Bra Size Converter: US, UK, EU, FR, AU, JP and KR

A US 34DDD is a UK 34E, an EU 75F, a French 90F and a Japanese F75. Same body, five labels. Pick the system you already know your size in below and read the equivalent in the other six at once.

Band numbers convert by arithmetic and never surprise anyone. Cup letters are where the systems genuinely disagree, because each one ran out of alphabet in a different place. The tables further down show exactly where they part company.

I know my size in

Equivalent in every system

US	UK	EU	FR	AU	JP	KR
34C	34C	75C	90C	12C	D75	D75

Cup letters diverge between systems after D, which is why a UK FF has no direct US letter and why converted sizes are starting points. When a brand publishes its own chart, trust the centimeters over the converted letter.

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How the band converts

The band is the reliable half. A US 34 is a UK 34, an EU 75, a French 90, an Australian 12 and a Japanese 75. Europe labels the band in centimetres rounded to fives, France adds 15 to the European number, and Australia uses its dress-size numbering, which is the US band minus 22. None of these involve judgement: given one band, the other six follow.

The one trap is that a French tag and a European tag can print the same number for two bands that are 15 apart. If a label just says 85 and the brand is French, it is an EU 70.

How the cup converts, and where it breaks

Cups match through D and diverge immediately after. The US stacks D into DD and DDD before jumping to G. The UK inserts E, F, FF, G, GG, so it can describe the same range more precisely. Europe runs single letters straight through: E, F, G, H. The result is that a US DDD, a UK E and an EU F all name roughly the same volume, and a UK FF has no direct US equivalent at all.

Japan and Korea add one more shift: their letters run about one letter fuller than European for the same measurement, and the label prints the cup before the band. Many EU B wearers buy a JP C75.

Because of this, a conversion is a starting size rather than a guarantee. Where a brand publishes its own centimetre chart, that chart beats any converted label.

The conversions people look up most, answered

What is a US 34DD in UK and EU sizing?

A US 34DD is a UK 34DD and an EU 75E. In France it is labelled 90E, in Australia 12DD, and in Japan and Korea F75.

What is a US 34DDD in UK and EU sizing?

A US 34DDD is a UK 34E and an EU 75F. In France it is labelled 90F, in Australia 12E, and in Japan and Korea G75.

What is a US 36DDD in UK and EU sizing?

A US 36DDD is a UK 36E and an EU 80F. In France it is labelled 95F, in Australia 14E, and in Japan and Korea G80.

What is a US 32D in UK and EU sizing?

A US 32D is a UK 32D and an EU 70D. In France it is labelled 85D, in Australia 10D, and in Japan and Korea E70.

What is a US 38DD in UK and EU sizing?

A US 38DD is a UK 38DD and an EU 85E. In France it is labelled 100E, in Australia 16DD, and in Japan and Korea F85.

What is a US 36G in UK and EU sizing?

A US 36G is a UK 36F and an EU 80G. In France it is labelled 95G, in Australia 14F, and in Japan and Korea H80.

One body, seven labels: a worked example

A 74 cm underbust with a 96 cm bust is a difference of 9.8 inches, which puts the cup at index 10 on the ladder. That one measurement is printed seven different ways depending on where the bra was made:

US	UK	EU	FR	AU	JP	KR
28J	28GG	60J	75J	6GG	K60	K60

Nothing about the body changed between those seven cells. Only the naming convention did, which is the whole reason a converter exists.

Full conversion matrix

The sizes searched most often, in every system at once. Band numbers are arithmetic; the cup letters are where the systems disagree.

US	UK	EU	FR	AU	JP	KR
32B	32B	70B	85B	10B	C70	C70
32D	32D	70D	85D	10D	E70	E70
32DD	32DD	70E	85E	10DD	F70	F70
34B	34B	75B	90B	12B	C75	C75
34C	34C	75C	90C	12C	D75	D75
34D	34D	75D	90D	12D	E75	E75
34DD	34DD	75E	90E	12DD	F75	F75
34DDD	34E	75F	90F	12E	G75	G75
36C	36C	80C	95C	14C	D80	D80
36D	36D	80D	95D	14D	E80	E80
36DD	36DD	80E	95E	14DD	F80	F80
36DDD	36E	80F	95F	14E	G80	G80
38D	38D	85D	100D	16D	E85	E85
38DD	38DD	85E	100E	16DD	F85	F85
38DDD	38E	85F	100F	16E	G85	G85
40D	40D	90D	105D	18D	E90	E90
40DD	40DD	90E	105E	18DD	F90	F90

Why the cup letters stop matching after D

Every row below is the same cup volume. The three systems simply ran out of alphabet in different places: the US stacks D into DD and DDD, the UK inserts doubled letters, and Europe keeps going in single letters.

