Korea Bra Size Calculator & Converter
Calculate your Korean bra size in centimetres (AAA–H cup system, same as Japan), convert instantly to US, UK, AU & EU — with sister sizes and Vivien, Wacoal Korea, BYC, Gunze & SPAO fit notes.
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 level all the way around. Exhale and measure in centimetres.
- Overbust: measure around the fullest part of your bust. Tape should be loose enough to slide a finger underneath.
- Stand naturally — don’t lift arms or lean forward. Both measurements in the same posture.
- Round to the nearest 0.5 cm for best accuracy.
International Size Conversions
Your Sister Sizes (Same Cup Volume)
Recommended Bras in Your KR Size
Top-rated Korean and Asian brands available internationally — verified for KR sizing.
- KR bands 65–90, cups AA–F
- Seamless, wire-free comfort
- Vivien, Wacoal KR styles
- KR bands 65–85, cups A–E
- Smooth finish, minimal seams
- BYC, Gunze, SPAO styles
Measure in centimetres to get your accurate Korean bra size
What Is the Korean Bra Sizing System?
Korean bra sizing is functionally identical to Japanese bra sizing: centimetre-based band numbers (60, 65, 70, 75, 80, 85, 90…) paired with the unique single-letter cup sequence (AAA, AA, A, B, C, D, E, F, G, H) — no DD or DDD notation. Band size is your underbust measurement rounded to the nearest 5 cm. Cup size is calculated from the difference between overbust and underbust in 2.5 cm intervals. The system is codified under Korean Standard KS K 0050, which mirrors Japan’s JIS L 4006. Korean brands Vivien, Wacoal Korea, BYC, Gunze, and SPAO all follow this system.
Korea’s lingerie market is one of the fastest-growing in Asia, driven by the global reach of K-culture and a domestic consumer base that places high value on fit precision and aesthetic quality. Korean bra sizing follows the same centimetre-based system as Japan — both countries independently arrived at nearly identical standards through the mid-20th century, and both remain distinct from the UK/EU/US systems that dominate Western markets.
The most important difference between KR and Western sizing is the cup sequence. Korea does not use DD, DDD, or FF. The progression runs AAA, AA, A, B, C, D, E, F, G, H — ten distinct labels, each a single unique letter or triple-letter designation. A Korean E cup is a very specific volume that sits one step above D — the equivalent of UK DD or US DD — but carries no risk of confusion with doubled-letter notation.
Korea’s influence on global fashion through K-pop, K-drama, and K-beauty has created unprecedented demand for Korean lingerie internationally. Brands like Vivien (established 1974), BYC, and newer fashion-forward labels like SPAO and Mardi Mercredi now ship globally, making understanding Korean bra sizing essential for international shoppers engaging with Korean fashion culture.
KR bands are underbust cm rounded to nearest 5 — identical to JP band logic.
KR cups start at AAA — no DD notation. Each step is 2.5 cm of additional volume.
- Korean sizing is functionally identical to Japanese sizing — same band rounding, same cup sequence (AAA, AA, A–H), same 2.5 cm intervals
- KR 75C = JP 75C = UK 34C = US 34C = EU 75C — directly interchangeable with Japan
- KR E cup = UK DD = US DD = EU E — one step ahead of UK above D, same as JP E
- K-fashion brands (SPAO, Mardi Mercredi) now ship globally in KR sizing — knowing the conversion is essential
- Vivien and Wacoal Korea are the Korean market reference brands — same role as Wacoal Japan in Japan
How to Measure Your Korean Bra Size
Korean sizing is centimetre-based with no offsets. You need your underbust and overbust in centimetres.
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Prepare correctly
Wear a non-padded bra or no bra. Stand naturally with arms relaxed at your sides. Vivien Korea’s fitting guides recommend measuring without any bra for maximum accuracy — the same guidance given by Wacoal Japan.
