Reviewed
38B bra size
A 38B has a 38-inch band and a B cup, about 2 inches between band and bust. In the UK it is 38B, in Australia 16B and in Europe 85B.
- US
- 38B
- UK
- 38B
- AU
- 16B
- EU
- 85B
- FR
- 100B
Also fits (sister sizes): 36C firmer band · 40A looser band · all same-volume sizes ↓
38B measurements
- Snug underbust
- 38–39 in · 97–99 cm
- Bust, fullest part
- about 40 in · 100–103 cm
- Cup difference
- 2 in (B 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.
38B sister sizes
Same cup volume, different band. If a 38B 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 38B doesn't fit
- Band rides up at the back
- Try 36C
- Band digs in, cups fit
- Try 40A
- Spilling over the cups
- Try 38C
- Cups gape or wrinkle
- Try 38A
Not sure what's wrong? Run through the 4-point fit check.
Compare 38B
Sizes next to 38B
38B questions
What is the sister size of 38B?
36C (one band down, one cup up) and 40A (one band up, one cup down). Sister sizes hold the same cup volume on a different band.
What is 38B in UK, Australian and European sizes?
UK 38B, Australia 16B, Europe 85B and France 100B. US and UK cup letters match up to DD and then split.
What measurements are a 38B?
A snug underbust of about 38–39 in (97–99 cm) and a bust of about 40 in (100–103 cm). Measure with the tape level and use the calculator for an exact result.
Is 38B a big size?
38B has a fuller cup volume for a 38 band. Cup letters only mean something next to the band: a 38B holds the same as 28G or 30DDD.