Size Guide
30B Bra Size
Everything you need to know about bra size 30B — measurements, sister sizes, international equivalents, and fit advice.
Measurements for 30B
Underbust (Band)
29 to 31 inches (74 to 79 cm)
Full Bust
approximately 33 inches (84 cm)
30B in Other Sizing Systems
US
30B
UK
30B
EU
65B
FR
80B
AU
8B
Sister Sizes for 30B
These sizes have the same cup volume as 30B. Try them if the band feels too tight or too loose.
28C ↔ 30B ↔ 32A
← Tighter band, bigger cup · Looser band, smaller cup →
Fit Tips for 30B
B cups are among the most widely available sizes. If gapping occurs, try a demi-cup or push-up style.
If your 30B bra is gapping at the top of the cup, the cup may be too large or the wrong shape — try a demi-cup or balconette. If the center gore doesn't sit flat, go up one cup size.
Not sure about your size? Measure yourself and double-check.
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