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44D Bra Size — UK, EU & French Conversion

A US 44D bra in UK, European and French sizing, with its sister sizes. Not sure 44D is right? Measure with the bra calculator first.

Reviewed by the 247Sizing teamLast updated: 27 August 2026
US 44D = UK 44D
EU 100D · French 115D

A US 44D bra converts to UK 44D, EU 100D and French 115D. The band number maps on a fixed scale, while cup letters shift between systems above D.

RegionSize
US44D
UK44D
EU (Europe)100D
FR / ES (France, Spain)115D

Sister sizes for 44D

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

42DDSister down
46CSister 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.

42D · 46D · 44C · 44DD

All bra sizes → · Bra calculator → · Converter →

What is a US 44D bra in UK and EU sizing?

A US 44D is a UK 44D, EU 100D and French 115D.

What are the sister sizes of 44D?

Same cup volume, different band: 42DD, 46C.

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