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

A US 34DD is a UK 34DD and an EU 75E. The band converts by ladder (US 34 = EU 75) and the cup converts by position: DD is the fifth cup in both the US and UK ladders, and the fifth EU cup is E. French brands label the same bra 90E and Australian brands label it 12DD.

Is a UK bra size the same as a US bra size?

The band number is identical: a US 34 band is a UK 34 band. Cups match up through D and also at DD, then split: a US DDD is a UK E, a US G is a UK F, and a US H is a UK FF. So a US 36DDD and a UK 36E are the same bra with different letters on the tag.

How do EU bra bands relate to US bands?

EU bands run on a centimeter ladder in steps of 5: US 28 = EU 60, US 32 = EU 70, US 36 = EU 80, US 40 = EU 90, US 44 = EU 100. Each 2-size US step is one 5 cm EU step. French and Spanish sizes use the same ladder shifted up by 15, so an EU 75 is a FR 90.

Why does a DDD cup become an E or an F in other countries?

Because above a D cup there is no shared standard. Each country kept extending its own ladder: the US repeated letters (DD, DDD), the UK mixed repeats and new letters (DD, E, F, FF), and the EU simply continued the alphabet (E, F, G, H). The volume is the same; only the label changes. That is why a US DDD, a UK E, and an EU F are one cup.

What is a sister size and does this converter handle it?

A sister size trades band for cup at the same cup volume, like moving from 34DD to 36D. This page converts one fixed size between countries; it does not suggest sister sizes. The bra size calculator on Calcaholic works out your size from measurements and shows your sister sizes, so start there if your current size does not fit.

Why does the same size fit differently between brands?

Conversion charts translate labels, not fit. Two 75E bras from different makers can differ by a full cup because each brand drafts its own patterns, fabrics stretch differently, and some brands run their own ladders entirely. Treat the converted size as your starting point and expect to adjust by one band or cup with an unfamiliar brand.

Bra Size Conversion: US, UK, EU, FR, AU Chart

Pick your US band and cup and get the matching UK, EU, French, Italian, and Australian sizes using the standard conversion ladders. Band numbers convert cleanly; cup letters diverge above a D cup, and this page untangles them.

Do not know your size? Measure it with our bra size calculator on Calcaholic, then come back here to convert it.

The same bra is a 34DDD in an American shop, a 34E in a British one, and a 75F in a German one. None of them is wrong. Bra sizing grew up separately in each country, and while the bands translate cleanly from one system to another, the cup letters above D went their own ways. This page takes your US size and hands you the matching UK, EU, French, Italian, and Australian labels, so you can shop any country's site without guessing.

One thing this page will not do is second-guess the size you enter. If your current bra rides up in back, digs in at the shoulders, or gapes at the top, converting the label will faithfully reproduce the problem in five more countries. The bra size calculator on Calcaholic works out your size from underbust and bust measurements and also shows your sister sizes (the neighboring band and cup combinations that hold the same volume). Get the size right there first; converting it is the easy part.

Nothing you select here is stored or transmitted. All conversions run in your browser.

How the conversion works

Band and cup convert by two different rules. The band is easy: the UK uses the same underbust-derived numbers as the US, so a US 34 band is a UK 34 band. The EU measures the band in centimeters and rounds to the nearest 5, which lines the two ladders up in fixed pairs: US 28 = EU 60, US 32 = EU 70, US 36 = EU 80, US 40 = EU 90, US 44 = EU 100. France and Spain use the EU ladder shifted up by 15 (EU 75 = FR 90). Italy compresses the whole thing into small dress-style numbers (US 34 = IT 3), and Australia uses dress sizes too (US 34 = AU 12).

Cups convert by position in the ladder, and here is where it gets messy. A, B, C, and D mean the same thing everywhere. Above D, three letters can mean three different sizes: a US DDD, a UK E, and an EU F are the exact same cup, while a UK F is a US G. The chart below is the fix. Find your US cup in the left column and read across; do not try to match letters by eye above D, because the letters lie.

The formula

UK band = US band | EU band = ladder pair (US 34 = EU 75) | FR band = EU band + 15 | cup converts by ladder position, not by letter

US band is the even number in your US size (28 to 44). EU band is the paired value on the centimeter ladder. FR band is the French and Spanish number, always the EU value plus 15. Cup position means the count of steps above A: the fifth US cup (DD) maps to the fifth UK cup (DD) and the fifth EU cup (E).

Worked example

Say you wear a US 34DD. The UK size is 34DD (same band number, and DD sits at the same ladder position in both systems). The EU band pair for US 34 is 75, and the fifth EU cup is E, so the EU size is 75E. France adds 15 to the EU band: 75 + 15 = 90, giving FR 90E. Australia pairs US 34 with dress size 12 and follows UK cup letters, so the AU size is 12DD. One bra, four labels: US 34DD = UK 34DD = EU 75E = FR 90E = AU 12DD.

The full band conversion chart

US	UK	EU	FR/ES	IT	AU
28	28	60	75	0	6
30	30	65	80	1	8
32	32	70	85	2	10
34	34	75	90	3	12
36	36	80	95	4	14
38	38	85	100	5	16
40	40	90	105	6	18
42	42	95	110	7	20
44	44	100	115	8	22

Italian and Australian ladders are most commonly published for US bands 32 to 42. The 28, 30, and 44 rows extend the same pattern, but expect thinner brand coverage at those ends.

The cup conversion chart

US	UK	EU
A	A	A
B	B	B
C	C	C
D	D	D
DD	DD	E
DDD (F)	E	F
G	F	G
H	FF	H

French and Spanish brands use EU cup letters, Italy uses EU cup letters on its numeric bands, and Australia uses UK cup letters. Note the trap in the middle of the chart: US DDD, UK E, and EU F are the same cup, and a US G is a UK F. Matching letters by appearance above D will put you one or two cups off.

Why brands still will not agree with the chart

These ladders are the standard conventions, and any decent international brand's own chart will match them. But a conversion chart translates labels, not garments. Each brand drafts its own patterns, chooses its own fabrics, and decides how much stretch to build into a band, so two 75E bras from different makers can genuinely fit a cup apart. A few brands (notably some French and Italian houses) run proprietary ladders that ignore the conventions entirely. Treat the converted size as the size to try first, check the brand's own chart when one exists, and do not take it personally when you end up a band or cup away from the chart. That is the industry being inconsistent, not your body being difficult.

Converting other things too? Try the shoe size converter or the ring size calculator. And if you are not sure the size you just converted is really your size, measure it properly with the bra size calculator on Calcaholic.

Bra Size Conversion