Australian Bra Size Calculator

Use our free bra size calculator to find your perfect fit. Enter your measurements and get instant results in US, UK, EU, and 7+ international sizing systems.

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Results include US, UK, EU, FR, IT, AU, and JP sizes

Australian and New Zealand Bra Sizing Overview

Australia and New Zealand commonly use a band numbering system based on dress sizes — 8, 10, 12, 14, 16, and upward — paired with cup letters similar to UK grading in many brands. The numbers do not equal your underbust in centimeters the way EU 75/80 labels do; instead, AU/NZ band numbers relate to a sizing chart that maps body measurements to those dress-style figures. Understanding that relationship helps you shop local labels and convert when buying from US or UK retailers.

Our Australian bra size calculator converts your tape measurements into AU/NZ style estimates alongside US, UK, and EU references so you can compare tags without manual table lookups.

AU Band Numbers: 8, 10, 12, and Beyond

An AU size 12 band does not mean 12 inches or 12 cm underbust — it indicates a band category on Australian charts, often aligned with UK band logic in many conversion tables. Shoppers frequently see dual labeling (AU 12 / UK 34 / US 34) on tags from international brands sold in Australia. Always note which column a chart uses before ordering.

  • Lower AU numbers: Smaller band categories (8, 10) correspond to narrower underbust ranges on brand charts.
  • Mid range: 12, 14, 16 cover common retail sizes in AU/NZ stores.
  • Extended sizing: Many AU brands now offer fuller bust and plus ranges with consistent cup lettering.

How AU Sizing Relates to UK Sizing

Many Australian lingerie brands follow UK cup letter progression — DD, E, F, FF, G, and so on — because UK grading is widely used in Commonwealth markets. Band numbering differs in label appearance (AU 12 vs UK 34) while cup volume may track similarly when the brand uses UK-based charts. This is not universal: some mass-market lines simplify labeling. Use our UK bra size calculator when a tag lists British sizes, and our bra size conversion tool when you need side-by-side regional labels from one measurement session.

If you measure at home in inches or centimeters, enter values here rather than assuming your AU dress size equals bra band size — dress and bra charts serve different purposes.

Measuring for AU/NZ Size Estimates

Measure underbust snugly beneath the breast and bust at the fullest point, same as international fitting guides recommend. Enter readings in the calculator on this page; select your preferred unit if the widget offers a toggle. Review AU/NZ output together with US and UK equivalents to prepare for cross-border online shopping.

For technique details, read how to measure bra size. For cup-focused steps, see how to measure cup size.

Shopping US or EU Brands From Australia

US even band numbers (32, 34, 36) and EU centimeter bands (70, 75, 80) appear on international sites shipping to AU/NZ. Convert before checkout to reduce return cycles. Our US bra size calculator helps when American labeling dominates the product page.

Cup Letters in the AU Market

Cup volume still derives from bust minus band difference, mapped to letters. AU tags may show single and double letters consistent with UK systems at fuller bust sizes. Marketing names (for example, using DDD vs F) vary by importer. Treat letter output as approximate until you try the bra — wire width and cup shape differ across brands sold in Myer, David Jones, specialist boutiques, and online marketplaces alike.

Sister sizing works the same conceptual way in AU charts: adjust band and cup in opposite directions to hold volume roughly constant when the first calculated size feels close but not quite right.

Using This Australian Calculator

After measuring, use the embedded calculator or the main bra size calculator for a second opinion with multi-system output. Keep notes of which AU size worked in which brand; local and imported lines on the same rack can fit differently despite similar labels.

Re-measure after weight change, pregnancy, or fitness shifts — AU numbers change with your body the same way any regional label would.

Re-Measure and Track Changes

Life changes affect AU/NZ measurements the same way they do elsewhere. Re-measure if you notice cups gapping, wires sitting on breast tissue, or shoulder straps doing all the support work. Tracking underbust and bust readings every few months can reveal gradual shifts before your bras become obviously uncomfortable.

Seasonal shopping in AU/NZ often includes international brand drops — fresh measurements help you filter online inventory without relying on an old tag from a different labeling system.

Brand Variance Disclaimer

BraSizeHelper provides educational size estimates and is not affiliated with Australian or New Zealand retailers or manufacturers. AU/NZ sizing practices vary by brand, especially where US imports use sticker conversions. Charts on this site reflect common conversion paths; confirm fit with try-ons and each brand’s published size guide when available.

AU Sizing Next Steps