38B Bra Size, Fully Explained
38B is squarely in the core of the size chart: a mid-range band with a gentle difference. Nearly every brand cuts it, which makes fit problems here almost always construction or wear-routine issues rather than availability ones.
38B in every sizing system
| US | UK | EU | FR | AU | JP | KR |
|---|---|---|---|---|---|---|
| 38B | 38B | 85B | 100B | 16B | C85 | C85 |
Sister sizes of 38B
Each sister holds roughly the volume of 38B on a different band. Band riding up in a 38B? Try 36C. Band digging painfully? The other direction.
How 38B compares, visually
Circle areas scale with estimated cup volume: 38B ≈ 206 cc per cup, roughly 0.2 kg of tissue per side at typical density. Model documented on the weight page.
Is 38B big?
Is 38B big? In absolute terms it is on the smaller side of the chart, but the honest answer is that the question is mostly noise: the letter only means something relative to the 38 band, and bodies wear the same volume completely differently. What matters is that 38B fits its wearer, which the fit checks decide better than comparison ever will.
Shopping notes for 38B
Confirm the size first: two minutes with the calculator beats inheriting a label. Then let the brand decoder translate 38B into each brand's cut, since the same tag runs shallow at mall brands and deep at UK houses. If 38B passes the band checks but the cup misbehaves, that is usually shape, not size.
Frequently asked questions
Last updated August 2026.