UK to US bra size converter

Shopping from a brand in another country? UK and US band numbers match; a UK 34 becomes EU/JP 75, France 90 and AU 12. UK and US cups match up to DD, then the UK goes E, F, FF, G while the US goes DDD, G, H, I. Type your size and we'll translate it into all six labels.

34DDDUS · converted from UK 34E

UK: 34E
US: 34DDD
EU: 75F
FR: 90F
AU: 12E
JP (approx.): G75

After DD the letters split: UK 34E is US 34DDD.

Worked example: a UK 34E is a US 34DDD, which some US brands print as 34F. A 34F from one of those brands is a UK 34E, not a UK 34F.

Sister sizes of 34E Full international chart Brand charts How to measure your bra size

By Rai Ansar · Sizes computed by the Bra Atlas engine · Sources and checked dates · How the sizes are calculated

Compare six label systems, including different band numbers outside the UK and US. These are chart-label equivalents, not a guarantee that every brand fits the same.

UK and US cups, letter by letter

Each row is one inch more between bust and band. Rows where the UK and US letters differ are marked.

**The cup ladder**Same band, one inch per step. EU letters for comparison.
Bust minus band	UK	US	EU / FR
1 in	A	A	A
2 in	B	B	B
3 in	C	C	C
4 in	D	D	D
5 in	DD	DD	E
6 in	E	DDD (differs from UK)	F
7 in	F	G (differs from UK)	G
8 in	FF	H (differs from UK)	H
9 in	G	I (differs from UK)	I
10 in	GG	J (differs from UK)	J
11 in	H	K (differs from UK)	K
12 in	HH	L (differs from UK)	L
13 in	J	M (differs from UK)	M
14 in	JJ	N (differs from UK)	N
15 in	K	O (differs from UK)	O

Ladders from Wikipedia, "Bra size", cross-checked against A Bra That Fits' converter: we ran 18 measurement pairs through it in UK, US and EU labels on 25 September 2026, and our engine reproduces every answer (recorded outputs kept in our test fixtures, not published).

US to UK bra size: the ladder read from the US side

Start from the letter on a US tag. The band number stays the same; only the cup letter changes after DD. The G cup and H cup pages show both readings of those letters by band: a UK G is a US I, and a UK H is a US K.

**US cup to UK cup**AA to O on the US ladder. A US E or F alias is read as DD or DDD.
US	UK	EU / FR	Bust minus band
AA	AA	AA	0 in
A	A	A	1 in
B	B	B	2 in
C	C	C	3 in
D	D	D	4 in
DD	DD	E	5 in
DDD	E (differs from US)	F	6 in
G	F (differs from US)	G	7 in
H	FF (differs from US)	H	8 in
I	G (differs from US)	I	9 in
J	GG (differs from US)	J	10 in
K	H (differs from US)	K	11 in
L	HH (differs from US)	L	12 in
M	J (differs from US)	M	13 in
N	JJ (differs from US)	N	14 in
O	K (differs from US)	O	15 in

Common conversions past DD

See the letters side by side after UK and US labels split.

**UK sizes on other labels**Computed by the Bra Atlas engine. "Not in our table" is a limit of our converter, not of the country's sizes.
UK	US	EU	FR	AU	JP (approx.)
32E	32DDD	70F	85F	10E	G70
34F	34G	75G	90G	12F	H75
36FF	36H	80H	95H	14G	I80
30G	30I	65I	80I	8H	not in our table
38GG	38J	85J	100J	16HH	not in our table
32H	32K	70K	85K	not in our table	not in our table

Three things converters get wrong

US "E" and "F" are not UK E and F

Some US brands print E for DD and F for DDD. On those labels a US 34E is a UK 34DD, one cup smaller than a UK 34E. Our converter reads a US E as DD and a US F as DDD, and tells you when it did. If the US brand's chart runs D, DD, DDD, E, trust the brand chart. Victoria's Secret prints both names ("DD (E)", "DDD (F)"). SKIMS's cup table pairs US F with UK F, but its own size grid disagrees above DD. Do not use this converter's F alias for SKIMS: check the brand’s own sizing method.

Australian brands disagree above F

Australian bands are the UK band minus 22 (UK 34 is AU 12). Cups follow UK letters to F. Above F, Berlei's chart skips FF and GG and stops at H; A Bra That Fits' Australian output skips them too and continues to HH. Our converter uses that ladder. Freya and Wacoal keep FF and GG in their Australian rows. A UK 34FF becomes AU 12G here, but AU 12FF on those brand charts. Check the brand's own label.

Japanese cups run a letter ahead

Japan's JIS L 4006 ladder starts at AA for a 7.5 cm difference and uses 2.5 cm cup steps. Our chart starts at Japanese A, paired with UK AA, and does not convert Japanese AA. A US 34D converts approximately to E75 (OneMall, 2026). Converters disagree above DD, so JP outputs are marked approximate. Our table stops at I; Japanese brand charts can go further.

Quick answers

Are UK and US bra sizes the same?

Bands are the same number in both. Cups share letters up to DD. After that the UK goes E, F, FF, G, GG, H and the US goes DDD, G, H, I, J, so a UK 34E is a US 34DDD and a UK 34FF is a US 34H.

What is a UK 34E in US sizes?

US 34DDD. Some US brands print it as 34F, because they label DD as E and DDD as F.

What is a US 34DDD in UK sizes?

UK 34E. In EU sizes it is 75F, in France 90F, in Australia 12E.

Sources

Each source was opened and checked on the date shown, or on 25 September 2026. Where sources disagree, the page says so instead of picking one silently.

Wikipedia, "Bra size": UK and US cup ladders, the +4 method, EN 13402 and JIS cup steps
A Bra That Fits calculator (community calculator of r/ABraThatFits): we submitted 18 measurement pairs in 6 systems on 25 September 2026; raw synthetic fixture outputs are linked from the methodology
Berlei Australia, size charts: AU band = underbust row, cups A to H with no FF or GG
OneMall, "Japanese Bra Size Conversion" (11 September 2026): JIS cups in 2.5 cm steps; JP letter about one above the US letter
Freya, "International Bra Size Chart & Bra Sizing": band and cup tables in UK, EU, FR, AU/NZ, US and JP (opened 25 September 2026)
Wacoal, "International Size Guide": UK AA to GG paired with US AA to J; AUS/NZ keeps FF and GG; band and cup rows are separate, not a stock list (opened 13 October 2026)