How to Calculate Bra Sister Size 

A sister size is a bra size that has the same cup volume as another bra size, but with a different band size and cup letter. In other words, a sister size is a bra that has a different measurement around the rib cage but has the same cup size as another bra.

For example, if a woman wears a 34C bra and wants to try a bra with a smaller band size, she could try a 32D bra. The 32D bra would have a smaller band size but the same cup volume as the 34C bra.

Sister sizes can be helpful for women who are between bra sizes or have trouble finding a bra that fits comfortably. By trying a sister size, a woman can find a bra that has a better fit around the rib cage or offers a more comfortable and supportive fit for the bust.

It’s important to note that sister sizes are not exact matches and may still require some adjustment to find the perfect fit. It is always recommended to try on bras before purchasing them to ensure a proper fit.

Finding out a Bra Sister Size manually is tedious, it is advisable to use a standard bra sister sizes calculator like this one to avoid errors.

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Understand the Bra Measurement System

Bra sizing is determined by 2 standard measurements: 

1. Band size

The band size is a critical measurement in determining a woman’s bra size. It is the measurement around the rib cage, just below the bust, and is represented by a number (e.g., 32, 34, 36, etc.). The band size measurement provides the foundation for the bra’s support and helps to ensure a proper fit.

A properly fitted band should be snug but not too tight. If the band is too loose, it will not provide adequate support and can cause discomfort. On the other hand, if the band is too tight, it can cause skin irritation, restriction of breathing, and physical discomfort.

It’s important to note that band sizes can vary between brands and styles, so it’s always best to try on bras before purchasing them. In some cases, women may require a custom band size as every woman’s body is unique and may not conform to standard sizes.

When measuring your band size, it’s important to use a tape measure and make sure it is level and not too tight. The measurement should be rounded up to the nearest whole number. Once the band size is determined, it can be used in conjunction with the cup size measurement to determine a woman’s bra size.

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1. Cup size

Cup size is the other measurement used to determine a woman’s bra size. It is the measurement of the bust at its fullest point and is represented by a letter (e.g., A, B, C, D, etc.). The cup size measurement is used in conjunction with the band size measurement to determine a woman’s bra size.

A properly fitted cup size should be snug without any bulging or gaping. The cup size should fully contain the bust without any spillage. If the cup size is too small, it will cause discomfort and may result in spillage. On the other hand, if the cup size is too big, it will result in gaping and a lack of support.

It’s important to note that cup sizes can vary between brands and styles, so it’s always best to try on bras before purchasing them. In some cases, women may require a custom cup size as every woman’s body is unique and may not conform to standard sizes.

When measuring your cup size, it’s important to use a tape measure and make sure it is level with your nipples. The measurement should be taken at the fullest part of the bust. Once the cup size is determined, it can be used in conjunction with the band size measurement to determine a woman’s bra size.

Tips for Proper Bra Fit

1. Consider the Material of the Bra: Different materials can affect the fit of a bra, so consider the material when selecting a bra.
2. Make Sure the Band is Secure: The band of the bra should be secure and not move around. If it is too loose, it will not provide adequate support.
3. Ensure the Cups Fit Properly: The cups of the bra should fit snugly without any bulging or gaping.

Conclusion

In conclusion, calculating your bra sister size is best done with a specialized bra conversion tool like the one developed by womencalculators.com

There are other online tools as well you can use to find your perfect sizes, especially as a woman.