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46B Bra Size — UK, EU & French Conversion

A US 46B bra in UK, European and French sizing, with its sister sizes. Not sure 46B is right? Measure with the bra calculator first.

Reviewed by the 247Sizing teamLast updated: 27 August 2026
US 46B = UK 46B
EU 105B · French 120B

A US 46B bra converts to UK 46B, EU 105B and French 120B. The band number maps on a fixed scale, while cup letters shift between systems above D.

RegionSize
US46B
UK46B
EU (Europe)105B
FR / ES (France, Spain)120B

Sister sizes for 46B

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

44CSister down
48ASister 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.

44B · 48B · 46A · 46C

All bra sizes → · Bra calculator → · Converter →

What is a US 46B bra in UK and EU sizing?

A US 46B is a UK 46B, EU 105B and French 120B.

What are the sister sizes of 46B?

Same cup volume, different band: 44C, 48A.

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