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Measure your underbust in centimetres
Wrap the tape snugly around your ribcage directly beneath your bust. Keep it level all the way around. Exhale fully and record to the nearest 0.5 cm. Your Korean band size is your underbust rounded to the nearest 5 cm: 74 cm rounds to KR 75, 78 cm rounds to KR 80.
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Measure your overbust in centimetres
Measure around the fullest point of your bust. Keep the tape horizontal and loose enough to slide one finger underneath. Record to the nearest 0.5 cm.
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Calculate your KR band
Round underbust to nearest 5 cm: 58–62 cm = KR 60, 63–67 cm = KR 65, 68–72 cm = KR 70, 73–77 cm = KR 75, 78–82 cm = KR 80, 83–87 cm = KR 85, 88–92 cm = KR 90, 93–97 cm = KR 95. If exactly on a boundary, try the smaller band first.
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Calculate your KR cup letter
Subtract underbust from overbust in cm using 2.5 cm steps: under 7.5 cm = AAA, 7.5–10 cm = AA, 10–12.5 cm = A, 12.5–15 cm = B, 15–17.5 cm = C, 17.5–20 cm = D, 20–22.5 cm = E, 22.5–25 cm = F, 25–27.5 cm = G, 27.5+ cm = H. Identical to the Japanese cup calculation.
Vivien Korea recommends remeasuring every six months and specifically before buying K-fashion bras online. Korean fashion brands from Musinsa, Coupang, or W Concept ship in KR sizing that maps directly to your measurement — but cup grading between fast-fashion Korean brands can vary by 0.5–1 cm per step. When in doubt, size up one cup in fashion-brand bras and size true in Vivien or Wacoal Korea structured bras.
Skip the calculation — use the calculator
Enter your measurements once and get your exact KR size plus conversions to JP, UK, US, AU and EU instantly.
Open the Korea Bra Size Calculator →Korean Bra Size Chart (Underbust cm Reference)
This chart is the standard KR sizing reference aligned with KS K 0050, used by Vivien, Wacoal Korea, BYC, Gunze, and all major Korean lingerie retailers.
Korean sizes compared with JP, UK, US, AU, and EU systems
| KR Band (cm) | JP Band | UK / US Band | AU Band | EU Band | Underbust (cm) |
|---|---|---|---|---|---|
| KR 60 | JP 60 | 28 | AU 4 | EU 60 | 53–57 |
| KR 65 | JP 65 | 30 | AU 6 | EU 65 | 58–62 |
| KR 70 | JP 70 | 32 | AU 8 | EU 70 | 63–67 |
| KR 75 | JP 75 | 34 | AU 10 | EU 75 | 68–72 |
| KR 80 | JP 80 | 36 | AU 12 | EU 80 | 73–77 |
| KR 85 | JP 85 | 38 | AU 14 | EU 85 | 78–82 |
| KR 90 | JP 90 | 40 | AU 16 | EU 90 | 83–87 |
| KR 95 | JP 95 | 42 | AU 18 | EU 95 | 88–92 |
| KR 100 | JP 100 | 44 | AU 20 | EU 100 | 93–97 |
Korean Cup to UK, US, JP, EU, AU Conversion
KR cup letters are identical to JP cup letters. The key conversion rule: KR E = UK DD (not UK E). This one-letter shift above D applies when buying from any UK, Australian, or EU brand.
| KR / JP Cup | UK / AU / IN Cup | US Cup | EU Cup | Overbust − Underbust (cm) |
|---|---|---|---|---|
| AAA | — | — | — | under 7.5 cm |
| AA | AA | AA | AA | 7.5–10 cm |
| A | A | A | A | 10–12.5 cm |
| B | B | B | B | 12.5–15 cm |
| C | C | C | C | 15–17.5 cm |
| D | D | D | D | 17.5–20 cm |
| E | DD | DD | E | 20–22.5 cm |
| F | E | DDD | F | 22.5–25 cm |
| G | F | DDDD/G | G | 25–27.5 cm |
| H | FF | G/H | H | 27.5–30 cm |
A common misconception among K-fashion shoppers is that KR E cup equals UK E cup. It does not. KR E equals UK DD — the same shift that applies in the Japanese system. A Korean shopper in KR 75E who orders UK 34E from Bravissimo will receive a bra one full cup size too large. The correct UK equivalent for KR 75E is UK 34DD. Similarly, KR D is the same as UK D — the shift only begins at E cup and above.
What Are Sister Sizes in Korean Bras?
Sister sizes in the KR system work identically to JP — bands step in 5 cm, cups shift by one letter.
The sister size rule
- Smaller band, larger cup: If your KR 75C band rides up, try KR 70D. Same volume, 5 cm tighter.
- Larger band, smaller cup: If your KR 75C band digs in, try KR 80B. Same volume, 5 cm looser.
| KR Size | JP Equiv. | Band Feel | Cup Volume |
|---|---|---|---|
| KR 70D | JP 70D | Tighter | Same as KR 75C |
| KR 75C | JP 75C | Standard | Your primary size |
| KR 80B | JP 80B | Looser | Same as KR 75C |
Korean lingerie ranges from precision-fit basics (Vivien, Wacoal KR) to K-fashion bralettes (SPAO, Mardi Mercredi)
Korean Bra Brand Sizing Differences
Korean brands follow KS K 0050 closely, but construction and aesthetic vary widely — from precision engineering at Vivien to fashion-forward bralettes at Mardi Mercredi.
Vivien KR
Established in 1974 and South Korea’s largest domestic lingerie brand. Vivien’s sizing is the Korean market reference — their cup grading follows KS K 0050 precisely. Stocks KR 60–90 bands and AAA–H cups. Known for precise fit and quality construction across everyday and sport bras.
Fit: True to KR size. Vivien is the Wacoal of the Korean market — use it as your calibration brand when testing other KR labels. Cups suit medium-projection breast shapes.
Wacoal Korea KR
Korean subsidiary of Wacoal Japan. Uses KR sizing on Korean-market products. Wacoal Korea’s sizing follows KS K 0050 — the same standard as Vivien. Cup grading is slightly more generous than Vivien in structured underwire styles, mirroring Wacoal Japan’s approach.
Fit: True to KR size with cups running slightly generous in padded styles. If ordering Wacoal Korea underwire, size true. If ordering padded, consider one cup down from your Vivien size.
BYC KR
Korean basics and underwear brand. Their bra range uses KR sizing with a focus on affordable everyday styles in bands 65–85 and cups AA–D. BYC bands run true to KR standard. Cup grading follows KS K 0050 through D cup; above D cup, coverage is limited.
Fit: True to KR size through D cup. Limited range above D — shoppers in E cup and above should look to Vivien or Wacoal Korea. Bands are firm — true to standard.
Gunze KR
Japanese brand (Gunze) selling under Korean sizing in the Korean market. Uses KR sizing — not JP sizing on Korean-market labels, though the two are identical. Known for seamless and comfort styles. Stocks KR 65–85 and cups AA–D in their main Korean range.
Fit: True to KR size. Gunze’s seamless construction runs slightly softer in the band — if between sizes, try the smaller band first. Cup grading is true to KS K 0050.
SPAO KR
Korean fast-fashion brand (E-Land Group) popular globally for K-fashion basics. SPAO’s bra range uses KR sizing but follows a simplified band range of 65–80 and cups A–C in bralette styles, and A–D in wire styles. Cup grading is slightly shallow in their bralette range.
Fit: Cups run slightly shallow in bralette styles — size up one KR cup in SPAO bralettes compared to your Vivien size. Wire styles are closer to true KR standard. Limited above C cup.
Mardi Mercredi KR
Trendy Korean fashion brand with a global following through Musinsa and Instagram. Their bra range focuses on fashion-forward bralettes and crop bra styles using KR sizing. Band range KR 65–80, cups A–C. Aesthetic-forward rather than precision-fit — sizing is approximate.
