UK to US conversion

UK 38A in US Bra Size

Convert 38A from UK sizing to US sizing, with the full international table, sister sizes, and practical fit checks in one place.

Instant answer

38A (UK) =

38A US

In this sizing table, 38A in UK sizing converts to 38A in US sizing.

Full conversion table for 38A (US 38A)

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

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 UK size chart, use 38A as the closest US starting label for 38A. This is still a label translation, so brand grading, fabric, and wire shape can change the final fit.

Sister sizes for the US equivalent (38A)

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

What measurements make a 38A?

A size like 38A 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 38.5-39.5 inches (98-100 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 38A as the US equivalent for those measurement notes.

Is 38A big or small?

38A 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 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 38A 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 38A differs between brands

Use 38A 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 38A

Treat 38A 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

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Everyday Fit Store

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Comfort Band Co.

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Soft Cup Edit

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FAQ

Is 38A the same as 38A in the US?

In this dataset, 38A (UK) converts to 38A 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 38A in Australian sizing?

38A (UK) matches the same base record as 16A (AU). The full table on this page shows each supported label side by side.

How do I check the fit of 38A?

A good US fit should feel secure without digging. If 38A feels close in the cup but wrong in the band, compare the sister sizes before changing cup volume.

What sister sizes work with 38A?

36B are the closest sister-size options for 38A 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 38A?

38A maps to US 38A here. The current calculator formula points to about 37-39 inches underbust and 38.5-39.5 inches bust, or roughly 94-99 cm and 98-100 cm. Treat that as a starting range and then check the real fit.