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38C Bra Size — UK, EU & French Conversion

A US 38C bra in UK, European and French sizing, with its sister sizes. Not sure 38C is right? Measure with the bra calculator first.

Reviewed by the 247Sizing teamLast updated: 27 August 2026
US 38C = UK 38C
EU 85C · French 100C

A US 38C bra converts to UK 38C, EU 85C and French 100C. The band number maps on a fixed scale, while cup letters shift between systems above D.

RegionSize
US38C
UK38C
EU (Europe)85C
FR / ES (France, Spain)100C

Sister sizes for 38C

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

36DSister down
40BSister 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.

36C · 40C · 38B · 38D

All bra sizes → · Bra calculator → · Converter →

What is a US 38C bra in UK and EU sizing?

A US 38C is a UK 38C, EU 85C and French 100C.

What are the sister sizes of 38C?

Same cup volume, different band: 36D, 40B.

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