US to AU conversion

34A in Australian Bra Size

Convert 34A from US sizing to Australian sizing, with the full international table, nearby sister sizes, and fit checks in one place.

Instant answer

34A (US) =

12A AU

In this sizing table, 34A in US sizing converts to 12A in Australian 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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Sizing varies by brand

A conversion gives you the closest label in another sizing system, but brands can grade cups, wires, and bands differently. Use the converted size as a starting point, then check the retailer's chart and the fit of the actual bra.

Before you buy in Australian sizing

Use 12A as the translated label, not as a fit guarantee.
Check the retailer's size chart because some brands grade bands and cups differently.
If the cup volume feels close but the band changes, compare sister sizes before switching cup letters.
When possible, check return rules before buying across sizing systems.

Full conversion table for 34A

34A bra size conversion across US, UK, EU, French, and Australian sizing.
US	UK	EU	FR	AU
34A	34A	75A	90A	12A

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

Sizes near 34A in Australian sizing

If 34A is close but not right, these are the neighbouring US sizes and what each one becomes in Australian sizing. Band neighbours change the fit around the ribcage; cup neighbours change volume.

US sizes adjacent to 34A and their Australian equivalents.
US size	AU size	How it differs
32A	10A	One band step snugger, same cup letter.
36A	14A	One band step looser, same cup letter.
34B	12B	One cup step up, same band.

What this conversion means

This page answers the specific 34a australian size conversion using the site's shared sizing data. 12A is the Australian label for 34A here, and the table above keeps the other supported systems together for quick comparison.

Sister sizes for 34A

Sister sizes: 32B can be worth checking when the cup volume feels close but the band needs a different feel.

What measurements make a 34A?

34A is built from a band measurement and a bust measurement, not from the label alone. In the current calculator formula, the closest starting range is about 33-35 inches (84-89 cm) under the bust and about 34.5-35.5 inches (88-90 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.

Is 34A big or small?

34A is not automatically big or small; it depends on the band and the cup together. In this size set, the US equivalent uses a middle 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 34A 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 34A differs between brands

Two brands can print 34A or its equivalent on the tag and still cut the bra differently. 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 34A

When shopping for 34A, start with styles that make the band easy to judge. 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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Soft Cup Edit

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FAQ

Is 34A in the US the same as Australian sizing?

Use 12A as the Australian match for 34A in this dataset. The label may look similar in some systems, but it still belongs to a different sizing sequence.

What is 34A in European sizing?

In this same table, 34A converts to 75A (EU). That helps when a retailer shows a European chart instead of a Australian one.

How do I know if 34A fits?

A good fit should feel secure without digging. Watch for a band that rides up, cups that wrinkle, or straps carrying most of the support.

What sister sizes work with 34A?

32B are the closest sister-size options for 34A 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?

Countries and brands do not all use the same band labels or cup-letter sequence. A conversion translates the closest standard label, but the final fit still depends on the specific bra.

What measurements usually make 34A?

The current calculator formula points to about 33-35 inches underbust and 34.5-35.5 inches bust, or roughly 84-89 cm and 88-90 cm. Treat that as a starting range and then check the real fit.