Ireland Bra Size Calculator & Converter
Calculate your Irish bra size using UK-standard inch-based bands (28–46) and UK cup letters — identical to the UK system. Convert instantly to EU, US, AU & FR, with fit notes for M&S Ireland, Dunnes Stores, Penneys, Next, Bravissimo & ASOS IE.
How to measure correctly
- Wear a non-padded bra or no bra for accurate readings.
- Underbust: wrap tape snugly around your ribcage directly under the bust. Keep tape parallel to floor. Exhale and record.
- Overbust: measure around the fullest part of your bust. Tape loose enough to slide a finger underneath.
- Stand naturally — don’t lift arms or lean forward.
- Round to the nearest ½ inch (or 0.5 cm) for best accuracy.
International Size Conversions
Your Sister Sizes (Same Cup Volume)
Recommended Bras in Your Irish/UK Size
Top-rated brands available in Ireland and from UK retailers shipping to IE.
- IE/UK bands 30–46, cups A–H
- Three-section cup, wire support
- Body by M&S, Total Support styles
- IE/UK bands 28–42, cups D–L
- Underwire, full coverage
- Panache, Freya, Fantasie styles
Measure in inches or centimetres — Irish bra sizing uses the UK system throughout
What Is the Irish Bra Sizing System?
Irish bra sizing is identical to the UK system: inch-based band numbers (28, 30, 32, 34, 36, 38, 40, 42, 44, 46) paired with UK cup letters (A, B, C, D, DD, E, F, FF, G, GG, H). The band is your underbust in inches, rounded to the nearest even number. Cup is the difference between overbust and underbust in inches, approximately one inch per step. IE 34DD = UK 34DD exactly. All major Irish retailers — M&S Ireland, Dunnes Stores, Penneys, Next Ireland, Bravissimo, and ASOS IE — use UK sizing. There is no separate Irish sizing convention.
Ireland uses the same bra sizing system as the United Kingdom in every respect. This is a natural consequence of geography, retail history, and trade relationships — the vast majority of lingerie sold in Ireland is sourced from the same supply chains as UK retail, and all major Irish retailers operate using UK sizing standards without any modification.
M&S (Marks & Spencer) Ireland is the dominant lingerie retailer in the Irish market and is widely considered the reference brand for Irish bra fitting, as it is in the UK. Their sizing data, fitting services, and cup-range coverage set the standard that other Irish retailers are judged against. Dunnes Stores — Ireland’s largest domestically-owned retailer — stocks lingerie using the same UK sizing. Penneys (known as Primark outside Ireland) similarly uses UK sizing throughout their large Republic of Ireland store network.
The key practical implication for Irish shoppers is that shopping from UK retailers online — ASOS UK, Marks and Spencer UK, Bravissimo, John Lewis, Next UK — requires no size conversion at all. Your Irish 34DD is a UK 34DD. The only conversions needed are when shopping from EU, US, AU, or FR brands.
IE 32 and IE 34 are the most common Irish bra bands — identical to UK 32 and UK 34.
IE/UK cup letters — A, B, C, D, DD, E, F, FF, G, GG, H, HH, J. DD is not doubled EU E — it is a separate size step.
- Irish sizing = UK sizing exactly. IE 34DD = UK 34DD. No conversion needed when buying from UK retailers
- IE 34 = EU 75 = US 34 = AU 12 = FR 90 — all the same underbust (33–34 in / 68–72 cm)
- IE/UK cup letters include doubled letters: DD, FF, GG — unlike EU cups which use single letters only
- IE DD = US DD = EU E. IE E = US DDD = EU F. The doubled cup letters shift one step vs EU above D
- M&S Ireland, Dunnes Stores, Penneys, Next IE, Bravissimo and ASOS IE all use UK sizing
How to Measure Your Irish Bra Size
You need your underbust and overbust in inches or centimetres. The band is the underbust rounded to the nearest even inch; the cup is the difference in inches.
