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Bra Size Conversion: International Bra Size Charts & Converter

Q: What is a 75B bra size in US?

A 75B in EU or Japanese sizing is a US 34B. The 75 is a 75 centimetre band, which converts to a US 34, and B is the same letter in every system. 70B is a 32B, 80B is a 36B and 85B is a 38B.

Q: How does Italian bra sizing work?

Italy numbers the band 1 through 6. Italian 1 is EU 70 and US 32, 2 is EU 75 and US 34, 3 is EU 80 and US 36, 4 is EU 85 and US 38, 5 is EU 90 and US 40, 6 is EU 95 and US 42. Cups follow the European alphabet, so an Italian 3C is a US 36C.

Q: Are Japanese and Chinese bra sizes the same as European?

On paper yes: a Japanese or Chinese 75 is an EU 75 and cups run the plain alphabet. In practice Japanese and many Asian brands grade cups smaller and pad more, so the same label runs about a cup small. A US 34C should try a Japanese 75D.

The size you wear now, translated into US, UK, EU, French, Italian, Australian and Japanese sizing, with sister sizes and every bra we stock in it. A UK 34E, an EU 75F and a US 34DDD are the same body. This page proves it.

Live converter

The size on your label Pick the system above, then the band number and cup letter printed on a bra that fits you well.

Band

Cup

Never been measured? Start with the bra size calculator, then convert the result here.

The working, shown

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Your size in US sizing

34C

From US 34C

Sister sizes · same cup volume

Shop 34C bras

Seven sizing systems Bands 28 to 48, cups A to K Live stock counts per size Nothing stored, no signup

Most searched conversions Tap one to load it into the converter

Popular sizes Jump straight to what we carry

32B 34B 34C 34D 34DD 34E 36C 36D 36DD 36E 38C 38D 40D 42D

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The problem

Why a bra size does not travel

There is no international standard. Every manufacturing region wrote its own label decades ago, and the labels stuck even though the body underneath is measured the same way everywhere. The differences fall into three buckets, and once you can see them, every chart on this page becomes obvious.

The band unit

The US, UK and Australia print the band in inches, or in Australia's case a dress-size run derived from inches. Continental Europe, Japan, China and Korea print the underbust in centimetres, rounded to the nearest five. France and Spain take the European centimetre number and add fifteen. Italy throws the circumference away and counts 1 to 6.

US 34 = UK 34 = EU 75 = FR 90 = IT 2 = AU 12 = JP 75

The cup ladder

Three ladders, one volume. The US doubles up past D: DD, DDD, then jumps to G. The UK and Australia keep the alphabet going with doubled letters in between: DD, E, F, FF, G, GG. Europe, France, Italy and Japan use a plain alphabet with no DD at all: D, E, F, G, H. All three agree through D. Almost every cross-border sizing mistake happens above it.

6″ of difference = US DDD = UK E = EU F

The brand's own cut

Even inside one country two brands can grade the same label half a cup apart. Across borders the gap widens: Japanese and many Asian brands run a cup small and pad heavily, UK full-bust specialists cut deeper and narrower than US t-shirt bras. The arithmetic on this page is exact. How a labelled size fits is not, which is why we show sister sizes with every result.

US 34C on paper = JP 75C · in practice, try JP 75D

Bra size calculator Bra size guide Every cup size AA to K explained Shop every bra

Interactive

International bra size chart, band by band

Choose a band and read every cup across all seven systems in one row, with the number of bras we currently carry in it. The row that matches the converter above is marked. Cups the brands do not cut in that band are greyed.

US and UK band numbers. The other five appear in the table.

Every cup in the selected band converted across US, UK, EU, French, Italian, Australian and Japanese sizing
Difference	US	UK	EU / DE / NL / PL	FR / ES	IT	AU / NZ	JP / CN / KR	In stock

The stock column links straight to the collection for that size, labelled the way the bras in it are labelled. All 126 sizes

Bra size calculator Bra size chart & sister sizes Bra size guide Printable size chart Shop bras by size

Converted it? Shop it.The converter above sets this button to your size, labelled the way the bras are.

