FR to US conversion

FR 80C in US Bra Size

Convert 80C from French sizing to US sizing, with the full international table, sister sizes, and practical fit checks in one place.

Instant answer

80C (FR) =

30C US

In this sizing table, 80C in French sizing converts to 30C in US sizing.

Full conversion table for 80C (US 30C)

30C bra size conversion across US, UK, EU, French, and Australian sizing.
US	UK	EU	FR	AU
30C	30C	65C	80C	8C

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 French size chart, use 30C as the closest US starting label for 80C. This is still a label translation, so brand grading, fabric, and wire shape can change the final fit.

Sister sizes for the US equivalent (30C)

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

What measurements make a 80C?

80C starts with the underbust, then adds cup depth from the bust measurement. In the current calculator formula, the closest starting range is about 29-31 inches (74-79 cm) under the bust and about 32.5-33.5 inches (83-85 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 30C as the US equivalent for those measurement notes.

Is 80C big or small?

The label 80C can look more dramatic than it fits, especially across systems. In this size set, the US equivalent uses a smaller 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 80C 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 80C differs between brands

Brand sizing matters for 80C 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 80C

A good shopping path for 80C 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.

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.

Placeholder for supportive everyday styles by band and cup.

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Soft Cup Edit

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FAQ

Is 80C the same as 30C in the US?

In this dataset, 80C (FR) converts to 30C 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 80C in Australian sizing?

80C (FR) matches the same base record as 8C (AU). The full table on this page shows each supported label side by side.

How do I check the fit of 30C?

Start with the band: it should feel firm and even around your ribcage. Then check cup containment, wire comfort, and whether the center gore lies close on wired styles.

What sister sizes work with 30C?

32B are the closest sister-size options for 30C 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 80C?

80C maps to US 30C here. The current calculator formula points to about 29-31 inches underbust and 32.5-33.5 inches bust, or roughly 74-79 cm and 83-85 cm. Treat that as a starting range and then check the real fit.