Japanese Bra Size to US Conversion Guide

Convert Japanese centimetre bands into US inches and bring back US cup lettering. Follow the chart, step-by-step guide, and fit tips to order from American retailers confidently.

View the conversion chartCheck sister sizes

Covers Japanese bands 60–125 and US bands 28–52 with cups A through H.

Centimetres to inches

Divide the Japanese band by roughly 5 to find the closest US even number (JP 70 → US 30, JP 75 → US 32, etc.).

Add US double letters

Japanese E converts to US DD, Japanese F to US DDD/F, then the alphabet continues with G and H.

Watch default size columns

Retailers might list JP, EU, and US sizes together—use the converted US column when shipping to the States.

Japanese to US band and cup mapping

Use the chart to translate centimetre bands to inches and map cups to US lettering.

JP labelUS labelNotes
65A28AJapanese 65A equals US 28A after converting the band and reintroducing double letters.
65B28BJapanese 65B equals US 28B after converting the band and reintroducing double letters.
65C28CJapanese 65C equals US 28C after converting the band and reintroducing double letters.
65D28DJapanese 65D equals US 28D after converting the band and reintroducing double letters.
65E28DDJapanese 65E equals US 28DD after converting the band and reintroducing double letters.
65F28EJapanese 65F equals US 28E after converting the band and reintroducing double letters.
65G28FJapanese 65G equals US 28F after converting the band and reintroducing double letters.
65H28GJapanese 65H equals US 28G after converting the band and reintroducing double letters.
70A30AJapanese 70A equals US 30A after converting the band and reintroducing double letters.
70B30BJapanese 70B equals US 30B after converting the band and reintroducing double letters.
70C30CJapanese 70C equals US 30C after converting the band and reintroducing double letters.
70D30DJapanese 70D equals US 30D after converting the band and reintroducing double letters.
70E30DDJapanese 70E equals US 30DD after converting the band and reintroducing double letters.
70F30EJapanese 70F equals US 30E after converting the band and reintroducing double letters.
70G30FJapanese 70G equals US 30F after converting the band and reintroducing double letters.
70H30GJapanese 70H equals US 30G after converting the band and reintroducing double letters.
75A32AJapanese 75A equals US 32A after converting the band and reintroducing double letters.
75B32BJapanese 75B equals US 32B after converting the band and reintroducing double letters.
75C32CJapanese 75C equals US 32C after converting the band and reintroducing double letters.
75D32DJapanese 75D equals US 32D after converting the band and reintroducing double letters.
75E32DDJapanese 75E equals US 32DD after converting the band and reintroducing double letters.
75F32EJapanese 75F equals US 32E after converting the band and reintroducing double letters.
75G32FJapanese 75G equals US 32F after converting the band and reintroducing double letters.
75H32GJapanese 75H equals US 32G after converting the band and reintroducing double letters.

Convert your size in four steps

  1. Confirm your Japanese size Measure snug underbust in centimetres or start from a JP bra that fits well.
  2. Translate the band to US inches Use the chart to convert bands like 70, 75, 80 to the nearest US even number.
  3. Fine-tune with sister sizes If the US band feels different, slide to the neighbouring band and adjust the cup accordingly.
  4. Compare fit materials US bras may use different padding or wire shapes—try nearby sizes or read reviews.

Worked conversion examples

JP 70E -> US 30DD

JP 70E converts to US 30DD by dividing the band and adding the US double letter.

JP 75G -> US 32F

JP 75G maps to US 32F—perfect for US department store ordering.

JP 80E -> US 34DD

JP 80E becomes US 34DD, aligning cups without changing volume.

JP 85G -> US 36F

JP 85G translates to US 36F, ideal for cross-border shopping.

Brand sizing cheat sheet

Use these retailer notes to move between Japanese and American labelling.

Japanese retailers

  • Wacoal Store
  • Triumph Store
  • Peach John
  • Aimerfeel

Wacoal Store, Triumph Store, and Peach John show JP sizes first—convert before checking out on US sites.

US-focused brands

  • ThirdLove
  • Soma
  • Bare Necessities
  • Cacique

ThirdLove, Soma, Bare Necessities, and Cacique use inch-based bands—enter the converted US size when ordering.

Global marketplaces

  • Amazon US
  • HerRoom
  • YesStyle
  • Rakuten Global Market

Amazon, HerRoom, and Rakuten Global Market often list both JP and US columns for easy comparison.

Fit tips after converting

  • Use the chart to see which US band sits closest to your centimetre measurement.
  • Account for US double letters so the cup volume remains accurate.
  • Save your JP and US equivalents so you can reorder quickly from either region.

Helpful tools

Interactive bra size calculator

Measure in inches or centimetres and generate both local and international sizes in one place.

Open

International bra size guide

Compare regional systems side by side and review conversion advice for cross-border shopping.

Open

Sister size navigator

Adjust bands tighter or looser while holding cup volume steady after you convert.

Open

Japanese to US conversion FAQ

How do I switch a Japanese band to a US size?

Consult the chart to replace the centimetre band (65, 70, 75, etc.) with the nearest US inch band such as 30, 32, 34.

Why do the cup letters change?

US sizing introduces double letters like DD and DDD/F. Use the table to line up each Japanese cup with the US equivalent.

Should I try different sister sizes?

Yes. Adjust the band up or down if you prefer a different tension, compensating with the matching cup to keep volume consistent.

Where can I find US-sized bras after converting?

Retailers including Bare Necessities, Nordstrom, and Amazon US carry wide cup ranges that align with Japanese conversions.