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Where it goes wrong

Cup letters: US versus UK versus EU

A cup letter is shorthand for the difference between your bust and your band, one letter per inch. Every system counts the inches the same way. They only disagree about what to call them once the count passes four.

Cup letter for each inch of bust-to-band difference in US, UK, EU and Australian sizing
Difference	US	UK	EU / FR / IT / JP	AU / NZ

The row for your cup is marked. Read across it and you have your letter in every system on the page; the band is the only other thing that changes.

The DD rule

Through D, every system uses the same letter. At five inches the US and UK both say DD while Europe says E. At six inches the three split completely: US DDD, UK E, EU F. From there the US and EU ladders run in step one letter apart in name only, while the UK ladder falls further behind with every doubled letter. A US 34G is a UK 34F and an EU 75G. Same bra, three labels.

Why the UK falls behind

Each UK doubled letter — DD, FF, GG, HH, JJ — is a whole cup step that the other systems spend a fresh letter on. By the time the UK reaches H it has used eleven steps and the US and EU have reached K. This is why a UK 30H converts to a US 30K and not to a US 30H, and why a shopper who assumes letters match will order three cups too small from a British brand.

DD cup size explained C cup size explained DDD / E cup bras F & FF cup bras G & GG cup bras H cup & up

The logic of each system

Bra size conversion, country by country

The chart gives you the answer. This is the reasoning behind it, so you can convert in your head at a checkout in another country and spot a bad chart when you see one.

Lace bras with a soft tape measure on linen, HauteFlair bra size conversion guide

UK to US (American), and US to UK

The easy half: bands are identical, so a UK 34 is a US 34. Cups match exactly through DD. Above that the UK continues the alphabet with doubled letters — E, F, FF, G, GG, H, HH, J, JJ, K — while the US stacks Ds and then jumps to G. So a UK 34E is a US 34DDD, a UK 34F is a US 34G, a UK 28FF is a US 28H and a UK 30H is a US 30K. Ireland, India and most Commonwealth markets use the UK ladder, and so does Australia.

Brands that print UK sizing include Panache, Freya, Elomi, Fantasie, Cleo, Curvy Kate and Pour Moi. US labels include Wacoal, Le Mystère, Natori, b.tempt'd, Bali, Playtex and Maidenform.

European (EU) bra sizes: Germany, the Netherlands, Poland, Scandinavia

European bands are the underbust in centimetres, rounded to the nearest five. The mapping to inches is fixed: US 28 is EU 60, US 30 is 65, 32 is 70, 34 is 75, 36 is 80, 38 is 85, 40 is 90, 42 is 95, 44 is 100, 46 is 105 and 48 is 110. Cups run a plain alphabet with no DD, so EU E is a US and UK DD, EU F is a US DDD and UK E, EU G is a US G and UK F. An EU 75D is a US 34D; an EU 75E is a US 34DD.

Polish full-bust brands such as Ewa Michalak and Comexim are graded on this system, as are Belgian houses like PrimaDonna and Marie Jo, German labels like Anita and Triumph, and Dutch brand Marlies Dekkers. Polish brands in particular cut deep, projected cups; take the converted size as a floor and check the brand's own chart before ordering.

France and Spain

French and Spanish sizing uses the European cup alphabet but adds fifteen to the band number. French 90 is EU 75 is US 34; French 95 is EU 80 is US 36. The large numbers are the trap. A French 95C is not a 95 centimetre band; it is an 80 centimetre band with fifteen added by convention. A French 90C is a US 34C, a French 95E is a US 36DD, a French 100F is a US 38DDD.

Chantelle, Simone Pérèle, Empreinte, Aubade, Lise Charmel and Maison Lejaby all originate on this system. Many print the US or UK equivalent on the same label when sold abroad; if a Chantelle tag reads 90C and 34C together, that is the same size, not two options.

Italy

Italy drops the circumference and numbers the band 1 through 6, sometimes with a 0 below. Italian 1 is EU 70 and US 32; 2 is EU 75 and US 34; 3 is EU 80 and US 36; 4 is EU 85 and US 38; 5 is EU 90 and US 40; 6 is EU 95 and US 42. Cups follow the European alphabet. An Italian 3C is a US 36C; an Italian 2E is a US 34DD. Outside 32 to 42 there is no Italian equivalent, and the converter says so rather than inventing one. Intimissimi, La Perla and Calzedonia are the labels you will meet most.

Japanese, Chinese and Korean bra sizes

On paper East Asia uses the European system: a Japanese 75 band is an EU 75 band, cups run the plain alphabet. Chinese labels often print both numbers together, 34/75B, and some print the cup as a centimetre difference: in the Chinese and Japanese system each cup is a 2.5 cm step between bust and underbust, so A is 10 cm, B is 12.5, C is 15, D is 17.5, E is 20 and F is 22.5. Japanese charts usually list the bust and underbust in centimetres next to the size, which is a useful cross-check. The catch is fit, not arithmetic. Japanese and many Chinese and Korean brands grade cups smaller and pad more heavily, so the same label runs roughly a cup small against Western brands. The maths says US 34C is JP 75C; the changing room usually says JP 75D. Treat the direct conversion as your floor and go up one cup on a first order from Wacoal Japan, Triumph Japan, Uniqlo or any Chinese marketplace brand.

Australia and New Zealand

Australia and New Zealand number the band on a dress-size run: AU 8 is US 30, 10 is 32, 12 is 34, 14 is 36, 16 is 38, 18 is 40, 20 is 42. Add 22 to the Australian number to get the US band. Cups follow the UK ladder — DD, E, F, FF, G — not the US double-D system. An AU 12D is a US 34D, an AU 12DD is a US 34DD and an AU 12E is a US 34DDD. Berlei, Triumph Australia, Bonds and Bras N Things all print this way. Australian charts sometimes print the band in centimetres as well; when they do, read it as the EU number.

India

India generally follows the UK convention: an inch band and UK cup letters, so an Indian 34D is a US 34D and an Indian 34E is a US 34DDD. Many Indian retailers print the European centimetre band alongside — 75, 80, 85 next to 34, 36, 38 — and some now stock Chinese-made lines graded on the Asian pattern. When a chart mixes both, trust the cup letter, use the UK rule above D, and treat anything sold as "free size" as a guess.

Panache Le Mystère All brands A–Z Full-figure bras Plus-size bras Every cup size AA to K explained

Metric

Bra band sizes in centimetres

The number on a European, Japanese or Chinese label is the underbust in centimetres, never the bust. Multiply an inch band by 2.54 and round to the nearest five and you have it; the table does the rounding for you, and shows why 34 inches becomes 75 rather than 85.

Band size conversion across US, UK, EU, French, Italian, Australian and Japanese systems with exact centimetre values
US / UK	Exact cm	Fits underbust	EU / JP / CN	FR / ES	IT	AU / NZ

The "exact" column is the tape measurement. A 34 inch underbust is 86.4 cm, which is why the European band is a label rather than a literal measurement: bands are cut in five centimetre steps, and 75 is the step the industry assigned to a 34. If you measure in centimetres, take your underbust reading and find the nearest row rather than rounding to five yourself; the calculator does the same thing when you switch it to centimetres.

Centimetres to bra size

If you measured in centimetres, you do not need to convert to inches first. Find your underbust reading in the "fits underbust" column and take that row's band. For the cup, subtract underbust from bust in centimetres: each 2.5 cm of difference is one letter, so 2.5 cm is A, 5 cm is B, 7.5 cm is C, 10 cm is D, 12.5 cm is DD (EU E) and 15 cm is DDD (UK E, EU F). An 84 cm underbust with a 94 cm bust is a 34D, an EU 75D. The calculator does this when switched to centimetres.

What does an 80 cm bra size mean?

An 80 on an EU, Japanese or Chinese label is an 80 centimetre underbust band, the same body as a US or UK 36. So an 80C is a 36C and an 80B is a 36B. It never refers to the bust measurement, which is why the continental number tracks the inch band so neatly.

What is a 75B in US sizing?

A 34B. The 75 is a 75 centimetre band, which is a US 34, and B is identical in every system. By the same logic 70B is a 32B, 80B is a 36B and 85B is a 38B. Only from E upward does the letter need translating.

Calculator in centimetres How to measure bra size Printable size chart Bra size chart & sister sizes

Read the label

Which system is on the tag, brand by brand

The single most useful thing to know before converting is which ladder a brand prints. A letter is meaningless until you know whose alphabet it belongs to. This is where the brands you are most likely to meet were cut.

Brand	Prints	Home market	What to know
Panache, Cleo, Sculptresse	UK	United Kingdom	Deep, projected cups built for D to K. A Panache 34E is a US 34DDD.
Freya, Elomi, Fantasie	UK	United Kingdom	Elomi runs true and slightly generous in the band. Fantasie cups are shallower than Panache at the same letter.
Curvy Kate, Pour Moi	UK	United Kingdom	UK ladder throughout. Bands run comfortable; some wearers size down one band.
Wacoal, b.tempt'd	US	United States	US double-D ladder. Wacoal Japan is a separate line on JP sizing and runs a cup small.
Le Mystère, Natori	US	United States	US ladder, generous cups above DD. Natori bands run slightly loose.
Chantelle, Simone Pérèle	FR, often with US alongside	France	A tag reading 90C / 34C is one size printed twice. Cups follow the European alphabet.
Empreinte, Aubade, Lise Charmel	FR / EU	France	Empreinte grades true to measurement with firm bands; many wearers go up one band from their UK size.
PrimaDonna, Marie Jo	EU, with US and UK on the tag	Belgium	European ladder. PrimaDonna cups are deep and the wires wide; check root width, not just the letter.
Ewa Michalak, Comexim	EU (Polish)	Poland	Centimetre band, plain-alphabet cup. Both cut for projected shapes and run smaller in the band than the number suggests.
Anita, Triumph, Marlies Dekkers	EU	Germany, Switzerland, Netherlands	European ladder. Triumph sells regional lines on UK, EU and JP sizing depending on the market.
Intimissimi, La Perla	IT, often with EU	Italy	Bands 1 to 6. Convert to EU first, then to inches.
Berlei, Bonds, Bras N Things	AU	Australia	Dress-size band, UK cup ladder. Add 22 to the band number.
Wacoal Japan, Uniqlo, Peach John	JP	Japan	Centimetre band, plain alphabet, graded small. Go up one cup from the direct conversion.

Fit notes are general tendencies, not guarantees. Every product page on HauteFlair shows the brand's native size and the US equivalent side by side, so you never have to convert at checkout.

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Every brand above, in your sizeFree US shipping over $50, and the native size printed beside the US one on every product page.

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Worked out

Bra size equivalents: the conversions people search for most

Each one follows the same two moves: match the band to its inch or centimetre equivalent, then translate the cup letter along the ladder. The last column links to that size in stock.

You wear	In US	In UK	The logic	Shop
70B (EU / JP)	32B	32B	70 cm band is a US 32. B is B everywhere.	32B
75B (EU / JP)	34B	34B	75 cm band is a US 34. B matches.	34B
80B (EU / JP)	36B	36B	80 cm band is a US 36. B matches.	36B
85C (EU / JP)	38C	38C	85 cm band is a US 38. C matches.	38C
75D (EU)	34D	34D	75 cm is a 34. D is the last letter that matches everywhere.	34D
75E (EU)	34DD	34DD	EU E is the first divergence: five inches, DD in US and UK.	34DD
80F (EU)	36DDD	36E	Six inches. EU F, US DDD, UK E: three names, one cup.	36E
34E (UK)	34DDD	34E	UK E sits one step above DD, which the US calls DDD.	34E
34F (UK)	34G	34F	Seven inches. The US skips from DDD straight to G.	34F
32FF (UK)	32H	32FF	UK FF is the eighth step, which lands on US H.	32FF
30H (UK)	30K	30H	Eleven steps. UK H is three doubled letters behind US H.	30H
French 90C	34C	34C	French 90 is EU 75, which is a US 34. C matches.	34C
French 95E	36DD	36DD	French 95 is EU 80, a US 36. EU E is DD.	36DD
Italian 3C	36C	36C	Italian 3 is EU 80, a US 36. C matches.	36C
Italian 2E	34DD	34DD	Italian 2 is EU 75, a US 34. E is DD.	34DD
AU 12DD	34DD	34DD	AU 12 plus 22 is a 34. Australian cups follow the UK ladder.	34DD
AU 14E	36DDD	36E	AU 14 is a 36. AU E is UK E, which is US DDD.	36E
JP 75D	34D	34D	Japanese 75 is a 34. On paper D is D; in a Japanese brand it often fits like a Western C.	34D
32D (US)	32D	32D	Four inches. D is D in every system; EU 70D, FR 85D, AU 10D.	32D
US 32DDD (Victoria's Secret and most US labels)	32DDD	32E	Six inches. UK 32E, EU 70F, FR 85F, AU 10E. On some US tags the same cup is printed F.	32E
US 34DDD	34DDD	34E	The reverse of the most common question. DDD and F are the same US cup on most labels; in the UK both are an E.	34DDD
US 36G	36G	36F	Seven inches. US G is UK F and EU G.	36F

Collections are labelled the way the bras inside them are labelled, which for our fuller-bust brands is UK lettering. That is why "34G US" sends you to the 34F collection: same size, the label the brand printed.

Plus-size letters, 1X to 4X, in band and cup

Some plus-size bras and most sleep and sports bras are sold as 1X to 4X rather than by band and cup. There is no standard and the brand's own chart wins, but this is the usual mapping. If your cup is a DD or above, go up one letter or choose a style cut by band and cup instead.

Letter size	Usually covers	Underbust	Shop
XL	38C, 38D, 40C	37–40″	38D
1X	40D, 40DD, 42C	39–42″	40D
2X	42D, 42DD, 44C	41–44″	42D
3X	44D, 44DD, 46C	43–46″	44D
4X	46D, 48C, 48D	45–49″	48D

S to L in bra sizes is on the bra size chart. For sized plus bras, 40 to 48 bands, see plus-size bras.

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Found your row? Shop it.Every conversion in the table links to its collection. Your own size is on the button.

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Avoid these

Six conversion mistakes, and the fix for each

Most cross-border returns come from the same handful of errors. The converter prevents all of them, but if you are working from memory or from a brand's own chart, this is what to watch for.

Assuming cup letters match across systems

A US DD is a UK DD, so it feels safe to assume the rest line up. They do not. A US DDD is a UK E, a US G is a UK F, a US H is a UK FF.

FixAbove D, always convert through the inch difference. Count the steps, never the letters.

Reading a French band as a measurement

French 95 and EU 80 are the same band; France adds fifteen by convention. There is no 95 centimetre body behind a French 95.

FixSubtract fifteen to get the EU number, then read the EU column.

Buying Japanese or Asian brands at the direct conversion

The arithmetic says US 34C is JP 75C. The cup is graded smaller and padded, so it usually fits like a Western B.

FixOrder one cup up on a first purchase and keep the band. A US 34C tries a JP 75D.

Skipping the sister-size check

Brand grading varies enough across borders that the converted size can sit a band loose or tight.

FixWhen entering a new brand, try the converted size and its two nearest sisters. One of the three almost always fits cleanly.

Trusting a brand's "approximate" US equivalent

Some retailers list conversions that quietly drift from the standard ladder to flatter their own grading.

FixIf a brand's US equivalent is two letters off the chart above, treat it as a fit note about that brand, not a conversion.

Ignoring the returns policy

International orders often exclude free returns, and a single wrong cup can cost more in postage than the bra.

FixCheck the return window before ordering across borders, or buy the same brand from a retailer that carries it locally with its size printed both ways.

Shipping & returns Re-measure with the calculator Full measuring guide All 40+ bra types explained

The rescue move

Sister sizes work in every system

Sister sizes are different labels holding the same cup volume: down one band and up one cup, or up one band and down one cup. Because volume is universal, the relationship survives conversion. When a country's brands run tight, sister up. When they run loose, sister down.

Your sister size family · shown in US and in the system you chose

Volume is constant across the row. What changes is how firmly the band holds your ribcage, and therefore how much of the support comes from the band rather than the straps.

