China Bra Size Calculator & Converter
Calculate your Chinese bra size in centimetres (AA–H cup system, GB/T 6411 standard), convert instantly to UK, US, AU & EU — with sister sizes and Aimer, NEIWAI, Cosmo Lady, Embry Form & Triumph China 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 CN Size
Top-rated Chinese and Asian brands available internationally — verified for CN sizing.
- CN bands 70–90, cups AA–E
- Seamless, wire-free comfort
- Aimer, NEIWAI, Triumph CN styles
- CN bands 70–85, cups A–D
- Smooth finish, minimal seams
- Cosmo Lady, Embry Form styles
Measure in centimetres to get your accurate Chinese bra size
What Is the Chinese Bra Sizing System?
Chinese bra sizing follows GB/T 6411, the national standard set by the Standardization Administration of China. It is centimetre-based: band sizes (60, 65, 70, 75, 80, 85, 90, 95, 100) represent your underbust measurement rounded to the nearest 5 cm. Cup size is derived from the difference between overbust and underbust using 2.5 cm intervals — the same interval logic as Japan and Korea — in a sequence of AA, A, B, C, D, E, F, G, H. There is no DD, DDD, or FF notation. CN E cup equals UK DD. Aimer, NEIWAI, Cosmo Lady, Embry Form, and Triumph China all follow this standard.
China has the world’s largest lingerie market by volume, accounting for over 30% of global bra production and an increasingly sophisticated domestic retail landscape driven by brands like Aimer (爱慕), NEIWAI (内外), and the rapidly growing direct-to-consumer sector on Taobao, Tmall, and JD.com. Understanding Chinese bra sizing has become essential for international shoppers engaging with Chinese fashion platforms and for the large global Chinese-speaking diaspora purchasing from both domestic and international retailers.
The Chinese standard GB/T 6411 shares its fundamental architecture with Japanese (JIS L 4006) and Korean (KS K 0050) standards — all three use centimetre-based bands and 2.5 cm cup intervals. The key distinction is that GB/T 6411 begins at AA cup rather than AAA, and the cup sequence runs through H without any doubled-letter designations. A Chinese E cup represents the same breast volume as a Japanese or Korean E cup, making cross-referencing between these three systems straightforward.
The surge in global interest in Chinese fashion through platforms like Shein, Taobao Global, and NEIWAI’s international shipping has made CN-to-UK/US conversion a daily necessity for international shoppers. The cup-letter shift above D — where CN E = UK DD — is the most common source of ordering errors, typically resulting in cups that are one full size too large when a shopper applies UK cup logic to a CN label.
CN bands are underbust cm rounded to nearest 5 — per GB/T 6411.
CN cups start at AA — no AAA, no DD notation. Each step is 2.5 cm of additional volume.
- Chinese sizing follows GB/T 6411 — centimetre bands (60–100) and AA–H cup sequence with 2.5 cm intervals
- CN 75C = UK 34C = US 34C = EU 75C — bands align directly with EU; cups A–D align with UK
- CN E cup = UK DD = US DD — the one-letter shift above D is the most important conversion rule
- No AAA cup in the CN system — smallest is AA, unlike Japan/Korea which include AAA
- Aimer and NEIWAI are the CN market reference brands — use them as calibration before ordering other Chinese labels
- CN band = EU band exactly; CN band to UK/US requires dividing by ~2.54 and rounding to even inch
How to Measure Your Chinese Bra Size
Chinese sizing is centimetre-based with no offsets or padding. 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. Aimer’s official fitting guides recommend measuring without any bra for maximum accuracy — consistent with the approach recommended by Wacoal Japan and Vivien Korea for the same centimetre-based systems.
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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 Chinese band size is your underbust rounded to the nearest 5 cm: 74 cm rounds to CN 75, 78 cm rounds to CN 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 CN band
Round underbust to nearest 5 cm: 58–62 cm = CN 60, 63–67 cm = CN 65, 68–72 cm = CN 70, 73–77 cm = CN 75, 78–82 cm = CN 80, 83–87 cm = CN 85, 88–92 cm = CN 90, 93–97 cm = CN 95. If exactly on a boundary, try the smaller band first.
