Reviewed
40DDD (UK 40E) bra size
A 40DDD has a 40-inch band and a DDD cup, about 6 inches between band and bust. In the UK it is 40E, in Australia 18E and in Europe 90F.
- US
- 40DDD
- UK
- 40E
- AU
- 18E
- EU
- 90F
- FR
- 105F
Also fits (sister sizes): 38G firmer band · 42DD looser band · all same-volume sizes ↓
40DDD measurements
- Snug underbust
- 40–41 in · 102–104 cm
- Bust, fullest part
- about 46 in · 116–118 cm
- Cup difference
- 6 in (DDD 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.
40DDD sister sizes
Same cup volume, different band. If a 40DDD 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 40DDD doesn't fit
- Band rides up at the back
- Try 38G
- Band digs in, cups fit
- Try 42DD
- Spilling over the cups
- Try 40G
- Cups gape or wrinkle
- Try 40DD
Not sure what's wrong? Run through the 4-point fit check.
Compare 40DDD
Sizes next to 40DDD
40DDD questions
What is the sister size of 40DDD?
38G (one band down, one cup up) and 42DD (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 40DDD in UK, Australian and European sizes?
UK 40E, Australia 18E, Europe 90F and France 105F. US and UK cup letters match up to DD and then split.
What measurements are a 40DDD?
A snug underbust of about 40–41 in (102–104 cm) and a bust of about 46 in (116–118 cm). Measure with the tape level and use the calculator for an exact result.
Is 40DDD a big size?
40DDD has a very full cup volume for a 40 band. Cup letters only mean something next to the band: a 40DDD holds the same as 28L or 30K.