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42I Bra Size — UK, EU & French Conversion

A US 42I bra in UK, European and French sizing, with its sister sizes. Not sure 42I is right? Measure with the bra calculator first.

Reviewed by the 247Sizing teamLast updated: 27 August 2026
US 42I = UK 42G
EU 95I · French 110I

A US 42I bra converts to UK 42G, EU 95I and French 110I. The band number maps on a fixed scale, while cup letters shift between systems above D.

RegionSize
US42I
UK42G
EU (Europe)95I
FR / ES (France, Spain)110I

Sister sizes for 42I

Same cup volume, different band — try these if the band feels tight or loose but the cup is right:

40JSister down
44HSister up
⚠️ US cup lettering above D varies by brand (DD vs E, DDD vs F). Match by the EU/UK equivalent when a brand's letters differ.

40I · 44I · 42H · 42J

All bra sizes → · Bra calculator → · Converter →

What is a US 42I bra in UK and EU sizing?

A US 42I is a UK 42G, EU 95I and French 110I.

What are the sister sizes of 42I?

Same cup volume, different band: 40J, 44H.

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