Japanese or Polish brand feels tight

Both tend to cut the band small. Go up one band and down one cup. A converted 34D becomes a 36C, the cup stays the same, and the band stops digging.

US or French brand rides up at the back

Softer bands are common in both. Go down one band and up one cup. A converted 36C becomes a 34D and the band finally does its share of the work. The full logic, with examples for every band, is in the sister sizes guide.

Bra size chart & sister sizes Sister sizes explained Shop bras by size Strapless Sports Bra-sized swimwear

Your size sold out? Try a sister.The sister-size family above links to stock in each. Same cup volume, different band tension.

Shop my size Back in stock

Questions

Bra size conversion, answered

What is the difference between US and UK bra sizes?

Bands are identical: a US 34 is a UK 34. Cup letters match through DD, then split. The US doubles up (DD, DDD) and jumps to G, while the UK keeps the alphabet going (DD, E, F, FF, G, GG). A US 34DD is a UK 34DD, a US 34DDD is a UK 34E, and a US 34G is a UK 34F. Above the D cup, always check which ladder the brand prints.

How do EU bra sizes compare to US?

European bands are the underbust in centimetres in five centimetre steps: US 32 is EU 70, 34 is 75, 36 is 80, 38 is 85, 40 is 90. Cups use a plain alphabet with no DD, so EU E is a US DD, EU F is a US DDD and EU G is a US G. An EU 75E is a US 34DD.

What is a 75B bra size in US?

A 34B. The 75 is a 75 centimetre band, which converts to a US 34, and B is the same letter in every system. By the same logic 70B is a 32B, 80B is a 36B and 85B is a 38B.

Why do French bra sizes have large numbers like 95C?

French and Spanish sizing adds fifteen to the European band number. An EU 80 band is a French 95 band; they describe the same body. Cups follow the European alphabet. A French 95C is an EU 80C, a US 36C and a UK 36C.

How does Italian bra sizing work?

Italy numbers the band 1 through 6 instead of printing a circumference. Italian 1 is EU 70 and US 32, 2 is EU 75 and US 34, 3 is EU 80 and US 36, 4 is EU 85 and US 38, 5 is EU 90 and US 40, 6 is EU 95 and US 42. Cups follow the European alphabet, so an Italian 3C is a US 36C and an Italian 2E is a US 34DD.

Are Japanese and Chinese bra sizes the same as European?

On paper, yes: a Japanese or Chinese 75 is an EU 75, and cups run the plain alphabet. In practice Japanese and many Asian brands grade cups smaller and use more padding, so the same label runs about a cup small against Western brands. If you are a US 34C, try a Japanese 75D rather than a 75C.

What does an 80 cm bra size mean?

An 80 on an EU, Japanese or Chinese label is an 80 centimetre underbust band, which is a US and UK 36. The number on a continental label is always the band, never the bust. An 80C is a US 36C.

How do I convert my band size to centimetres?

Multiply the inch band by 2.54 and round to the nearest five. Bras step in five centimetre increments, so the standard mapping is US 28 to EU 60, 30 to 65, 32 to 70, 34 to 75, 36 to 80, 38 to 85, 40 to 90, 42 to 95, 44 to 100, 46 to 105 and 48 to 110. The centimetre table shows the exact values beside the rounded labels.

Is a US DDD the same as a UK E?

Yes. Both sit at a six inch difference between bust and band. The same cup is an F in European, French, Italian and Japanese sizing. Some US brands print F instead of DDD; on those labels F and DDD are interchangeable.

Which is bigger, a UK F or a US F?

A UK F. It sits at a seven inch difference, one step above UK E. A US F, where a brand uses it, is the same as a US DDD at six inches. So a UK 34F is a US 34G, while a US 34F is a UK 34E. This single letter causes more wrong orders than any other.

How do Australian bra sizes convert to US?

Add 22 to the Australian band number: AU 10 is a US 32, AU 12 is a 34, AU 14 is a 36, AU 16 is a 38. Cups follow the UK ladder, so AU DD is a US DD, AU E is a US DDD and AU F is a US G. An AU 12DD is a US 34DD.

What size am I if the conversion falls between two sizes?