Prepare correctly
Wear a non-padded bra or no bra. Stand naturally with arms relaxed. M&S Ireland’s fitting guides recommend measuring without padding for maximum accuracy — the same guidance used by Bravissimo and all major Irish retailers.
Measure your underbust in inches
Wrap tape snugly around your ribcage directly beneath your bust, parallel to the floor. Exhale fully and record. Round to the nearest even inch for your band: 29–30 in = 30, 31–32 in = 32, 33–34 in = 34, 35–36 in = 36, 37–38 in = 38, 39–40 in = 40. If your underbust is an odd number (e.g., 31 in), try both the smaller band (30) and larger band (32) to find your best fit.
Measure your overbust in inches
Measure around the fullest point of your bust. Keep tape horizontal and loose enough to slide one finger underneath. Record to the nearest ½ inch.
Calculate your cup letter
Subtract underbust from overbust in inches: 1 in = A, 2 in = B, 3 in = C, 4 in = D, 5 in = DD, 6 in = E, 7 in = F, 8 in = FF, 9 in = G, 10 in = GG, 11 in = H. Each step is approximately one inch. DD is a genuine double-D cup — not European E.
Combine band and cup
Your Irish bra size is the even-number band plus the cup letter: 34DD, 36C, 32E. This is identical to a UK size — no prefix or country code needed when shopping Irish or UK retailers.
M&S Ireland offers free in-store bra fittings at all their Republic of Ireland stores. Their fitting specialists are trained to the UK standard and can measure you for the full M&S range including the dedicated DD+ lingerie section. Bravissimo also ships to Ireland with free returns on orders over a certain threshold — their D+ cup specialist range starts where M&S and Dunnes typically stop. For extended cup sizes (FF and above), Bravissimo is the most comprehensive option available to Irish shoppers.
Skip the calculation — use the calculator
Enter your measurements once and get your exact Irish/UK size plus conversions to UK, EU, US, AU and FR instantly.
Open the Ireland Bra Size Calculator →Irish Bra Size Chart (UK/IE Band Reference)
This chart is the standard Irish sizing reference used by M&S Ireland, Dunnes Stores, Penneys, Next IE, Bravissimo, and ASOS IE. Irish band numbers are identical to UK band numbers in every respect.
Irish/UK bra sizes compared with EU, US, AU and FR systems
| IE / UK Band | US Band | EU Band | FR Band | AU Band | Underbust (in) | Underbust (cm) |
|---|---|---|---|---|---|---|
| IE / UK 28 | 28 | EU 60 | FR 75 | AU 6 | 27–28 in | 53–57 cm |
| IE / UK 30 | 30 | EU 65 | FR 80 | AU 8 | 29–30 in | 58–62 cm |
| IE / UK 32 | 32 | EU 70 | FR 85 | AU 10 | 31–32 in | 63–67 cm |
| IE / UK 34 | 34 | EU 75 | FR 90 | AU 12 | 33–34 in | 68–72 cm |
| IE / UK 36 | 36 | EU 80 | FR 95 | AU 14 | 35–36 in | 73–77 cm |
| IE / UK 38 | 38 | EU 85 | FR 100 | AU 16 | 37–38 in | 78–82 cm |
| IE / UK 40 | 40 | EU 90 | FR 105 | AU 18 | 39–40 in | 83–87 cm |
| IE / UK 42 | 42 | EU 95 | FR 110 | AU 20 | 41–42 in | 88–92 cm |
| IE / UK 44 | 44 | EU 100 | FR 115 | AU 22 | 43–44 in | 93–97 cm |
| IE / UK 46 | 46 | EU 105 | FR 120 | AU 24 | 45–46 in | 98–102 cm |
IE/UK Cup to EU, US, AU Conversion
UK/IE cups use doubled letters (DD, FF, GG) unlike EU cups which use single letters. Above D cup, UK/IE cups run one step behind EU cups — UK DD = EU E, UK E = EU F.
| IE / UK / IN Cup | US Cup | EU / IT / DE / ES Cup | AU / NZ Cup | Difference (in) |
|---|---|---|---|---|
| AA | AA | AA | AA | ~0.5 in |
| A | A | A | A | 1 in |
| B | B | B | B | 2 in |
| C | C | C | C | 3 in |
| D | D | D | D | 4 in |
| DD | DD | E | DD | 5 in |
| E | DDD | F | E | 6 in |
| F | DDDD/G | G | F | 7 in |
| FF | G/H | H | FF | 8 in |
| G | H/I | I | G | 9 in |
| GG | I/J | J | GG | 10 in |
| H | J/K | K | H | 11 in |
| HH | K/L | L | HH | 12 in |
| J | L/M | M | J | 13 in |
Many Irish shoppers believe DD cup is unusually large. It is not. DD is one step above D — the fifth cup size — and is one of the most commonly worn sizes in Ireland and the UK. The misconception arises from unfamiliarity with the UK/IE cup alphabet, where letters jump from D directly to DD rather than continuing to E as in EU sizing. An Irish 34DD, a European 75E, and a US 34DD are the same cup volume — three different letters, same size. M&S Ireland’s fitting data shows DD is among their top five best-selling cup sizes nationally.
Sister Sizes in Irish Bra Sizing
Sister sizes step in 2-inch band increments and one cup letter — identical to the UK system.
| IE/UK Size | EU Equiv. | Band Feel | Cup Volume |
|---|---|---|---|
| 32E | EU 70F | Tighter | Same as 34DD |
| 34DD | EU 75E | Standard | Your primary size |
| 36D | EU 80D | Looser | Same as 34DD |
From M&S Ireland precision fit to Penneys everyday basics — all using UK inch-based sizing
Irish Bra Brand Sizing Guide
Every major Irish lingerie retailer uses UK sizing. Construction, range, and fit philosophy vary significantly across price points.
M&S Ireland
The dominant Irish lingerie retailer and the national reference for UK/IE sizing. M&S Ireland’s sizing follows UK standards precisely — their fitting data is the most comprehensive of any retailer in the Irish market. Stocks IE 28–46 and cups A–J in the full range including specialist DD+ sections. Free in-store fitting at all Republic of Ireland stores.
Fit: True to IE/UK size. M&S is the Berlei of the Irish market — calibrate against M&S before testing other brands. Cups grade accurately through the extended range. Bands run true — firm when new, relaxing with wear.
Dunnes Stores IE
Ireland’s largest domestically-owned retailer. Dunnes stocks lingerie in their own-label St. Bernard and Savida ranges using UK sizing. Stocks IE 32–42 and cups A–E in most stores. Mid-market price point. Bands and cups run true to UK standard in wire styles; wireless styles run slightly generous in the cup.
Fit: True to IE/UK in wired styles. Cups run slightly generous in soft-cup and wireless styles — consider sizing down one cup in Dunnes wireless bras if between sizes. Good value for A–D cup everyday basics.
Penneys / Primark IE
Penneys (the Irish name for Primark) operates across Ireland using UK sizing — the same products as Primark UK. Stocks IE 30–42 and cups A–E in most stores. Budget price point. Cup grading runs true to UK standard in moulded styles; wire styles can run slightly shallow. Very limited above E cup.
Fit: True to IE/UK band. Moulded cups run true; wire cups run slightly shallow — size up one cup in Penneys wired bras if between cup sizes. Best value for A–C cup basics. Not suitable as a fitting reference due to variable construction quality.
Next IE
UK fashion retailer with Irish stores and strong next.ie online business. Uses UK sizing throughout. Stocks IE 30–44 and cups A–G in most styles. Next IE bras are identical to Next UK — same product, same sizing. Mid-market quality with good range coverage through G cup.
Fit: True to IE/UK size. Next is reliable for A–E cup in everyday and occasion styles. Their G cup range is accessible where Dunnes and Penneys stop. Bands run true; cups grade consistently through the range.
Bravissimo (ships to IE)
UK D+ specialist. Ships to Ireland with returns available. Stocks D–L cup across IE 28–42 bands. Dedicated DD+ specialist range — the single most comprehensive D+ option accessible to Irish shoppers. Panache, Freya, Fantasie, Curvy Kate, and own-brand all stocked in UK sizing identical to Irish sizing.
Fit: True to IE/UK size. No conversion needed from your Irish size. Bravissimo’s range starts where M&S DD+ ends — for FF cup and above in Ireland, Bravissimo is the primary accessible option. Free returns on qualifying orders to Ireland.
ASOS IE
ASOS ships to Ireland from ASOS.com using UK sizing. Multi-brand — stocks UK brands (Bravissimo sub-brands, Freya, Panache, Calvin Klein UK) alongside EU brands (Triumph EU, Sloggi EU). UK brands use inch-based IE/UK bands. EU brands on ASOS may use EU cm bands. Check each product’s size guide before ordering.
Fit tip: For UK/IE brands on ASOS: your Irish size converts directly. For EU brands on ASOS: convert IE 34 → EU 75, IE 36 → EU 80. Add one cup letter above DD when converting IE to EU (IE DD → EU E). The product size guide on ASOS is the authoritative reference for each brand.
John Lewis (ships to IE)
Premium UK department store. Ships to Ireland. Uses UK sizing — identical to Irish sizing. Stocks IE 28–46 and cups A–K in their full lingerie range. John Lewis stocks Chantelle, Simone Pérèle, Panache, Freya, Wacoal UK, and own-brand all in UK/IE inch sizing. Premium quality across the range.
Fit tip: No conversion needed from Irish size. Note that Chantelle sold through John Lewis UK uses UK band sizing — identical to Irish sizing — rather than their French FR band numbers. John Lewis UK Chantelle 34DD = Irish 34DD.
Marks & Spencer UK (ships to IE)
M&S UK ships to Ireland in addition to their Republic of Ireland stores. UK website M&S sizes are identical to Irish M&S store sizes — no conversion needed. Online access to the full M&S range including sizes not stocked in every Irish store. Free collection from Irish stores on M&S.ie orders.
Fit tip: No conversion needed. M&S IE and M&S UK are the same sizing system. The online range often includes extended cup sizes (HH, J) not stocked in smaller Irish stores. M&S.ie and marksandspencer.com both ship to Irish addresses.
Signs Your Irish Bra Size Is Wrong
Band size problems
- Band rides up at the back: band too big. Try 2 inches smaller, one cup up (IE 36C → 34D).
- Band digs in or leaves marks: band too small. Try 2 inches larger, one cup down (IE 34D → 36C).
- Band pulls forward when arms are raised: band too loose. Tighten hooks or go down 2 inches.
Cup size problems
- Spillover at top or sides: cup too small. Size up one letter (IE 34DD → 34E).
- Gaping, wrinkling or empty space: cup too big. Size down one letter (IE 34DD → 34D).
- Underwire sitting on breast tissue: cup too small. Size up immediately.
- Centre gore not flat against sternum: cup too small or wire too wide for breast spacing.
- Shoulder straps digging in: band too large — the straps are bearing weight the band should carry.
M&S Ireland’s national fitting data — mirroring the UK pattern — shows the majority of Irish women are wearing an incorrectly sized bra. The most common error is wearing a band 2–4 sizes too large and a cup 2–3 letters too small (e.g., wearing a 36B when 32DD is the correct size). If you have never had a professional fitting, or haven’t measured in the last 12 months, your current size is likely incorrect. M&S Ireland’s free in-store fitting service is the most accessible first step.
Shopping International Brands from Ireland
Buying from UK retailers (M&S UK, Bravissimo, John Lewis, ASOS UK)
No conversion needed. IE 34DD = UK 34DD. Shop in your exact Irish size from any UK retailer. All major UK retailers — ASOS UK, M&S, Bravissimo, John Lewis, Next UK — ship to Irish addresses in many cases using the same platforms as their Irish retail operations.
Buying from EU retailers (Triumph EU, Hunkemöller)
IE band to EU band: IE 30 = EU 65, IE 32 = EU 70, IE 34 = EU 75, IE 36 = EU 80, IE 38 = EU 85. Cup: IE A–D = EU A–D (identical). Above D: IE DD = EU E, IE E = EU F, IE F = EU G, IE FF = EU H, IE G = EU I. So IE 34DD = EU 75E at Triumph Germany. Add one cup letter when converting IE to EU above D.
Buying from US retailers (Victoria’s Secret US, ThirdLove)
IE band to US band: identical numbers (IE 34 = US 34). Cup: IE A–D = US A–D. Above D: IE DD = US DD, IE E = US DDD, IE F = US DDDD. So IE 34E = US 34DDD. US bands run slightly small — size up one US band if borderline. Victoria’s Secret does not stock above US DDD (= IE E).
Buying from French brands (Chantelle, Simone Pérèle)
FR band = IE band + 16 (approximately): IE 34 → FR 90. IE 36 → FR 95. FR cup letters are EU-style — one step ahead of IE above D: FR E = IE DD, FR F = IE E. So IE 34DD = FR 90E at Chantelle. Add ~16 to your IE band (or use the conversion table) and add one cup letter above D.
When shopping ASOS.ie or ASOS.com from Ireland, check whether each brand uses UK inch bands or EU cm bands. UK brands (Bravissimo sub-brands, Panache, Freya, Curvy Kate, Calvin Klein UK) use inch-based bands identical to Irish sizing. EU brands (Triumph EU, Sloggi EU, Chantelle on some listings) may use EU cm bands or FR bands. The band number identifies the system: 28–46 = UK/IE/US; 60–110 = EU; 75–125 = FR. The product’s individual size guide on ASOS is authoritative.
Recommended Bras in Irish/UK Sizing
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- IE/UK bands 30–46, cups A–H
- Three-section cup, wide straps
- Body by M&S, Post-Surgery styles
- IE/UK bands 28–42, cups D–L
- Soft lining, underwire precision
- Panache, Cleo, Sculptresse styles
- IE/UK bands 28–42, cups A–K
- Seamless moulded cup
- Deco, Freya Active styles
- IE/UK bands 30–42, cups C–L
- High impact, encapsulation design
- Panache Sport styles
Frequently Asked Questions
Ireland uses UK bra sizing — inch-based band numbers (28, 30, 32, 34, 36, 38, 40) and UK cup letters (A, B, C, D, DD, E, F, FF, G). There is no separate Irish sizing convention. All major Irish retailers — M&S Ireland, Dunnes Stores, Penneys, Next Ireland, Bravissimo, and ASOS IE — use UK sizing without modification. An Irish 34DD and a UK 34DD are identical in every respect.
Yes — completely identical. IE 34DD equals UK 34DD. Irish bra sizing is the UK system applied without any modification or conversion. Shopping from UK retailers in your Irish size requires no adjustment — your Irish 34DD at M&S Ireland is exactly the same size as 34DD at M&S UK, Bravissimo, or John Lewis.
IE 34DD equals EU 75E. The band converts from IE 34 (inches) to EU 75 (cm, underbust 68–72 cm). The cup converts from IE DD to EU E — one step ahead in EU notation above D cup. IE DD = EU E, IE E = EU F, IE F = EU G. So if you wear 34DD from M&S Ireland and shop Triumph Germany online, you would order EU 75E.
IE 34DD equals US 34DD. The US band is the same number as the IE/UK band. The US cup below E is identical to IE/UK — DD = DD in both systems. Above D: IE E = US DDD, IE F = US DDDD. So IE 34DD equals US 34DD directly, with no conversion needed for the band or the cup at DD level.