Fit: Size up one KR band in Mardi Mercredi bralettes — their bands run small due to fashion-first construction. Cup sizing is approximate — try before you buy where possible. Best for A–C cup range.
Victoria’s Secret US (buying from Korea)
Available online in Korea using US sizing. Band conversion: KR 75 = US 34, KR 80 = US 36. Cup conversion: KR A–D = US A–D. Above D: KR E = US DD, KR F = US DDD. VS does not stock above US DDD (= KR F), limiting options for KR G and H cup shoppers.
Conversion: KR 75E → US 34DD. KR 80F → US 36DDD. VS bands run small — size up one US band from your KR equivalent if borderline.
Bravissimo UK (buying from Korea)
UK D+ specialist. UK cup letters are one step behind KR above D: KR E = UK DD, KR F = UK E, KR G = UK F. Band: KR 75 = UK 34, KR 80 = UK 36. Ships internationally including Korea — excellent for KR E cup and above where domestic Korean retail options thin out rapidly.
Conversion: KR 75F → UK 34E at Bravissimo. Drop one cup letter when converting KR to UK above D. Bravissimo’s D+ range is the best international option for larger Korean cup sizes.
Signs Your Korean Bra Size Is Wrong
Band size problems
- Band rides up at the back: band too big. Try KR 5 cm down, one cup up (e.g., KR 80B → 75C).
- Band digs in or leaves marks: band too small. Try KR 5 cm up, one cup down (e.g., KR 75C → 80B).
- Band pulls forward when arms are raised: band too loose. Tighten hooks or go down 5 cm.
Cup size problems
- Spillover at top or sides: cup too small. Size up one KR cup letter (KR 75C → 75D).
- Gaping or wrinkling: cup too big. Size down one letter (KR 75C → 75B).
- Underwire on breast tissue instead of flat on ribcage: cup too small. Size up immediately.
- Centre gore not flat against sternum: cup too small or wire width wrong for breast spacing.
K-fashion bralettes and crop bra styles — particularly from Musinsa brands, SPAO, and Mardi Mercredi — are styled for visual appeal and often use lighter-weight materials with less structure than traditional KR bras. Cup grading in these styles can deviate by 0.5–1 cm from the KS K 0050 standard. If you are buying a Korean fashion bra for support rather than aesthetics, verify the cup grading in the brand’s own size guide before ordering.
Why Korean Bra Sizing Confuses International Shoppers
The cup-letter shift above D
International shoppers encountering Korean bra sizing for the first time — through Musinsa Global, Coupang, or W Concept — assume that KR cup letters match UK or EU cup letters directly. Above D cup, they do not. KR E = UK DD (not UK E). This means a shopper who knows they wear UK 34DD will successfully identify their KR size as KR 75E — but must remember to add one cup letter when converting back to UK. The shift is consistent and predictable; the challenge is knowing it exists.
The KR vs JP confusion
Korean and Japanese sizing are so nearly identical that many international guides treat them as the same system. They are effectively interchangeable for practical shopping purposes — KR 75E and JP 75E describe the same cup volume on the same band. The minor technical differences (KS K 0050 vs JIS L 4006) are below the precision of home measurement for the vast majority of shoppers. If you know your JP size, you know your KR size.
The K-fashion sizing inconsistency
The rise of K-fashion globally has introduced a second type of Korean sizing: fashion-brand sizing that uses KR labels but does not follow KS K 0050 grading precisely. SPAO, Mardi Mercredi, and similar brands use KR band and cup labels, but their construction is sized for visual aesthetics rather than anatomical precision. International shoppers ordering from these brands should treat the size label as approximate and consult customer reviews for fit information rather than relying solely on the conversion table.
Our calculator treats Korean sizing as functionally identical to Japanese sizing — the same band rounding (underbust cm to nearest 5), the same cup intervals (2.5 cm steps from AAA), and the same KR-to-UK cup conversion (KR E → UK DD, KR F → UK E). We apply the same international conversion table as the Japan page, producing fully accurate results for JP, UK, US, AU, and EU from a single pair of centimetre measurements.
