Bra Sister Size Calculator
Find your bra sister sizes for a tighter or looser band with equivalent cup volume.
Inputs
Results
Tighter Band
32D
Looser Band
36B
How to use this calculator
- 1Enter your current US band and cup.
- 2Try the tighter-band/larger-cup or looser-band/smaller-cup option.
- 3Sister sizes share cup volume but change band fit.
Frequently Asked Questions
How to Use
About the Bra Sister Size Calculator
What it calculates
Finds sister sizes — same cup volume with a tighter or looser band (e.g., 34C ↔ 32D ↔ 36B).
When to use it
Use when your band feels too tight but the cup fits, or vice versa.
Example
34C sister sizes: tighter band 32D, looser band 36B.
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