Bra Size Converter
Bra Size Converter
Convert bra sizes between US, UK, EU, French & Australian systems
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Bra Size Converter: US, UK, EU, French & Australian Sizing
Bra sizes are not universal. A US 34D is a UK 34D, but a French 90D and an EU 75E — same bra, four different labels. Buying from an international brand without converting is the number-one reason bras arrive in the wrong size. This tool converts your exact band and cup between every major sizing system instantly.
Example: US 34D = UK 34D = EU 75D = FR 90D = AU 12D. Select your home size above to see the full chart and the exact size to order.
How Bra Sizing Works (Band + Cup)
Every bra size has two parts. The band is the number — it measures the circumference under your bust. The cup is the letter — it comes from the difference between your bust measurement and your band, where roughly each inch of difference is one cup up (1" = A, 2" = B, 3" = C, and so on).
The systems diverge in two ways: band units (the US & UK count inches, the EU counts centimetres, France adds 15 to the EU number) and cup letters (the US, UK and continental Europe label larger cups differently — a US DDD is a UK E and an EU F).
Band Conversion Reference
| US / UK (in) | EU (cm) | France | AU / NZ |
|---|---|---|---|
| 30 | 65 | 80 | 8 |
| 32 | 70 | 85 | 10 |
| 34 | 75 | 90 | 12 |
| 36 | 80 | 95 | 14 |
| 38 | 85 | 100 | 16 |
| 40 | 90 | 105 | 18 |
Cup Conversion Reference
| US | UK / AU | EU / France |
|---|---|---|
| C | C | C |
| D | D | D |
| DD | DD | E |
| DDD | E | F |
| G | F | G |
| H | FF | H |
Sister Sizes: Your Backup When a Size Sells Out
If your exact size is out of stock, sister sizes fit almost identically because they share the same cup volume. Go one band up and one cup down, or one band down and one cup up. For example, a 34D sister-sizes to 36C and 32DD.
The converter shows your sister sizes automatically — handy when the brand you want only stocks the adjacent size.