AU Size 18B in US — Women's Bras
AU 18B =
US 40B
Australian (AU) women's bras size 18B converts to United States (US) size 40B. This is a standard conversion used across most major bras brands and retailers.
When shopping from United States brands like Victoria's Secret, ThirdLove, Wacoal, look for size 40B on the label. Keep in mind that sizing can vary slightly between brands, so always check the specific brand's size chart if available.
For reference, one size down (AU 18A) is US 40A, and one size up (AU 18C) is US 40C. If you're between sizes, most fitting guides recommend sizing up for comfort.
This conversion is especially useful for international shoppers purchasing women's from United States retailers or ordering Australian-sized products from brands like Berlei or Bonds to ship internationally.
Quick Converter
AU 18B =
US 40B
Full AU to US Women's Bras Size Chart
| AU | US |
|---|---|
| 8A | 30A |
| 8B | 30B |
| 8C | 30C |
| 8D | 30D |
| 8DD | 30DD |
| 10A | 32A |
| 10B | 32B |
| 10C | 32C |
| 10D | 32D |
| 10DD | 32DD |
| 10E | 32DDD |
| 12A | 34A |
| 12B | 34B |
| 12C | 34C |
| 12D | 34D |
| 12DD | 34DD |
| 12E | 34DDD |
| 14A | 36A |
| 14B | 36B |
| 14C | 36C |
| 14D | 36D |
| 14DD | 36DD |
| 14E | 36DDD |
| 16A | 38A |
| 16B | 38B |
| 16C | 38C |
| 16D | 38D |
| 16DD | 38DD |
| 16E | 38DDD |
| 18A | 40A |
| 18B | 40B |
| 18C | 40C |
| 18D | 40D |
| 18DD | 40DD |
| 18E | 40DDD |
| 20A | 42A |
| 20B | 42B |
| 20C | 42C |
| 20D | 42D |
| 20DD | 42DD |
| 20E | 42DDD |
Frequently Asked Questions
- What is AU women's bras size 18B in US?
- AU women's bras size 18B is equivalent to US size 40B.
- Is AU size 18B the same as US size 40B?
- Yes, AU size 18B and US size 40B are equivalent in women's bras sizing. However, fit may vary slightly between brands.
- What if AU size 18B is too small — what's the next size up in US?
- The next size up from AU 18B is AU 18C, which converts to US 40C.