Shopping International Brands as a Korean Shopper
Buying from Japanese retailers (Wacoal Japan, Triumph JP, Peach John)
KR and JP sizing are directly interchangeable — same band numbers, same cup letters, same volumes. KR 75C = JP 75C. No conversion needed. Shopping from Rakuten, Amazon Japan, or Japanese brand international sites in your KR size produces the correct result with no adjustment.
Buying from UK retailers (Bravissimo, ASOS UK, M&S)
KR band to UK band: KR 70 = UK 32, KR 75 = UK 34, KR 80 = UK 36. Cup: KR A–D = UK A–D (identical). Above D: KR E = UK DD, KR F = UK E, KR G = UK F, KR H = UK FF. So KR 75F = UK 34E. Drop one cup letter when converting KR to UK above D cup.
Buying from US retailers (Victoria’s Secret, ThirdLove)
KR band to US band: KR 75 = US 34, KR 80 = US 36. Cup: KR A–D = US A–D. Above D: KR E = US DD, KR F = US DDD, KR G = US DDDD. So KR 75F = US 34DDD. US bands run small — size up one US band if borderline.
Buying from EU retailers (Triumph DE, Hunkemöller)
KR band = EU band: KR 75 = EU 75, KR 80 = EU 80. Cup: above D, KR E = EU E, KR F = EU F. So KR 75E = EU 75E at Triumph Germany. EU cups run approximately aligned with KR cups above D despite slightly different 2 cm vs 2.5 cm intervals — for practical shopping, treat them as equivalent from D cup upward.
When ordering from Musinsa Global, W Concept, or YesStyle using Korean bra sizing, always check the brand-specific size chart on the product page. K-fashion bra brands use KR labels but may size more like S/M/L than true KS K 0050 grading. Vivien, Wacoal Korea, BYC, and Gunze are the most reliable for true-to-size KR sizing. For fast-fashion brands, read customer reviews that specify the reviewer’s KR size and body measurements.
Recommended Bras in Korean Sizing
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- KR bands 65–90, cups AA–F
- Wire-free all-day comfort
- Vivien, Wacoal KR styles
- Smooth under any fabric
- KR bands 65–85, cups A–E
- Gunze, BYC, Triumph KR styles
- KR E = UK DD, KR F = UK E
- Bands 34–42, cups DD–GG (UK)
- Bravissimo, Panache, Freya
- KR bands 65–85, cups A–E
- High impact, encapsulation design
- Wacoal Sports, Vivien Active
Frequently Asked Questions
Korean bra sizing uses centimetre-based band numbers (60, 65, 70, 75, 80, 85, 90, 95) and a unique single-letter cup sequence (AAA, AA, A, B, C, D, E, F, G, H) with no doubled letters. Band is your underbust cm rounded to the nearest 5. Cup is the difference between overbust and underbust in 2.5 cm steps: 15–17.5 cm = C, 17.5–20 cm = D, 20–22.5 cm = E. The system follows Korean Standard KS K 0050 and is used by Vivien, Wacoal Korea, BYC, Gunze, and SPAO.
Yes — functionally identical. KR 75C equals JP 75C. Both systems use centimetre bands rounded to the nearest 5, the same cup sequence (AAA, AA, A–H), and the same 2.5 cm per cup interval. KS K 0050 and JIS L 4006 arrived at nearly identical standards independently. For all practical shopping purposes, your KR size and JP size are interchangeable — ordering from Japanese retailers in your Korean size requires no conversion.
No. KR cup E equals UK cup DD — not UK E. The KR system starts from AAA, meaning each KR letter above C represents slightly less volume than the same letter in the UK system. KR E (20–22.5 cm) corresponds to UK DD. KR F equals UK E. Korean shoppers buying from Bravissimo, Panache, or Marks and Spencer should drop one cup letter: KR 75E becomes UK 34DD, not 34E.
