US to AU conversion

38C in Australian Bra Size

Convert 38C from US sizing to Australian sizing, with the full international table, nearby sister sizes, and fit checks in one place.

Instant answer

38C (US) =

16C AU

In this sizing table, 38C in US sizing converts to 16C 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 16C 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 38C

38C bra size conversion across US, UK, EU, French, and Australian sizing.
US	UK	EU	FR	AU
38C	38C	85C	100C	16C

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

Sizes near 38C in Australian sizing

If 38C 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 38C and their Australian equivalents.
US size	AU size	How it differs
36C	14C	One band step snugger, same cup letter.
40C	18C	One band step looser, same cup letter.
38B	16B	One cup step down, same band.
38D	16D	One cup step up, same band.

What this conversion means

For 38C, the band stays tied to the 38 US band while the label is translated into Australian sizing. In this dataset, 38C (US) converts to 16C (AU). Treat that as the starting label, then check the brand chart and the real fit.

Sister sizes for 38C

Sister sizes: 36D and 40B can be worth checking when the cup volume feels close but the band needs a different feel.

What measurements make a 38C?

38C starts with the underbust, then adds cup depth from the bust measurement. In the current calculator formula, the closest starting range is about 37-39 inches (94-99 cm) under the bust and about 40.5-41.5 inches (103-105 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 38C big or small?

The label 38C can look more dramatic than it fits, especially across systems. In this size set, the US equivalent uses a fuller band and a middle 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 38C 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 38C differs between brands

Brand sizing matters for 38C 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 38C

A good shopping path for 38C 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 38C in the US the same as Australian sizing?

Use 16C as the Australian match for 38C in this dataset. The label may look similar in some systems, but it still belongs to a different sizing sequence.

What is 38C in European sizing?

In this same table, 38C converts to 85C (EU). That helps when a retailer shows a European chart instead of a Australian one.

How do I know if 38C 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 38C?

36D and 40B are the closest sister-size options for 38C 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 38C?

The current calculator formula points to about 37-39 inches underbust and 40.5-41.5 inches bust, or roughly 94-99 cm and 103-105 cm. Treat that as a starting range and then check the real fit.