Difference	US	UK	EU / FR
4" over the band	D	D	D
5" over the band	DD	DD	E
6" over the band	DDD	E	F
7" over the band	G	F	G
8" over the band	H	FF	H
9" over the band	I	G	I
10" over the band	J	GG	J
11" over the band	K	H	K

The brand is the last conversion step

A converted label still has to survive the brand that printed it. These are the houses whose cut differs enough from their own tag to matter:

Brand	How it runs	What to do
Victoria's Secret	Cups run about half a size shallow and bands stretch generous.	Start with your measured size; if between cups, size the cup up.
Freya	True-to-measure UK sizing with firm bands and deeper cups.	Use your measured UK size; band feel is snugger than US mall brands.
Wacoal	Consistent and true to size with slightly taller cup profiles.	Measured size works for most; slender shapes may prefer a demi cut.
ThirdLove	Runs true with half-cup sizes available between letters.	If your difference lands between inches, their half cups fit that gap.
Skims	Stretch fabrics run compressive; bands feel a size firmer.	Consider one band size up from your measured size for lounge styles.
Savage X Fenty	Bands run snug and cup depth is shallower than UK brands.	Sister size up in the band if you are between sizes.
Marks & Spencer	True UK sizing with slightly generous bands on unlined styles.	Measured UK size; go down a band in unlined cotton styles.
Bravissimo	D-K specialist cut with deep, projected cups and firm bands.	Projected shapes fit measured size; shallow shapes size the cup down.
Chantelle	French sizing with elegant shallow-to-average cup depth.	Convert to FR sizing and expect a slightly shallower cup.
Fantasie	UK full-bust cut, deep cups, supportive firm bands.	Measured UK size; the band will feel firm on first wear, which is correct.

The brand size decoder covers the full list.

Five mistakes that ruin a cross-border order

Converting twice. A retailer that auto-converts to your local system has already rounded once. Converting that result again can move you a full size. Convert from the brand's own home-market chart, once.
Reading a French band as European. France adds 15 to the EU number, so an 85 tag is either an EU 85 or a FR 85, which is an EU 70 — two bands apart. Nothing on the label always says which; the country of origin usually does.
Assuming a Japanese letter matches a Western one. Japanese cups run about a letter fuller for the same measurement, and the label prints cup first: C75, not 75C.
Adding four inches to the underbust. The +4 method was written for non-stretch fabric. On a modern elastic band it produces a band two sizes too loose and a cup too small to compensate.
Trusting the letter over the centimetres. If a listing publishes a centimetre chart anywhere, match your tape to that and ignore the letters entirely. The measurement is the only thing that does not change between systems.

Frequently asked questions

What is a US 34DDD in UK and EU sizing?

A US 34DDD is a UK 34E and an EU 75F. In France it is a 90F, in Australia a 12E and in Japan and Korea an F75. The three ladders name the same volume differently because they diverge after D.

What is a UK 32F in US sizing?

A UK 32F is a US 32G. The US ladder skips E and F entirely, going D, DD, DDD and then G, so UK letters past D always sit one or more places ahead of their US equivalent.

Why is my French size 15 higher than my EU size?

French sizing adds 15 to the European band number by convention: an EU 75 is a FR 90, an EU 80 is a FR 95. The cup letters are the same in both.

Is a Japanese C cup the same as a US C cup?

No. Japanese cup letters run about one letter fuller than Western ones for the same measurements, so a JP C is close to a US or EU B. Japanese labels also print the cup before the band, as in C75 rather than 75C.

How do I convert an EU bra size to US?

Subtract the band: divide the EU number by 2.5 and add 4, so EU 75 becomes US 34 and EU 80 becomes US 36. Then move the cup letter down the ladder: EU E is US DD, EU F is US DDD, EU G is US G.

Which measurement should I trust when a converted size does not fit?

The centimetre measurement, every time. Letters are conventions that vary by country and by brand; your underbust and bust measurements do not change. If a listing publishes a centimetre chart, match your tape to it and ignore the letters.

Do I add inches to my underbust measurement?

No. The old +4 method was designed for non-stretch fabrics and is still printed on some store charts. On a modern elastic band it produces a band about two sizes too loose. Measure snug and level, and use that number as the band.

Next steps

Last updated August 2026.