Vivien Korea’s sales data identifies KR 75B and KR 75A as the most commonly purchased sizes in South Korea, reflecting the smaller average underbust measurement and narrower cup distribution among Korean women compared to Western averages. However, Vivien’s own fitting research suggests the measured average size is closer to KR 75C, with many Korean women wearing A or B cup when their true size is B or C. The same under-cupping pattern seen in Japan and other East Asian markets appears in Korean data.
KR band equals UK band: KR 70 = UK 32, KR 75 = UK 34, KR 80 = UK 36. Cups through D: KR A = UK A, KR D = UK D — identical. Above D: KR E = UK DD, KR F = UK E, KR G = UK F, KR H = UK FF. So KR 75F becomes UK 34E at Bravissimo. Drop one cup letter when converting from KR to UK above D cup.
For precision brands like Vivien and Wacoal Korea on Musinsa Global, use your KR size directly — it converts accurately to your international size using the table above. For K-fashion brands like Mardi Mercredi and SPAO, read the brand’s own size chart and customer reviews that specify the reviewer’s KR size. K-fashion bralettes often run small in the band — size up one KR band from your Vivien size when ordering these styles. W Concept and Musinsa Global display KR sizing throughout.
Sister sizes in the KR system step in 5 cm for the band and one letter for the cup. From KR 75C, the sister sizes are KR 70D (tighter band, same cup volume) and KR 80B (looser band, same cup volume). These are identical to the corresponding JP sizes. Sister sizes are particularly useful when ordering from Korean brand online stores where specific sizes sell out during sales events on Coupang or 11Street.
Measure your underbust snugly in centimetres and round to the nearest 5: 68–72 cm = KR 70, 73–77 cm = KR 75, 78–82 cm = KR 80. Measure your overbust loosely at the fullest point. Subtract underbust from overbust in 2.5 cm steps: 10–12.5 cm = A, 12.5–15 cm = B, 15–17.5 cm = C, 17.5–20 cm = D, 20–22.5 cm = E. Vivien Korea recommends measuring without any bra. Our Korea calculator accepts centimetres directly.
Every six months at minimum, or after any weight change of 3 kg or more, pregnancy, breastfeeding, or notable changes in fit. Vivien Korea’s fitting guidance recommends remeasuring every six months, citing similar seasonal size drift patterns to those documented by Wacoal Japan. Most Korean women who have not measured in over a year will find their size has shifted by at least one cup step.
KR bands step in 5 cm, so boundary measurements are common. If your underbust is exactly 77 cm — the boundary between KR 75 and KR 80 — try KR 75 first. Korean bra bands use elastane blends that relax with wear. A band that feels firm when new will settle to a comfortable fit within a week. If it still feels tight when breathing deeply after regular wear, try KR 80.
Vivien stocks through KR H cup in selected styles, with bands up to KR 95. Wacoal Korea extends to approximately G cup. For H cup and above in KR terms — equivalent to UK FF and beyond — UK specialist retailers like Bravissimo and Fantasie who ship internationally to Korea provide the widest range. Amazon Japan also ships to Korea and stocks Wacoal Japan and Felissimo in extended KR-equivalent sizes.
Yes. KR AAA is the smallest cup in the Korean system, representing an overbust-minus-underbust difference of less than 7.5 cm. It has no direct equivalent in UK, US, or EU systems, which typically start at AA or A cup. KR AAA cup is designed for petite frames with very little breast projection. Vivien and BYC stock AAA cup in their basics range. It does not correspond to a named cup in Western sizing systems.
KR band equals EU band: KR 75 = EU 75, KR 80 = EU 80. Cup alignment above D: KR E and EU E represent approximately the same volume despite using slightly different grading intervals (KR: 2.5 cm per step, EU: 2 cm per step). For practical shopping, treat KR cup letters as equivalent to EU cup letters from D upward. So KR 75E approximately equals EU 75E at Triumph Germany. Below D: KR A through D exactly equals EU A through D.
Related Calculators & Guides
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