Reviewed
30DD bra size
A 30DD has a 30-inch band and a DD cup, about 5 inches between band and bust. In the UK it is 30DD, in Australia 8DD and in Europe 65E.
- US
- 30DD
- UK
- 30DD
- AU
- 8DD
- EU
- 65E
- FR
- 80E
Also fits (sister sizes): 28DDD firmer band · 32D looser band · all same-volume sizes ↓
30DD measurements
- Snug underbust
- 30–31 in · 76–79 cm
- Bust, fullest part
- about 35 in · 88–90 cm
- Cup difference
- 5 in (DD cup)
These are starting points from the band-and-cup method. Brands differ by about a size, so a two-minute measurement beats any chart.
30DD sister sizes
Same cup volume, different band. If a 30DD band feels too loose, go down a band and up a cup; if it feels tight, go up a band and down a cup.
If a 30DD doesn't fit
- Band rides up at the back
- Try 28DDD
- Band digs in, cups fit
- Try 32D
- Spilling over the cups
- Try 30DDD
- Cups gape or wrinkle
- Try 30D
Not sure what's wrong? Run through the 4-point fit check.
Compare 30DD
Sizes next to 30DD
30DD questions
What is the sister size of 30DD?
28DDD (one band down, one cup up) and 32D (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 30DD in UK, Australian and European sizes?
UK 30DD, Australia 8DD, Europe 65E and France 80E. US and UK cup letters match up to DD and then split.
What measurements are a 30DD?
A snug underbust of about 30–31 in (76–79 cm) and a bust of about 35 in (88–90 cm). Measure with the tape level and use the calculator for an exact result.
Is 30DD a big size?
30DD has a fuller cup volume for a 30 band. Cup letters only mean something next to the band: a 30DD holds the same as 28DDD or 32D.