AU to US conversion

AU 10A in US Bra Size

Convert 10A from Australian sizing to US sizing, with the full international table, sister sizes, and practical fit checks in one place.

Instant answer

10A (AU) =

32A US

In this sizing table, 10A in Australian sizing converts to 32A in US sizing.

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If you are starting from body measurements instead of a known label, use the AU/NZ calculator with centimetres selected by default.

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Full conversion table for 10A (US 32A)

32A bra size conversion across US, UK, EU, French, and Australian sizing.
US	UK	EU	FR	AU
32A	32A	70A	85A	10A

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

What this conversion means

If you are shopping from a Australian size chart, use 32A as the closest US starting label for 10A. This is still a label translation, so brand grading, fabric, and wire shape can change the final fit.

Sister sizes for the US equivalent (32A)

Sister sizes: 30B can be worth checking when the cup volume feels close but the band needs a different feel.

What measurements make a 10A?

A size like 10A makes more sense when the two tape measurements are shown side by side. In the current calculator formula, the closest starting range is about 31-33 inches (79-84 cm) under the bust and about 32.5-33.5 inches (83-85 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 32A as the US equivalent for those measurement notes.

Is 10A big or small?

10A should be treated as a fit label, not as a judgement about body size. 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 10A 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 10A differs between brands

Use 10A as the starting label, then let the individual brand chart narrow the choice. 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 10A

Treat 10A as your anchor size while you compare cup shape, strap placement, and band feel. 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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Everyday Fit Store

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FAQ

Is 10A the same as 32A in the US?

In this dataset, 10A (AU) converts to 32A 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 10A in French sizing?

10A (AU) matches the same base record as 85A (FR). The full table on this page shows each supported label side by side.

How do I check the fit of 32A?

A good US fit should feel secure without digging. If 32A feels close in the cup but wrong in the band, compare the sister sizes before changing cup volume.

What sister sizes work with 32A?

30B are the closest sister-size options for 32A in this dataset. Try a sister size when cup volume feels close but the band needs to feel snugger or looser.

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 10A?

10A maps to US 32A here. The current calculator formula points to about 31-33 inches underbust and 32.5-33.5 inches bust, or roughly 79-84 cm and 83-85 cm. Treat that as a starting range and then check the real fit.