Size Guide
30DD Bra Size
Everything you need to know about bra size 30DD — measurements, sister sizes, international equivalents, and fit advice.
Measurements for 30DD
Underbust (Band)
29 to 31 inches (74 to 79 cm)
Full Bust
approximately 36 inches (91 cm)
30DD in Other Sizing Systems
US
30DD
UK
30DD
EU
65E
FR
80E
AU
8DD
Sister Sizes for 30DD
These sizes have the same cup volume as 30DD. Try them if the band feels too tight or too loose.
28DDD ↔ 30DD ↔ 32D
← Tighter band, bigger cup · Looser band, smaller cup →
Fit Tips for 30DD
DD cups need good band support. Make sure 80% of support comes from the band, not the straps.
If your 30DD 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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