Reviewed
42I (UK 42G) bra size
A 42I has a 42-inch band and a I cup, about 9 inches between band and bust. In the UK it is 42G, in Australia 20G and in Europe 95I.
- US
- 42I
- UK
- 42G
- AU
- 20G
- EU
- 95I
- FR
- 110I
Also fits (sister sizes): 40J firmer band · 44H looser band · all same-volume sizes ↓
42I measurements
- Snug underbust
- 42–43 in · 107–109 cm
- Bust, fullest part
- about 51 in · 128–131 cm
- Cup difference
- 9 in (I 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.
42I sister sizes
Same cup volume, different band. If a 42I 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 42I doesn't fit
- Band rides up at the back
- Try 40J
- Band digs in, cups fit
- Try 44H
- Spilling over the cups
- Try 42J
- Cups gape or wrinkle
- Try 42H
Not sure what's wrong? Run through the 4-point fit check.
42I questions
What is the sister size of 42I?
40J (one band down, one cup up) and 44H (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 42I in UK, Australian and European sizes?
UK 42G, Australia 20G, Europe 95I and France 110I. US and UK cup letters match up to DD and then split.
What measurements are a 42I?
A snug underbust of about 42–43 in (107–109 cm) and a bust of about 51 in (128–131 cm). Measure with the tape level and use the calculator for an exact result.
Is 42I a big size?
42I has a very full cup volume for a 42 band. Cup letters only mean something next to the band: a 42I holds the same as 30O or 32N.