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Calculate your CN cup letter
Subtract underbust from overbust in cm using 2.5 cm steps: 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. Note: differences below 7.5 cm also fall in AA.
Aimer recommends remeasuring every six months and specifically before buying from Taobao, Tmall, or JD.com brands. Fast-fashion CN brands frequently use simplified sizing (S/M/L bands rather than true cm bands) alongside GB/T 6411-labelled products — always check whether the product page specifies a cm band number or a generic S/M/L sizing before ordering online.
Skip the calculation — use the calculator
Enter your measurements once and get your exact CN size plus conversions to UK, US, EU, AU and FR instantly.
Open the China Bra Size Calculator →Chinese Bra Size Chart (Underbust cm Reference)
This chart is the standard CN sizing reference aligned with GB/T 6411, used by Aimer, NEIWAI, Cosmo Lady, Embry Form, and all major Chinese lingerie retailers.
Chinese sizes compared with UK, US, EU, AU, and FR systems
| CN Band (cm) | UK / US Band | EU Band | FR Band | AU Band | Underbust (cm) |
|---|---|---|---|---|---|
| CN 60 | 28 | EU 60 | FR 75 | AU 4 | 53–62 |
| CN 65 | 30 | EU 65 | FR 80 | AU 6 | 58–67 |
| CN 70 | 32 | EU 70 | FR 85 | AU 8 | 63–72 |
| CN 75 | 34 | EU 75 | FR 90 | AU 10 | 68–77 |
| CN 80 | 36 | EU 80 | FR 95 | AU 12 | 73–82 |
| CN 85 | 38 | EU 85 | FR 100 | AU 14 | 78–87 |
| CN 90 | 40 | EU 90 | FR 105 | AU 16 | 83–92 |
| CN 95 | 42 | EU 95 | FR 110 | AU 18 | 88–97 |
| CN 100 | 44 | EU 100 | FR 115 | AU 20 | 93–102 |
Chinese Cup to UK, US, EU, AU Conversion
CN cup letters align with UK, US, and AU cups from AA through D. Above D, a one-letter shift applies: CN E = UK DD. This mirrors the same conversion used in Japanese and Korean sizing systems.
| CN Cup | UK / AU Cup | US Cup | EU Cup | Overbust − Underbust (cm) |
|---|---|---|---|---|
| AA | AA | AA | AA | under 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 error among international shoppers buying from Taobao, Tmall, or NEIWAI’s global site is assuming CN E cup equals UK E cup. It does not. CN E equals UK DD — the same one-letter shift that applies in Japanese and Korean sizing above D cup. A Chinese shopper who knows they wear CN 75E and orders UK 34E from Bravissimo will receive a bra one full cup size too large. The correct UK equivalent for CN 75E is UK 34DD. CN D equals UK D exactly — the shift applies only from E cup upward.
What Are Sister Sizes in Chinese Bras?
Sister sizes in the CN system work identically to other centimetre systems — bands step in 5 cm, cups shift by one letter.
The sister size rule
- Smaller band, larger cup: If your CN 75C band rides up, try CN 70D. Same volume, 5 cm tighter.
- Larger band, smaller cup: If your CN 75C band digs in, try CN 80B. Same volume, 5 cm looser.
| CN Size | UK Equiv. | Band Feel | Cup Volume |
|---|---|---|---|
| CN 70D | 32D UK | Tighter | Same as CN 75C |
| CN 75C | 34C UK | Standard | Your primary size |
| CN 80B | 36B UK | Looser | Same as CN 75C |
Chinese lingerie ranges from precision-fit structured bras (Aimer, Embry Form) to minimal bralettes (NEIWAI)
Chinese Bra Brand Sizing Differences
Chinese brands follow GB/T 6411 closely but vary significantly in construction philosophy — from Aimer’s precision engineering to NEIWAI’s minimal-fabric aesthetic and Cosmo Lady’s value-market approach.
