What is a US 34B in EU sizing?

A US 34B is an EU 75B, a French 90B and an Australian 12B.

Why do UK cups differ above D?

UK sizing inserts DD, E, FF and G, while US sizing uses DD, DDD and then letters, so the scales diverge above a D cup.

How often should I re-measure?

Every six to twelve months, or after any significant change in weight or activity level.

Converters

Bra Size Converter

Band numbers and cup letters both change between countries — a US 34D is a French 90D and an Australian 12D. Convert directly, or enter your under-bust and over-bust measurements to calculate your size from scratch.

Bra size converter

US band

US cup

Or under-bust (cm)

Over-bust (cm)

34B (US)

34B

75B

11B

90B

75B

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How to use this converter

Measure snugly under the bust, keeping the tape level.
Measure around the fullest part of the bust without compressing.
Enter both measurements, or pick your known US band and cup.
Read the converted size for every supported country.

Why sizes differ between countries

Size labels come from national fit blocks developed decades ago from different population surveys. The US and UK use garment-based numbering, most of Europe derives sizes from body measurements in centimetres, and Japan, Korea and China use their own regional standards. Because no global standard exists, matching your measurements to the chart is always more reliable than matching the label.

Frequently asked questions

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