Sizing decoded May 30, 2026 3 min read
What Does 32A, 34B, 36C Mean in Bras?
Number = band size in inches. Letter = cup difference. 32A = 32" underbust + 1" cup. Decoder below.
The Decoder
Number = band, letter = cup
32A means 32-inch underbust (band) + A cup (1 inch larger at bust). The two-part system is universal for traditional bras.
Cup Letter Math
| Cup | Bust − Underbust |
|---|---|
| AA | 0.5" |
| A | 1" |
| B | 2" |
| C | 3" |
| D | 4" |
| DD/E | 5" |
| DDD/F | 6" |
| G | 7" |
| H | 8" |
Worked Examples
| Size | Underbust | Bust |
|---|---|---|
| 32A | 32" | 33" |
| 32B | 32" | 34" |
| 34B | 34" | 36" |
| 34C | 34" | 37" |
| 36C | 36" | 39" |
| 36D | 36" | 40" |
FAQs
What does 32A mean?
32" underbust + A cup (1" cup diff) = 33" bust.
What does 34B mean?
34" underbust + 2" cup = 36" bust.
What does 36C mean?
36" + 3" = 39" bust.
Bigger letter = bigger volume?
No — depends on band too.
Sister size?
Same volume, different band.
Two Numbers, Right Bra
For full bra sizing see bra size chart; sister sizes; how to measure bra.
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