Aimer (爱慕)
China’s leading premium lingerie brand, established 1993. Aimer’s sizing is the Chinese market reference — their cup grading follows GB/T 6411 precisely. Stocks CN 70–95 bands and AA–G cups. Known for premium fabrics, precision fit, and a full range of styles from everyday basics to luxury lingerie. Available on Tmall and their own ecommerce platform.
Fit: True to CN size. Aimer is the calibration brand for the Chinese market — use it to verify your CN size before ordering other labels. Cups suit medium-to-full projection breast shapes. Aimer’s structured bras run true; their softer styles can be slightly generous in the cup.
NEIWAI (内外)
Contemporary Chinese brand with strong international presence and a minimalist, fabric-first aesthetic. NEIWAI uses CN sizing in their Chinese market products and international sizing (S/M/L) in Western market versions. Their wire-free and bralette styles use CN labelling on Tmall; their global site uses a different size guide. Cup grading follows GB/T 6411 in their structured styles but is slightly less precise in their signature no-wire range.
Fit: Generally true to CN size in structured styles. For NEIWAI’s signature bralette and no-wire range, cup coverage is intentionally minimal — shoppers who prefer full coverage should size up one CN cup. Bands run true. Check product-specific size guides on NEIWAI’s site.
Cosmo Lady (都市丽人)
China’s largest mass-market lingerie brand by store count, with over 7,000 retail locations across China. Cosmo Lady uses CN sizing across all products. Band range CN 70–90 and cups AA–D in their core range, extending to E cup in selected styles. Cup grading follows GB/T 6411 through D cup; above D, the range is limited. Cosmo Lady’s bands run true to standard.
Fit: True to CN size through D cup. Limited range above D — shoppers in CN E cup and above should look to Aimer or Embry Form. Cosmo Lady’s value-market construction is functional rather than precision-fit; expect less refinement in cup shaping compared to Aimer.
Embry Form (安莉芳)
Hong Kong-origin brand with extensive retail presence across mainland China and Southeast Asia. Embry Form uses CN sizing on Chinese-market products. Known for structured underwire bras in a wide band range (CN 70–95) and cup range (AA–G). Embry Form’s cup grading is slightly more generous than Aimer in padded styles, similar to Wacoal Korea’s approach to their padded range.
Fit: True to CN size in unpadded styles. In padded styles, consider one cup down from your Aimer size. Embry Form specialises in structured underwire — their wire-free range is more limited. Good option for CN D cup and above where Cosmo Lady’s range thins out.
Triumph China
German brand (Triumph) operating in China using CN sizing on Chinese-market products. Triumph China’s sizing follows GB/T 6411 — the same standard as Aimer. Their cup grading is consistent with the German Triumph standard adapted to CN cm intervals. Stocks CN 70–90 bands and AA–E cups in their main Chinese range. Available in Chinese department stores and online.
Fit: True to CN size. Triumph China’s cups tend to suit medium-depth breast shapes. Their wireless styles run slightly softer in the band — try the smaller CN band first if between sizes. Good international crossover option for shoppers who also buy from Triumph’s European range.
La Perla China
Italian luxury brand available in China through their flagship stores and Chinese department store concessions. La Perla China uses EU sizing in their boutiques rather than CN sizing — bands match (CN 75 = EU 75) but labels display the EU number. Cup letters align with CN through D cup; above D the EU notation also matches CN (CN E = EU E, unlike UK where CN E = UK DD). La Perla’s Chinese retail is premium priced.
Conversion: La Perla in China uses EU labelling. CN 75E = EU 75E at La Perla China — no cup adjustment needed since EU and CN cup letters align above D. Simply match your CN band to the EU band number on the La Perla label.
Victoria’s Secret China
Available in China using US sizing. Band conversion: CN 75 = US 34, CN 80 = US 36. Cup conversion: CN AA = US AA, CN A–D = US A–D. Above D: CN E = US DD, CN F = US DDD. VS does not stock above US DDD (= CN F), limiting options for CN G and H cup shoppers. Victoria’s Secret China flagship stores use US sizing throughout.
Conversion: CN 75E → US 34DD. CN 80F → US 36DDD. VS bands typically run small — size up one US band from your CN equivalent if borderline. Note that VS uses US sizing in China, not CN sizing — always convert before entering the store or site.
Bravissimo UK (buying from China)
UK D+ specialist that ships internationally to China. UK cup letters are one step behind CN above D: CN E = UK DD, CN F = UK E, CN G = UK F. Band: CN 75 = UK 34, CN 80 = UK 36. Bravissimo’s D+ range is the most comprehensive international option for CN E cup and above where Chinese domestic retail options become limited outside Aimer and Embry Form.
Conversion: CN 75F → UK 34E at Bravissimo. Drop one cup letter when converting CN to UK above D cup. Bravissimo is the recommended international option for Chinese shoppers in CN E cup and above who want full-coverage structured support.
Signs Your Chinese Bra Size Is Wrong
Band size problems
- Band rides up at the back: band too big. Try CN 5 cm down, one cup up (e.g., CN 80B → 75C).
- Band digs in or leaves marks: band too small. Try CN 5 cm up, one cup down (e.g., CN 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 CN cup letter (CN 75C → 75D).
- Gaping or wrinkling: cup too big. Size down one letter (CN 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.
Many products listed on Taobao and Pinduoduo as CN-sized actually use S/M/L sizing beneath GB/T 6411 labelling — particularly in lower-price segments. A CN 75B label on a Taobao basic-tier product may be cut to a fashion-fit S rather than a true 75 cm band with 12.5–15 cm cup difference. When buying from unfamiliar Taobao sellers, check the centimetre measurements in the product description rather than relying solely on the stated size label. Aimer, NEIWAI, Cosmo Lady, Embry Form, and Triumph CN are the most reliable for true GB/T 6411 sizing.
Why Chinese Bra Sizing Confuses International Shoppers
The cup-letter shift above D
International shoppers buying from Taobao Global, AliExpress, or NEIWAI’s international site frequently assume that CN cup letters match UK or EU cup letters directly. Above D cup, UK alignment requires a one-letter drop: CN E = UK DD (not UK E). The EU system, however, aligns directly with CN above D — CN E = EU E. This means the conversion rule differs depending on which system you are converting to, creating confusion for shoppers who reference a mix of UK and EU sources.
The absence of AAA cup
Chinese sizing begins at AA cup, unlike Japanese (JIS L 4006) and Korean (KS K 0050) systems which include AAA cup for underbust-overbust differences below 7.5 cm. Shoppers accustomed to JP or KR sizing who move to CN sizing will find no AA cup equivalent in Korean-labelled products — the smallest CN designation (AA) covers the same range as both JP AA and JP A cup combined, broadly speaking. This can lead to slight misidentification for very small-busted shoppers switching between CN and JP/KR sizing.
The GB/T 6411 vs platform sizing inconsistency
China’s domestic e-commerce market is vast and largely unregulated in its size labelling at the seller level. While major brands follow GB/T 6411, independent sellers on Taobao and smaller brands on Pinduoduo frequently use custom or simplified sizing that borrows the CN band and cup letter format but does not follow the 2.5 cm interval grading. International shoppers and Chinese shoppers alike must verify centimetre measurements from the product detail page rather than relying on the label alone when shopping outside of established brands.
Our calculator treats Chinese sizing per GB/T 6411 — underbust cm rounded to nearest 5 for the band, 2.5 cm steps from AA for the cup, and the same UK/AU cup shift as the Japan/Korea pages above D (CN E → UK DD, CN F → UK E). EU and CN cup letters are treated as equivalent above D. FR band = EU band + 15. Australian bands follow a dress-size index from the underbust cm range.
