US 40A to AU/NZ Bra Size
Conversion
US 40A = AU/NZ 18A
Sister sizes (same fit if your size is sold out):
20AA · 16B
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Full conversion chart
| Region | Size |
|---|---|
| US | 40A |
| UK | 40A |
| EU | 90A |
| France | 105A |
| AU/NZ | 18A |
About this conversion
A US 40A converts to a AU/NZ 18A. Bra sizes have two parts — the band (number) and the cup (letter) — and both are labelled differently across regions, which is why the same bra carries a different size in each country. Always check the brand's own size guide too, as cup grading varies between manufacturers.
If AU/NZ 18A is out of stock, the sister sizes above fit almost identically because they share the same cup volume.