Use a sister size. Sister down (smaller band, larger cup) for a firmer fit, or sister up (larger band, smaller cup) for comfort; the cup volume is the same either way. The converter lists your sisters with every result.

Do all brands in one country use the same conversion?

No. The ladder is standard within a country, but grading is not: two brands can differ by half a cup or more at the same label. Conversion charts give you the right size to try first. The brand's own chart and reviews from wearers with similar measurements tell you whether to adjust from there.

How do I convert centimetres to a bra size?

Take your underbust in centimetres and find the row it falls in on the centimetre table; that is your band in every system. Then subtract underbust from bust: every 2.5 cm of difference is one cup letter, so 7.5 cm is a C and 12.5 cm is a DD. An 84 cm underbust and 94 cm bust is a 34D, which Europe labels 75D.

What is a Victoria's Secret 32DDD in UK or European sizing?

A UK 32E and an EU 70F. Victoria's Secret and most American labels use US sizing, so the band is the same as UK and the cup follows the US ladder: DD, DDD, then G. The same applies to any US size: 34DDD is UK 34E and EU 75F; 36G is UK 36F and EU 80G.

What is 4X in bra sizes?

Usually a 46 to 48 band with a C or D cup, though letter sizing has no standard and each brand's chart wins. The 1X to 4X table gives the usual mapping. For a DD cup or above on those bands, a bra cut by band and cup will fit better than a letter size.

Can I convert a sports bra or swimwear size the same way?

Bra-sized swimwear and underwired sports bras convert exactly like everyday bras. Compression sports bras and small-medium-large swim tops do not; those are graded on the brand's own scale and you will need its chart. Our bra-sized swimwear is labelled in bra sizes for exactly this reason.

Complete bra size guide Panty size chart Bra fit & style guide More FAQs Talk to a fitter

Under the hood

How this converter works

No proprietary table and nothing hidden. Every size on this page is derived from two numbers, the band in inches and the bust-to-band difference in inches, and published here so you can check it against a bra you already own.

Band, then cup, then every label

The band you enter is turned back into inches: European and Japanese bands come down from centimetres, French bands lose fifteen first, Italian bands are counted out, Australian bands gain twenty-two. The cup letter is turned into a count of inches by finding its position on that system's ladder. Those two numbers are then read out on all seven ladders.

Every band becomes an inch band US and UK stay as they are. EU and JP: (cm − 60) ÷ 5 × 2 + 28. FR: subtract 15, then the EU rule. IT: number × 2 + 30. AU: add 22.

Every cup becomes a count of inches A is one inch, B is two, and so on up each system's own ladder. The ladders differ only in what they call the fifth step and beyond.

The two numbers are read out in all seven systems Same band rule in reverse, same inch count looked up on each ladder. Sister sizes move the band two inches one way and the count one step the other.

Worked example A UK 34E: the band is 34 inches, and E is the sixth step on the UK ladder, so 6″ of difference. Six steps on the US ladder is DDD, on the EU ladder F. A 34 inch band is EU 75, FR 90, IT 2, AU 12. So: US 34DDD, EU 75F, FR 90F, IT 2F, AU 12E, JP 75F.

What we deliberately do not do

No brand fudge. Where a brand runs small or large we say so in words, on this page and on the product page. We never quietly shift the conversion to match a brand's grading.

No invented Italian sizes. The Italian scale runs 1 to 6, US 32 to 42. Outside that range the converter shows a dash rather than a number no Italian brand prints.

No plus-four, anywhere. All seven ladders start from the modern method. If a chart you find elsewhere puts a 34 inch underbust in a 38 band, it is using a 1950s rule, and its conversions will be four inches out in every system.

No stored sizes. Your last conversion is remembered in your own browser so the page opens where you left it. Nothing is sent to us or attached to an account.

Ranges we cover

Bands 28 to 48 in US and UK, 60 to 110 in EU and JP, 75 to 125 in FR, 1 to 6 in IT, 6 to 26 in AU. Cups from a one inch difference to fifteen: A to O in US and EU, A to K in UK and AU. Not every combination is cut in every band; the size directory shows what actually exists.

Seven labels, one body