Shopping International Brands as a Chinese Shopper
Buying from Japanese or Korean retailers (Wacoal JP, Vivien KR)
CN and JP/KR sizing use the same 2.5 cm cup intervals and the same cm-based band rounding. The key difference is that Chinese sizing starts at AA rather than AAA, and the JP/KR cup sequence includes AAA as a smaller option. For cups A through H, CN and JP/KR sizes describe identical volumes. CN 75C = JP 75C = KR 75C. Shopping from Japanese or Korean retailers in your CN size requires no adjustment for most cup sizes; if you are CN AA, note that JP/KR AA covers a slightly different range.
Buying from UK retailers (Bravissimo, ASOS UK, M&S)
CN band to UK band: CN 70 = UK 32, CN 75 = UK 34, CN 80 = UK 36. Cup: CN AA = UK AA, CN A–D = UK A–D (identical). Above D: CN E = UK DD, CN F = UK E, CN G = UK F, CN H = UK FF. So CN 75F = UK 34E. Drop one cup letter when converting CN to UK above D cup.
Buying from US retailers (Victoria’s Secret, ThirdLove)
CN band to US band: CN 75 = US 34, CN 80 = US 36. Cup: CN AA = US AA, CN A–D = US A–D. Above D: CN E = US DD, CN F = US DDD, CN G = US DDDD. So CN 75F = US 34DDD. US bands run small — size up one US band if borderline between US sizes.
Buying from EU retailers (Triumph DE, Hunkemöller, Simone Pérèle)
CN band = EU band: CN 75 = EU 75, CN 80 = EU 80. Cup: CN AA through H = EU AA through H — CN and EU cup letters align above D unlike UK. So CN 75E = EU 75E at Triumph Germany. This makes EU the simplest conversion for Chinese shoppers — band and cup letters are directly equivalent with no adjustments needed.
When ordering from AliExpress or Taobao Global using Chinese bra sizing, always check the measurement table in the product listing — not just the size label. Verify that the listed underbust range for your stated CN band matches your actual measurement. Listings that show CN 75B but whose measurement table lists an underbust of 80–85 cm are using the label incorrectly. Aimer’s official Tmall flagship is the most reliable source for true GB/T 6411 sizing when shopping on Chinese e-commerce platforms.
Recommended Bras in Chinese Sizing
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- CN bands 70–90, cups AA–E
- Wire-free all-day comfort
- Aimer, NEIWAI, Triumph CN styles
- Smooth under any fabric
- CN bands 70–85, cups A–D
- Triumph CN, Embry Form, Cosmo Lady
- CN E = UK DD, CN F = UK E
- Bands 34–42, cups DD–GG (UK)
- Bravissimo, Panache, Freya
- CN bands 70–85, cups A–E
- High impact, encapsulation design
- Aimer Sports, Triumph CN Active
Frequently Asked Questions
Chinese bra sizing uses centimetre-based band numbers (60, 65, 70, 75, 80, 85, 90, 95, 100) and a cup sequence (AA, A, B, C, D, E, F, G, H) with no doubled letters, per national standard GB/T 6411. 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 is used by Aimer, NEIWAI, Cosmo Lady, Embry Form, and Triumph China.
No. CN E cup equals UK DD — not UK E. The CN system starts from AA, meaning each CN letter above D represents slightly less volume than the same letter in the UK system. CN E (20–22.5 cm) corresponds to UK DD. CN F equals UK E. Chinese shoppers buying from Bravissimo, Panache, or Marks & Spencer should drop one cup letter: CN 75E becomes UK 34DD, not 34E. EU is simpler: CN E = EU E directly.
Aimer’s sales data and market research from NEIWAI identify CN 75B and CN 75A as the most commonly purchased sizes in China. However, fitting research from Aimer and Chinese academic studies on apparel sizing indicate the measured average is closer to CN 75C, with significant under-cupping — many Chinese women wearing A cup when their measurements indicate B. This pattern mirrors findings in Japan and Korea for the same centimetre-based systems.
