US Bra Size to AU Conversion Guide
Swap US bands for the Australian 6–32 scale and keep cup depth aligned with UK-style lettering. Follow the chart, examples, and brand notes to buy Aussie bras without guesswork.
Covers US bands 28–52 and Australian bands 6–32 with cups AA through K.
Australian bands step by two
US 30 becomes AU 8, US 32 becomes AU 10, and so on up the scale.
Double letters stay in play
Australia follows the UK pattern, so DD, E, F, FF, G, GG remain part of the size range.
Know your retailer
Some Australian sites list both AU and US sizes—use the AU column when converting from US labels.
US to AU band and cup mapping
Convert your US band to the 6–32 Australian scale and keep the corresponding cup letter.
| US label | AU label | Notes |
|---|---|---|
| 28AA | 6AA | US 28AA converts to AU 6AA on a two-step band scale. |
| 28A | 6A | US 28A converts to AU 6A on a two-step band scale. |
| 28B | 6B | US 28B converts to AU 6B on a two-step band scale. |
| 28C | 6C | US 28C converts to AU 6C on a two-step band scale. |
| 28D | 6D | US 28D converts to AU 6D on a two-step band scale. |
| 28DD | 6DD | US 28DD converts to AU 6DD on a two-step band scale. |
| 28DDD | 6E | US 28DDD converts to AU 6E on a two-step band scale. |
| 28G | 6F | US 28G converts to AU 6F on a two-step band scale. |
| 28H | 6FF | US 28H converts to AU 6FF on a two-step band scale. |
| 28I | 6G | US 28I converts to AU 6G on a two-step band scale. |
| 28J | 6GG | US 28J converts to AU 6GG on a two-step band scale. |
| 28K | 6H | US 28K converts to AU 6H on a two-step band scale. |
| 30AA | 8AA | US 30AA converts to AU 8AA on a two-step band scale. |
| 30A | 8A | US 30A converts to AU 8A on a two-step band scale. |
| 30B | 8B | US 30B converts to AU 8B on a two-step band scale. |
| 30C | 8C | US 30C converts to AU 8C on a two-step band scale. |
| 30D | 8D | US 30D converts to AU 8D on a two-step band scale. |
| 30DD | 8DD | US 30DD converts to AU 8DD on a two-step band scale. |
| 30DDD | 8E | US 30DDD converts to AU 8E on a two-step band scale. |
| 30G | 8F | US 30G converts to AU 8F on a two-step band scale. |
| 30H | 8FF | US 30H converts to AU 8FF on a two-step band scale. |
| 30I | 8G | US 30I converts to AU 8G on a two-step band scale. |
| 30J | 8GG | US 30J converts to AU 8GG on a two-step band scale. |
| 30K | 8H | US 30K converts to AU 8H on a two-step band scale. |
Convert your size in four steps
- Confirm your US starting size Measure snug underbust and bust or pick a US bra that already fits well.
- Replace the band with the AU number Use the chart to translate the inches-based band to the Australian 6–32 system.
- Check sister sizes if needed If the AU band feels different, shift to the neighbouring band and adjust the cup with a sister size.
- Verify fabrics and wires Australian brands often follow UK construction—try nearby sizes before removing swing tags.
Worked conversion examples
US 30DD -> AU 8DD
US 30DD translates to AU 8DD with the same cup depth.
US 32F -> AU 10F
US 32F becomes AU 10F—just relabel the band.
US 34DD -> AU 12DD
US 34DD converts to AU 12DD for staples from Berlei or Bendon.
US 36G -> AU 14G
US 36G maps to AU 14G when shopping high-support Aussie styles.
Brand sizing cheat sheet
Use these notes to bridge American labels and Australian tags.
US-based retailers
- Nordstrom
- Bare Necessities
- HerRoom
- Amazon US
Convert before ordering AU brands from Nordstrom, Bare Necessities, or other US marketplaces.
Australian labels
- Bras N Things
- City Chic
- Berlei
- Bendon
Bras N Things, City Chic, Berlei, and Bendon publish AU sizes first, with UK/US references secondary.
Global marketplaces
- THE ICONIC
- David Jones
- Amazon AU
- Figleaves
Retailers like THE ICONIC and David Jones list AU sizes but often display US conversions in size guides.
Fit tips after converting
- Remember AU bands increase by two—use sister sizes if you need a tighter or looser fit.
- UK-derived cups can run firm; read fabric notes for sports bras and high-support styles.
- Save both AU and US labels in your fit notes to make reorders quick.
Helpful tools
Interactive bra size calculator
Measure in inches or centimetres and generate both local and international sizes in one place.
OpenInternational bra size guide
Compare regional systems side by side and review conversion advice for cross-border shopping.
OpenSister size navigator
Adjust bands tighter or looser while holding cup volume steady after you convert.
OpenUS to AU conversion FAQ
How do Australian band numbers compare to US?
Australian bands start at 6 and increase by twos. Use the chart to match each US band to its AU partner.
Do Australian cups use double letters?
Yes. AU sizing follows the UK-style sequence, keeping DD, E, F, FF, and so on. Match the cup shown in the table.
What if the converted band feels different?
Switch to the neighbouring AU band and adjust the cup using sister sizes just as you would in the US.
Where can I buy Australian-sized bras?
Australian retailers like Bras N Things and City Chic plus sites such as THE ICONIC or Amazon AU stock AU-labelled bras.