Reviewed
34DD bra size
A 34DD has a 34-inch band and a DD cup, about 5 inches between band and bust. In the UK it is 34DD, in Australia 12DD and in Europe 75E.
- US
- 34DD
- UK
- 34DD
- AU
- 12DD
- EU
- 75E
- FR
- 90E
Also fits (sister sizes): 32DDD firmer band · 36D looser band · all same-volume sizes ↓
34DD measurements
- Snug underbust
- 34–35 in · 86–89 cm
- Bust, fullest part
- about 39 in · 98–100 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.
34DD sister sizes
Same cup volume, different band. If a 34DD 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 34DD doesn't fit
- Band rides up at the back
- Try 32DDD
- Band digs in, cups fit
- Try 36D
- Spilling over the cups
- Try 34DDD
- Cups gape or wrinkle
- Try 34D
Not sure what's wrong? Run through the 4-point fit check.
Compare 34DD
Sizes next to 34DD
34DD questions
What is the sister size of 34DD?
32DDD (one band down, one cup up) and 36D (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 34DD in UK, Australian and European sizes?
UK 34DD, Australia 12DD, Europe 75E and France 90E. US and UK cup letters match up to DD and then split.
What measurements are a 34DD?
A snug underbust of about 34–35 in (86–89 cm) and a bust of about 39 in (98–100 cm). Measure with the tape level and use the calculator for an exact result.
Is 34DD a big size?
34DD has a fuller cup volume for a 34 band. Cup letters only mean something next to the band: a 34DD holds the same as 28H or 30G.