Shopping for bras in Japan but only know your US size? You’re not alone. Bra sizing can be confusing because every country has its own system, and what fits perfectly in the US may not match the label in Japan.
The good news is, once you understand the simple conversion rules, you can easily find your perfect fit. This guide explains US to Japan bra size conversion with easy-to-read charts, real examples, and helpful tips. I also made a bra size calculator tool that can help you find out the correct size for you
How Bra Sizing Works in the US vs Japan
Before diving into charts, it’s important to know how the two systems differ:
- Band Sizes
- In the US: band sizes are based on inches (30, 32, 34, etc.).
- In Japan: band sizes are based on centimeters (65, 70, 75, etc.).
- Rule: Add +15 to your US band to find your Japan band.
- Cup Sizes
- US and Japan both use A, B, C, D, etc.
- But in Japan, the cup is usually one size smaller.
- Rule: Drop one letter when converting from US to Japan. (A stays A.)
US to Japan Bra Band Size Conversion
| US Band | Japan Band |
|---|---|
| 30 | 65 |
| 32 | 70 |
| 34 | 75 |
| 36 | 80 |
| 38 | 85 |
| 40 | 90 |
US to Japan Bra Cup Size Conversion
| US Cup | Japan Cup |
|---|---|
| A | A |
| B | A |
| C | B |
| D | C |
| DD/E | D |
| DDD/F | E |
| G | F |
Complete US to Japan Bra Size Conversion Chart
Here’s the full conversion chart that combines both bands and cups for easier reference:
| US Size | Japan Size |
|---|---|
| 30A | 65A |
| 30B | 65A |
| 30C | 65B |
| 30D | 65C |
| 30DD/E | 65D |
| 30DDD/F | 65E |
| 30G | 65F |
| 32A | 70A |
| 32B | 70A |
| 32C | 70B |
| 32D | 70C |
| 32DD/E | 70D |
| 32DDD/F | 70E |
| 32G | 70F |
| 34A | 75A |
| 34B | 75A |
| 34C | 75B |
| 34D | 75C |
| 34DD/E | 75D |
| 34DDD/F | 75E |
| 34G | 75F |
| 36A | 80A |
| 36B | 80A |
| 36C | 80B |
| 36D | 80C |
| 36DD/E | 80D |
| 36DDD/F | 80E |
| 36G | 80F |
| 38A | 85A |
| 38B | 85A |
| 38C | 85B |
| 38D | 85C |
| 38DD/E | 85D |
| 38DDD/F | 85E |
| 38G | 85F |
| 40A | 90A |
| 40B | 90A |
| 40C | 90B |
| 40D | 90C |
| 40DD/E | 90D |
| 40DDD/F | 90E |
| 40G | 90F |
Example Conversions
Still unsure? Here are a few practical examples:
- US 34C = Japan 75B
- US 36D = Japan 80C
- US 32DD/E = Japan 70D
- US 38B = Japan 85A
Tips for Finding the Right Fit in Japan
- Japanese bras often have different designs and coverage styles, sometimes with extra padding.
- If you’re between sizes, try on both—brands can vary slightly.
- Larger cup sizes (above F) may be harder to find in local shops but are often available from international brands or specialty stores.
FAQ – US to Japan Bra Size Conversion
Q1: Is Japanese bra sizing smaller than US sizing? Yes. Japanese cup sizes run about one size smaller than US sizes, and band sizes are measured differently (in centimeters).
Q2: How do I convert a US 34D to Japan? US 34D ≈ Japan 75C.
Q3: What is a US 36C in Japan? US 36C ≈ Japan 80B.
Q4: Do Japanese stores sell larger bra sizes? Most Japanese stores carry up to F or G cups, but larger sizes may require shopping online or at international lingerie brands.
Final Thoughts on Bra Size Conversion (US → Japan)
Finding your bra size in Japan doesn’t have to be difficult. Just remember the two simple rules: add +15 to your band size and go down one cup size. With the conversion chart above, you can confidently shop in Japan and know exactly what size to try on. Bookmark this guide for easy reference next time you travel or shop online!
