Reviewed
42DD bra size
A 42DD has a 42-inch band and a DD cup, about 5 inches between band and bust. In the UK it is 42DD, in Australia 20DD and in Europe 95E.
- US
- 42DD
- UK
- 42DD
- AU
- 20DD
- EU
- 95E
- FR
- 110E
Also fits (sister sizes): 40DDD firmer band · 44D looser band · all same-volume sizes ↓
42DD measurements
- Snug underbust
- 42–43 in · 107–109 cm
- Bust, fullest part
- about 47 in · 118–121 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.
42DD sister sizes
Same cup volume, different band. If a 42DD 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 42DD doesn't fit
- Band rides up at the back
- Try 40DDD
- Band digs in, cups fit
- Try 44D
- Spilling over the cups
- Try 42DDD
- Cups gape or wrinkle
- Try 42D
Not sure what's wrong? Run through the 4-point fit check.
42DD questions
What is the sister size of 42DD?
40DDD (one band down, one cup up) and 44D (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 42DD in UK, Australian and European sizes?
UK 42DD, Australia 20DD, Europe 95E and France 110E. US and UK cup letters match up to DD and then split.
What measurements are a 42DD?
A snug underbust of about 42–43 in (107–109 cm) and a bust of about 47 in (118–121 cm). Measure with the tape level and use the calculator for an exact result.
Is 42DD a big size?
42DD has a very full cup volume for a 42 band. Cup letters only mean something next to the band: a 42DD holds the same as 28L or 30K.