CN band to UK band: CN 70 = UK 32, CN 75 = UK 34, CN 80 = UK 36. Cups through D: CN A = UK A, CN D = UK D — identical. Above D: CN E = UK DD, CN F = UK E, CN G = UK F, CN H = UK FF. So CN 75F becomes UK 34E at Bravissimo. Drop one cup letter when converting from CN to UK above D cup.
Very similar but not identical. All three systems use centimetre-based bands rounded to the nearest 5 cm and the same 2.5 cm cup interval. The key difference: Chinese sizing (GB/T 6411) starts at AA cup, while Japanese (JIS L 4006) and Korean (KS K 0050) systems include AAA as a smaller designation. For cups A through H, CN = JP = KR in terms of volume. CN 75C = JP 75C = KR 75C for practical shopping purposes.
Measure your underbust snugly in centimetres and round to the nearest 5: 68–72 cm = CN 70, 73–77 cm = CN 75, 78–82 cm = CN 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. Aimer recommends measuring without any bra. Our China calculator accepts centimetres directly.
CN band equals EU band directly: CN 75 = EU 75, CN 80 = EU 80. Cups: CN AA through H equals EU AA through H — unlike UK conversion, there is no cup letter shift above D between CN and EU. CN 75E = EU 75E at Triumph Germany. This makes the EU conversion the simplest: just match band and cup letter directly with no adjustment. For French sizing (FR), add 15 to the CN band: CN 75 = FR 90, CN 80 = FR 95.
For established brands like Aimer and Embry Form on Tmall, use your CN size directly. For smaller independent Taobao sellers, always verify centimetre measurements in the product detail table — many list S/M/L sizing beneath a CN label. Aimer’s official Tmall flagship and NEIWAI’s official store are the most reliable for true GB/T 6411 sizing. When in doubt, message the seller asking for the underbust range for your stated band size.
Sister sizes in the CN system step in 5 cm for the band and one letter for the cup. From CN 75C, the sister sizes are CN 70D (tighter band, same cup volume) and CN 80B (looser band, same cup volume). Particularly useful when shopping on Tmall or JD.com where specific sizes sell out during 6.18 or Double Eleven sales events. Sister sizing works identically to the Japanese and Korean systems.
CN bands step in 5 cm, so boundary measurements are common. If your underbust is exactly 77 cm — the boundary between CN 75 and CN 80 — try CN 75 first. Chinese 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 still tight when breathing deeply after regular wear, try CN 80.
Aimer stocks through CN G cup in selected styles, with bands up to CN 95. Embry Form extends to approximately G cup. For CN H cup — equivalent to UK FF and beyond — UK specialist retailers like Bravissimo and Fantasie who ship internationally to China provide the widest range. Japanese Wacoal and Amazon Japan also stock extended sizes that translate directly to CN sizing for cups A through H.
Every six months at minimum, or after any weight change of 3 kg or more, pregnancy, breastfeeding, or notable changes in fit. Aimer’s fitting guidance recommends remeasuring twice yearly. Most Chinese women who have not measured in over a year will find their size has shifted by at least one cup step — the same finding documented by Wacoal Japan and Vivien Korea in their respective markets.
No. Chinese sizing (GB/T 6411) begins at AA cup, not AAA. The smallest designation is AA, covering an overbust-minus-underbust difference of approximately 7.5–10 cm (and values below 7.5 cm also fall into AA). Japanese and Korean systems include AAA for differences below 7.5 cm, making them slightly more granular at the smallest end of the cup range. If you measure AA in a Chinese context, you would measure AAA in Japanese or Korean sizing if your difference is under 7.5 cm.
Fast-fashion Chinese brands — particularly at lower price points on Taobao, Shein, and Pinduoduo — often use CN labels but cut to fashion proportions rather than GB/T 6411 grading. Cup intervals may be reduced to 2 cm rather than 2.5 cm, and bands may run smaller to accommodate lighter elastic blends. For fashion bralettes and basic bras from non-specialist sellers, size up one CN cup from your Aimer or NEIWAI size. For structured precision bras, Aimer, Embry Form, and Triumph CN follow the GB/T 6411 standard most reliably.
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