Bra size guide and converter

Locate your current bra size in the chart below to find your Sister Size DOWN. If your answer is “the loosest hook possible,” your Sister Size UP just might work for you! Locate your current bra size in the chart below to find your Sister Size UP.

How do the Bra Size Charts work with your bust? All resources from BraSize.

Looking for your perfect fitting bra? Use our chart to refine your fit based on the bra size you currently wear. Usually fall between sizes? Try our half-cup sizes.
Locate your current bra size in the chart below to find your Sister Size DOWN. If your answer is “the loosest hook possible,” your Sister Size UP just might work for you! Locate your current bra size in the chart below to find your Sister Size UP.
Looking for your perfect fitting bra? Use our chart to refine your fit based on the bra size you currently wear. Usually fall between sizes? Try our half-cup sizes.
Example: If you use bra size 12A, a 10B, 8C or a 14AA may also fit you (they all have the same cup size as your usual bra size 12A) Bra Sister Size, French: How to use it? Find your FR (France, Spain, Belgium, Portugal) bra size in the chart below.
Below you will find a bra size converter, to convert to international sizes. The first chart converts the band size, and the second converts the cup size. You will also find a bra sizing guide, to find your correct US size. Please note that these conversion table only give an estimate to your bra size, as sizes may vary between different bra manufacturers.
Bra Size Chart > Cup Size

Convert band size

Locate your current bra size in the chart below to find your Sister Size DOWN. If your answer is “the loosest hook possible,” your Sister Size UP just might work for you! Locate your current bra size in the chart below to find your Sister Size UP.

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Bra sizes marked with the same color (placed in the same row) are sister sizes and do have about the same cup volume (actual cup size) as your usual bra size - and may fit you! So, if you i.e. are using bra size 34C, a 32D or a 36B may also fit your bust! To determine your cup size, subtract your band measurement from your bust measurement. Refer to our cup size chart to determine your cup size. If you're larger than a D cup, use HerRoom's Universal Cup Sizing™ System to find the right cup size for every brand, every time. Example: If you use bra size 12A, a 10B, 8C or a 14AA may also fit you (they all have the same cup size as your usual bra size 12A) Bra Sister Size, French: How to use it? Find your FR (France, Spain, Belgium, Portugal) bra size in the chart below.

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