Sister Size Finder
Enter your current bra size to find sister sizes with the same cup volume.
Your Current Size
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Your Sister Sizes
These sizes have the same cup volume as your current size:
Complete Sister Size Chart
All sizes in the same row have the same cup volume.
| Cup Volume | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 |
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How Sister Sizing Works
When you change band size, you must also change cup size to maintain the same cup volume:
- Going down a band size? Go up a cup size (e.g., 34C → 32D)
- Going up a band size? Go down a cup size (e.g., 34C → 36B)
This is useful when your calculated size isn't available, or when a brand runs large/small in the band.