Apex Conversion

👙 JP Bra Size to US Bra Size Converter

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

Share𝕏 PostFacebookLinkedInReddit

Result

34C

75C JP = 34C US

JP Bra Size to US Bra Size Conversion Table

JP SizeUS Size
65A JP30A US
65B JP30B US
65C JP30C US
65D JP30D US
65E JP30DD US
65F JP30DDD US
70A JP32A US
70B JP32B US
70C JP32C US
70D JP32D US
70E JP32DD US
70F JP32DDD US
75A JP34A US
75B JP34B US
75C JP34C US
75D JP34D US
75E JP34DD US
75F JP34DDD US
80A JP36A US
80B JP36B US
80C JP36C US
80D JP36D US
80E JP36DD US
80F JP36DDD US

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 JP Bra Size to US Bra Size Conversions

This free JP to US 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 JP Bra Size to US Bra Size conversions. All calculations follow internationally recognized standards.

Frequently Asked Questions

How do I convert JP Bra Size to US 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 US Bra Size are in 1 JP Bra Size?

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

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

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

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

Use US sizing when shopping brands that label their products in the US 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

US Bra Size → JP Bra SizeUnited States (US) → European (EU)European (EU) → United States (US)United States (US) → United Kingdom (UK)United Kingdom (UK) → United States (US)
← View full Bra Size Converter

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.