Bra Size Converter
US, UK, EU & FR band and cup sizes.
Enter band and cup together, e.g. 34C, 75C or 90D. Don't know your size? Use the measurement calculator below.
Measure your underbust snugly and your bust at the fullest point. Band = underbust, cup = bust − underbust.
Tap any card to copy that size.
This free bra size converter translates band and cup sizes across seven systems: US/Canada, UK, European, French/Spanish/Belgian, Australian/NZ, Italian and Japanese/Korean. Band numbers differ (a US 34 is an EU 75, an FR 90, an AU 12 and an IT 3) and cup letters diverge above D, which this converter handles per region. Enter a size you already know, or use the measurement calculator to find your size from an underbust and bust measurement in centimetres or inches.
It also lists sister sizes — nearby band/cup combinations with the same cup volume (a 34C, 32D and 36B all share a cup). Sister sizes are useful when your usual size runs tight or loose in a given brand: go down a band and up a cup, or up a band and down a cup. Fit still varies by brand and style, so treat every result as a starting point.
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