US to UK conversion

34A in UK Bra Size

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

Instant answer

34A (US) =

34A UK

In this sizing table, 34A in US sizing converts to 34A in UK sizing.

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 UK sizing

Use 34A 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 UK sizing

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

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

What this conversion means

If you searched for 34a in uk, the short answer is 34A. The full table shows the same US size across every supported system so you can compare retailer charts without opening several pages.

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?

For 34A, the band number gives the ribcage anchor and the cup describes the bust difference. 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 sits in context only when the number and letter are read as a pair. 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

A conversion points you to a label, but a brand chart tells you how that maker expects 34A to fit. 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

For 34A, practical shopping is less about one perfect style and more about reading the fit quickly. 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

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

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Comfort Band Co.

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Soft Cup Edit

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FAQ

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

Use 34A as the UK 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 French sizing?

In this same table, 34A converts to 90A (FR). That helps when a retailer shows a French chart instead of a UK 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.