AU to US conversion

AU 8A in US Bra Size

Convert 8A from Australian sizing to US sizing, with the full international table, sister sizes, and practical fit checks in one place.

Instant answer

8A (AU) =

30A US

In this sizing table, 8A in Australian sizing converts to 30A in US sizing.

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Full conversion table for 8A (US 30A)

30A bra size conversion across US, UK, EU, French, and Australian sizing.
US	UK	EU	FR	AU
30A	30A	65A	80A	8A

Bra sizing varies between brands. Use this as an accurate starting point and check the fit.

What this conversion means

8A is the Australian label in this dataset, and it points back to 30A in US sizing. The band number may change a lot between systems, especially for EU and French labels, but the table keeps the intended fit target together.

Sister sizes for the US equivalent (30A)

Sister sizes: No in-range sister sizes are available for this edge size. Try the sister size finder for the nearest supported options.

What measurements make a 8A?

8A starts with the underbust, then adds cup depth from the bust measurement. In the current calculator formula, the closest starting range is about 29-31 inches (74-79 cm) under the bust and about 30.5-31.5 inches (77-80 cm) around the fullest part of the bust. The band comes from the underbust rounding, while the cup step comes from the difference between bust and band. This page uses 30A as the US equivalent for those measurement notes.

Is 8A big or small?

The label 8A can look more dramatic than it fits, especially across systems. In this size set, the US equivalent uses a smaller band and a lower cup step. Cup letters are relative to the band, so a D on one band is not the same volume as a D on every other band. The most useful question is whether the band stays level and the cups hold smoothly, not whether the label sounds large or small.

If 8A doesn't fit right

Band rides up: The band may be too loose or stretched out; try a snugger band or compare the snugger sister size.

Cups gape: The cup may be too roomy, too deep, or pulled away by a loose band; check the band before changing cup volume.

Cups spill: The cup volume may be too small or the cup shape may be too closed; try one cup step up before changing the band.

Straps dig in: The straps may be compensating for a band that is not supporting enough; reset the band fit before tightening straps.

How 8A differs between brands

Brand sizing matters for 8A because cup depth, wire width, and band stretch are design choices. A firmer elastic can make the same band feel smaller, and a shallow or narrow cup can make the same cup letter feel different. Check the retailer chart, read fit notes when available, and compare the label against the brand and region sizing guide before treating the conversion as final.

Shopping for 8A

A good shopping path for 8A starts with everyday support, then moves into outfit-specific shapes. If the cup is in a lower or middle step, lightly lined T-shirt styles can make gaps easy to spot. Fuller cup steps often benefit from styles with steadier side support, deeper cups, or a balconette shape depending on breast shape. For special outfits, compare the fit needs in the outfit guides before choosing a strapless, plunge, or backless option.

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FAQ

Is 8A the same as 30A in the US?

In this dataset, 8A (AU) converts to 30A in US sizing. Some brands publish their own charts, so use this as the closest standard label and still check the real fit.

What is 8A in UK sizing?

8A (AU) matches the same base record as 30A (UK). The full table on this page shows each supported label side by side.

How do I check the fit of 30A?

Check that the band stays level, the cups sit smoothly without spilling or gapping, and the straps are not doing all the support work. The converted US size is a starting point, not a guarantee.

What sister sizes work with 30A?

No in-range sister sizes are available for 30A in this dataset. If the band or cup feels off, recheck your measurements and compare the nearest supported sizes.

Why do bra sizes differ between countries?

Bra labels are written differently across US, UK, EU, French, and Australian systems. Cup letters can also diverge after D, so a converted label is a starting point rather than a promise of identical fit.

What measurements usually make 8A?

8A maps to US 30A here. The current calculator formula points to about 29-31 inches underbust and 30.5-31.5 inches bust, or roughly 74-79 cm and 77-80 cm. Treat that as a starting range and then check the real fit.