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Asian Bra Size Calculator
Calculate JIS metric bra sizes (65–100 cm) with 2.5cm cup intervals and Japanese push-up fit adjustments.
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About Asian Bra Size Calculator
Precision Asian bra size calculator based on Japanese Industrial Standards (JIS L4006), Chinese GB/T, and Korean KS norms. Converts metric cm measurements into exact cup letters (AA to I) with shopping fit adjustments for Wacoal, Peach John, and Aimerfeel.
How does Japanese and East Asian (JIS L4006) bra sizing work?
Asian bra sizing follows Japanese Industrial Standard (JIS L4006), Chinese National Standard (GB/T 14232), and Korean Standard (KS K9404). Underbust bands are measured in centimeters and rounded to the nearest 5 cm increment (Band 65, 70, 75, 80, 85, 90, 95, 100). Cup sizes are calculated using precise 2.5 cm differences between fullest bust and snug underbust: AA (7.5 cm), A (10 cm), B (12.5 cm), C (15 cm), D (17.5 cm), E (20 cm), F (22.5 cm), G (25 cm), H (27.5 cm), and I (30 cm).
JIS L4006 Metric Bra Sizing Reference Table (Bands 65 to 90 cm)
↔ Swipe table horizontally to see full bust measurements across JIS cups
| JIS Band (Underbust) | Cup A (+10cm) | Cup B (+12.5cm) | Cup C (+15cm) | Cup D (+17.5cm) | Cup E (+20cm) | Cup F (+22.5cm) | US/UK Band Eq |
|---|---|---|---|---|---|---|---|
| 65 (63–67 cm) | 75 cm bust | 77.5 cm bust | 80 cm bust | 82.5 cm bust | 85 cm bust | 87.5 cm bust | 30 Band |
| 70 (68–72 cm) | 80 cm bust | 82.5 cm bust | 85 cm bust | 87.5 cm bust | 90 cm bust | 92.5 cm bust | 32 Band |
| 75 (73–77 cm) | 85 cm bust | 87.5 cm bust | 90 cm bust | 92.5 cm bust | 95 cm bust | 97.5 cm bust | 34 Band |
| 80 (78–82 cm) | 90 cm bust | 92.5 cm bust | 95 cm bust | 97.5 cm bust | 100 cm bust | 102.5 cm bust | 36 Band |
| 85 (83–87 cm) | 95 cm bust | 97.5 cm bust | 100 cm bust | 102.5 cm bust | 105 cm bust | 107.5 cm bust | 38 Band |
| 90 (88–92 cm) | 100 cm bust | 102.5 cm bust | 105 cm bust | 107.5 cm bust | 110 cm bust | 112.5 cm bust | 40 Band |
The Japanese Push-Up / Molded Cup Rule (+1 Cup Adjustment)
Popular Japanese and East Asian lingerie brands like Peach John, Aimerfeel, and Wacoal Japan design bra cups shallower with narrower underwires and built-in crescent padding (レモンパッド / "lemon pads"). If you are purchasing a molded demi or push-up bra, the industry recommendation is to size up by ONE cup letter (e.g., if you measure a technical 70D, purchase a 70E in push-up styles) to avoid quadri-boob spillage.
What are Japanese bra "cookies" (Lemon Pads)?
Most Japanese bras include removable crescent-shaped foam or silicone cushions inside the lower cup pocket called "cookies" (レモンパッド). If your breasts are slightly asymmetrical or if the cup feels slightly snug, removing the cookie on your fuller breast immediately balances fit without needing a different bra size.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Asian Bra Size Calculator on Wikipedia. More: all calculators.
Frequently Asked Questions about Asian Bra Size Calculator
What is a US 32C in Japanese JIS sizing?
A US 32C converts to a Japanese 70D in unpadded styles, or a 70E in padded push-up styles from brands like Peach John or Aimerfeel.
What does 75D mean in Asian sizing?
A 75D indicates a 73–77 cm underbust with an approximate 17.5 cm difference between bust and underbust (around 92.5 cm bust). It equals a US/UK 34C or 34D.
Why do Asian bras feel smaller than Western bras?
Asian lingerie brands are engineered for East Asian body frames with narrower ribcages, narrower breast roots, and shallower cup projection. Western bras have deeper projection and wider underwire arcs. Consequently, Western shoppers usually need 1 cup size larger in Asian brands.
How does Chinese GB/T sizing compare to Japanese JIS?
Chinese GB/T 14232 sizing uses the exact same metric band (70, 75, 80) and 2.5 cm cup differences (A, B, C, D) as Japanese JIS L4006. Sizing is directly interchangeable across Chinese and Japanese manufacturers.
What is a sister size for a Japanese 70E?
The firmer sister size is 65F (smaller band, larger cup). The looser sister size is 75D (larger band, smaller cup). Both hold the exact same volume of breast tissue as 70E.
Do Asian bra bands stretch as much as Western bras?
No. Asian bra bands typically use firmer, denser power-mesh fabrics with lower elastane ratios to enforce upright posture. Always fasten a new Asian bra on the outermost (loosest) hook row.
Are Japanese cup sizes (E, F, G) considered plus-size?
No. Because Asian cups progress by 2.5 cm (compared to 1 inch / 2.54 cm) and cups are cut shallow, an Asian E cup is roughly equivalent to a Western C or D cup, and an F cup is equivalent to a Western D or DD cup.
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