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👙 US Bra Size to JP Bra Size Converter

Free online tool to convert US bra sizes to JP. Enter your band and cup size for an instant, accurate result — band and cup both converted.

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Result

75C

34C US = 75C JP

US Bra Size to JP Bra Size Conversion Table

US SizeJP Size
30A US65A JP
30B US65B JP
30C US65C JP
30D US65D JP
30DD US65E JP
30DDD US65F JP
32A US70A JP
32B US70B JP
32C US70C JP
32D US70D JP
32DD US70E JP
32DDD US70F JP
34A US75A JP
34B US75B JP
34C US75C JP
34D US75D JP
34DD US75E JP
34DDD US75F JP
36A US80A JP
36B US80B JP
36C US80C JP
36D US80D JP
36DD US80E JP
36DDD US80F JP

Conversion Formula

Band conversion reference:
  US/UK:  28   30   32   34   36   38   40   42   44
  EU:     60   65   70   75   80   85   90   95  100
  FR:     75   80   85   90   95  100  105  110  115
  AU:      6    8   10   12   14   16   18   20   22
  JP/RU/KR: same as EU

Cup conversion — canonical index (12 sizes, index 0–11):
  US:     AA  A   B   C   D   DD  DDD  G   H   I   J   K
  UK/AU/FR: AA  A   B   C   D   DD   E   F  FF   G  GG   H
  EU/JP/RU/KR: AA  A   B   C   D   E   F   G   H   I   J   K

Common mistakes:
  US DDD ≠ UK DDD — US DDD = UK E
  US G ≠ EU G — US G = EU G (index 7 matches here)
  US DD = UK DD (same), but US DD = EU E (different)

About US Bra Size to JP Bra Size Conversions

This free US to JP bra size converter handles both band and cup sizes accurately — including the differences between US DDD, UK E, and EU F at the larger end of the scale. Select your band and cup below for an instant result.

This conversion uses a non-linear (reciprocal) relationship, so a simple multiplication factor does not apply. The formula section below explains the method, and the reference table shows common converted values.

Below you will find a pre-calculated conversion table, the exact formula used, and answers to common questions about US Bra Size to JP Bra Size conversions. All calculations follow internationally recognized standards.

Frequently Asked Questions

How do I convert US Bra Size to JP Bra Size?

This conversion is non-linear. Use the calculator above for accurate results, or refer to the formula section on this page.

How many JP Bra Size are in 1 US Bra Size?

The relationship between US Bra Size and JP Bra Size is non-linear. Use the calculator above or the reference table on this page for specific values.

Is US Bra Size larger or smaller than JP Bra Size?

The size relationship between US Bra Size and JP Bra Size depends on the input value because this conversion is non-linear (reciprocal).

When would I use JP Bra Size instead of US Bra Size?

Use JP sizing when shopping brands that label their products in the JP system — for example, European luxury brands, UK high street stores, or Japanese lingerie retailers. Always verify sizing with the brand's own chart, as fit can vary by style and manufacturer even within the same system.

Why doesn't my cup letter stay the same when converting between systems?

Cup letters are only consistent up to D cup. From DD upward, the US uses DD, DDD, G, H, I while UK and AU use DD, E, F, FF, G, GG, H, and EU uses E, F, G, H, I. This means US 34DDD = UK 34E = EU 75F. The band number also changes because each system uses a different scale — US in even inches, EU and JP in 5 cm increments, FR adds 15 to the EU number, and AU uses garment numbers.

What is the most common conversion mistake with international bra sizes?

The most common mistakes are (1) keeping the cup letter unchanged when it should change — US DDD is NOT UK DDD, it is UK E; and (2) only converting the band while ignoring the cup. Both band and cup must be converted for an accurate size. A second common mistake is confusing EU and FR sizing: FR sizes are EU + 15 in the band but use the same cup letters.

Related Bra Size Conversions

JP Bra Size → US Bra SizeUnited States (US) → European (EU)European (EU) → United States (US)United States (US) → United Kingdom (UK)United Kingdom (UK) → United States (US)
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All conversion results are provided for general informational purposes only. Our formulas use internationally recognized conversion factors; however, rounding may affect precision. Do not rely on these results for professional, medical, legal, or engineering decisions without independent verification. Read our full disclaimer.