M&S Ireland offers free in-store bra fittings at all their Republic of Ireland stores — the most widely available fitting service in the country. Dunnes Stores offers fittings at selected larger stores. Bravissimo, while not having Irish stores, ships to Ireland with free returns on qualifying orders, making them accessible for the DD+ market. Many independent lingerie boutiques across Dublin, Cork, Galway and other cities also offer professional fitting services.
IE band to EU band: IE 30 = EU 65, IE 32 = EU 70, IE 34 = EU 75, IE 36 = EU 80, IE 38 = EU 85. Cup through D: identical. Above D: IE DD = EU E, IE E = EU F, IE F = EU G, IE FF = EU H. So IE 34E = EU 75F at Triumph, Intimissimi, or Selmark. Add one cup letter when converting IE to EU above D cup.
Sister sizes step in 2-inch band increments with one cup letter shift. From IE 34DD, the sister sizes are IE 32E (tighter band, same cup volume) and IE 36D (looser band, same cup volume). Particularly useful when shopping M&S Ireland or Bravissimo online when a specific IE size is out of stock. All three sizes contain the same breast volume — only the band tension differs.
Yes — completely identical. Penneys and Primark are the same company (Primark’s parent is Associated British Foods; Penneys is the Irish trading name used since 1969). Their bras use UK sizing throughout — Penneys IE 34DD and Primark UK 34DD are the same product with the same sizing. Shopping Primark UK online and comparing with Penneys Ireland gives identical sizes.
M&S Ireland’s national fitting data suggests 34B and 34C are the most commonly purchased sizes in Ireland, reflecting the same pattern as M&S UK. However, M&S fitting specialists report the true measured average for Irish women is closer to 34D or 32DD when accurately measured — consistent with the UK national finding that the average woman is in a cup size larger than she currently wears. The discrepancy reflects widespread under-cupping and band-sizing errors.
Every six months at minimum, or after weight changes of 5 lb (2.5 kg) or more, pregnancy, breastfeeding, or starting or stopping hormonal contraception. M&S Ireland recommends annual professional fittings. Most Irish women who remeasure after more than a year find their size has shifted by at least one band or cup step.
ASOS ships to Ireland. UK brands on ASOS (Bravissimo sub-brands, Freya, Panache, Curvy Kate) use IE/UK inch bands — shop in your exact Irish size. EU brands on ASOS (Triumph EU, Sloggi) may use EU cm bands — convert: IE 34 to EU 75, IE 36 to EU 80, and add one cup letter above DD (IE DD to EU E). Check the brand’s individual size guide on the product page to confirm which system applies.
Yes — Indian bra sizing uses the same UK-style cup letters (A, B, C, D, DD, E, F) and the same inch-based band numbers as Irish sizing. IE 34DD = IN 34DD. Indian brands (Enamor, Triumph India, Zivame) follow UK sizing conventions. When buying from Indian online retailers, your Irish size converts directly with no adjustment needed.
M&S Ireland stocks through J cup (IE 28–46 bands) in extended styles available online via M&S.ie. Bravissimo, which ships to Ireland, offers up to L cup and beyond in specialist brands. In-store at Dunnes and Penneys, the range typically extends to E or F cup with limited larger-band stock. For HH cup and above or bands above 40, M&S.ie and Bravissimo are the primary accessible options for Irish shoppers.
Related Calculators & Guides
- UK Bra Size Calculator
- EU Bra Size Calculator
- US Bra Size Calculator
- Australian Bra Size Calculator
- India Bra Size Calculator
- Canada Bra Size Calculator
- France Bra Size Calculator
- Germany Bra Size Calculator
- Italy Bra Size Calculator
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- New Zealand Bra Size Calculator
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- All Country Calculators
- Global Bra Size Converter
- Free Bra Size Calculator
- Sister Size Calculator
- Cup Size Calculator
- Complete Bra Size Chart
- How to Measure Bra Size
- Common Bra Fit Problems
- Breast Shape Identifier
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