US to AU conversion

38DD in Australian Bra Size

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

Instant answer

38DD (US) =

16DD AU

In this sizing table, 38DD in US sizing converts to 16DD in Australian sizing.

Need an Australian calculator?

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

Australian bra size calculator New Zealand calculator

Ready when you are

Not sure about your size? Recheck your measurements before comparing conversion labels.

Find my size

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 16DD 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 38DD

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

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

Sizes near 38DD in Australian sizing

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

What this conversion means

This page answers the specific 38dd australian size conversion using the site's shared sizing data. 16DD is the Australian label for 38DD here, and the table above keeps the other supported systems together for quick comparison.

Sister sizes for 38DD

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

What measurements make a 38DD?

A size like 38DD makes more sense when the two tape measurements are shown side by side. In the current calculator formula, the closest starting range is about 37-39 inches (94-99 cm) under the bust and about 42.5-43.5 inches (108-110 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 38DD big or small?

38DD should be treated as a fit label, not as a judgement about body size. In this size set, the US equivalent uses a fuller band and a fuller 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 38DD 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 38DD differs between brands

Use 38DD 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 38DD

Treat 38DD 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.

Bras in your size

Looking for 38DD? We may earn a commission if you buy through sponsored links.

Everyday Fit Store

Placeholder for a broad size range and return-friendly basics.

→

Comfort Band Co.

Placeholder for supportive everyday styles by band and cup.

→

Soft Cup Edit

Placeholder for wire-free and lounge options.

→

FAQ

Is 38DD in the US the same as Australian sizing?

Not exactly. 38DD is the US label, and this table converts it to 16DD in Australian sizing, though some brands publish their own charts.

What is 38DD in UK sizing?

In this same table, 38DD converts to 38DD (UK). That helps when a retailer shows a UK chart instead of a Australian one.

How do I know if 38DD fits?

Check that the band stays level, the cups do not spill or gap, and the center gore sits close if the bra has wires. If the cup feels right but the band feels wrong, try a sister size.

What sister sizes work with 38DD?

36DDD and 40D are the closest sister-size options for 38DD 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 38DD?

The current calculator formula points to about 37-39 inches underbust and 42.5-43.5 inches bust, or roughly 94-99 cm and 108-110 cm. Treat that as a starting range and then check the real fit.