistics within our internal database. In some cases, we use Artificial Intelligence for formulating the statistics. The articles are updated regularly.

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