Sister Bra Sizes: Guide & Finder
Sister sizes help you adjust band and cup to keep cup volume similar. Use the finder below to get suggestions.
How Sister Sizes Work
- Down band → Up cup (e.g., 34C → 32D)
- Up band → Down cup (e.g., 34C → 36B)
- Try 1–2 steps to fine-tune support and comfort
- Check brand variations and use our Bra Calculator for base size
Sister Bra Sizes Finder
Format: band+cup (e.g., 32B, 34DD). Letters only for cup.
Sister sizes adjust band and cup inversely.
Your Size
Bra Size Calculator
Find your base size, then try sister sizes.
WHR Calculator
Health screening via waist-to-hip ratio.
International Conversion
Convert across US/UK/EU and more.
Popular Size Guides
Learn about specific sizes and their sister size alternatives: