UK vs US Bra Size Conversion: The Complete Chart

UK full-bust brands like Panache, Freya, Fantasie, and Elomi use UK sizing. Here is exactly how to convert their sizes to US and back, band and cup.

Last updated: July 2026 · Band + cup conversion · Both directions

Some of the best full-bust brands are British, so if you want proper support above a DDD, you will end up buying UK sizes. The good news: the band numbers are almost identical, and only the cup letters need converting. Get the cup right and a UK bra fits exactly as it should.

The two things to know: US band numbers equal UK band numbers (a US 34 band is a UK 34 band), and above a D the cup letters diverge, because the US repeats D's while the UK moves into single letters sooner.

Band Size Conversion

Bands are the easy part: the number is the same in both systems.

US band	UK band
28	28
30	30
32	32
34	34
36	36
38+	38+ (same number)

US and UK band numbers match. Only the cup letters need converting.

Cup Size Conversion (US to UK)

Up to a D the letters match. Above a D they diverge. This is approximate: brands vary, so confirm with the brand's chart or our size translator.

US cup	UK cup
A, B, C, D	A, B, C, D (same)
DD	DD
DDD / E	E
DDDD / F	F
G	FF
H	G
I	GG
J	H
K	HH
L	J

Approximate. The UK skips 'I'. Cup volume depends on the band too, so always confirm with the brand.

How to Buy a UK Brand

Keep your band number

Your US band number is your UK band number. A US 34 band stays a 34 in Panache, Freya, Fantasie, or Elomi.

Convert the cup letter

Use the chart above. A US 34DDD becomes roughly a UK 34E; a US 34H becomes roughly a UK 34G.

Try your sister sizes

If the exact converted size feels off, the sister size (band down + cup up, or band up + cup down) keeps the same cup volume.

Use the size translator

Our /size-translator converts your size across 33 brands with a confidence score, so you do not have to guess the cup letter.

Remember cup volume is relative to the band: a 32F and a 36F are different volumes. When you change the band during a conversion, change the cup letter to match (sister sizing). BraFinder's /methodology page documents how we translate every size across brands.

Frequently Asked Questions

How do I convert UK bra size to US?

Keep the band number the same (a UK 34 is a US 34), and convert the cup letter. Up to a D the letters match. Above a D, a UK E is about a US DDD, a UK F is about a US DDDD, a UK FF is about a US G, a UK G is about a US H, and so on. It is approximate because brands vary, so confirm with the brand's chart.

Is a US 34DD the same as a UK 34DD?

Yes, up to and including DD the US and UK cup letters match, and the band numbers are always the same. So a US 34DD and a UK 34DD are the same size. The systems only diverge above a DD, where the US adds DDD and DDDD while the UK moves into E, F, FF.

What is a UK G cup in US sizing?

A UK G cup is approximately a US H cup, on the same band. The UK order above D is E, F, FF, G, so a UK G is the fourth step above D, which lines up with about a US H. It is approximate and brand-dependent, so use it as a starting point and confirm with the specific brand.

Do UK and US band sizes differ?

No, the band numbers are the same. A US 32 band is a UK 32 band, a US 36 is a UK 36, and so on. Only the cup letters differ between the two systems, and only above a D cup. That makes converting to a UK brand simple: keep your band, convert the cup.

Why do British bra brands use different sizes?

The UK developed its own cup-lettering system that switches to single letters sooner and doubles them at half-steps (DD, FF, GG), while the US repeats D's (DD, DDD, DDDD). British full-bust brands like Panache, Freya, Fantasie, and Elomi use UK sizing, so you convert the cup letter, keep the band number, and they fit just as well.

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