42-Inch Underbust Bra Size
A snug 42″ underbust (107 cm) is a 42 band. Slide to your bust measurement and the size appears; the table shows every cup a 42 band can carry.
My underbust is 42″: what's my size?
The band comes from the underbust alone. 42″ → 42 band whatever your bust; the bust only decides the cup letter: one letter per inch above 42.
Where 42″ lands
A 42 band in every system
Odd number? No. 42 is the 42 band directly. Bands are always even; the underbust reading between them goes to the sister size that fits.
Getting the underbust right
Firm against the ribs, level all the way round, on a normal exhale. A slack tape adds an inch and a band size.
Nearest whole inch, odd rounds up to even. Never add four inches: that is the outdated rule.
The band should fasten on the loosest hook and feel firm; move inward as it stretches over months.
Full technique with diagrams: how to measure your bra size.
42-inch underbust: answered
What band size is a 42 inch underbust?
A 42 band. Even readings are the band directly.
What bra size is a 42 inch underbust and a 45 inch bust?
42C: a three-inch difference on a 42 band. Bust 46 would be 42D, 44 would be 42B.
What is a 42 band in EU sizing?
EU 95 (US band × 2.5 − 10); FR 110; AU 20; IT 7.
Should the tape be tight for the underbust?
Snug: firm against the ribcage like a well-fitting band, not painful. Two inches of slack turns a 34 band into a 36.
Can a 42 inch underbust wear a 40 band?
Often, as a sister size. 40 with one cup letter up holds the same volume on a firmer band, useful if 42 rides up or you are between readings.
Opens HauteFlair’s own hub page; use your measured size there. HauteFlair is owned by the same company as Brasize.ai; that relationship never changes the sizing math, charts, or fit advice on this page. How this site makes money.