直径（mm）からEU（mm周囲長）への変換
直径（mm）をEU（mm周囲長）に瞬時に変換
EU（mm周囲長）
変換式
1 mm = 1 EUここで:
- mm = 直径（mm）
- EU = EU（mm周囲長）
直径（mm）について
直径（mm）（mm）は、metric計量システムにおける指輪のサイズの単位です。
EU（mm周囲長）について
eu（mm周囲長）（EU）は、metric計量システムにおける指輪のサイズの単位です。
直径（mm）をEU（mm周囲長）に変換する方法
直径（mm）をeu（mm周囲長）に瞬時に変換
クイックリファレンス:
- 1 mm = 1.000000 EU
- 1 EU = 1.000000 mm
よくある直径（mm）からEU（mm周囲長）への変換
= 11.50 EU
= 21.50 EU
= 34.00 EU
= 76.69 EU
= 123.56 EU
= 217.31 EU
変換参照表
| 直径（mm） (mm) | EU（mm周囲長） (EU) |
|---|---|
| 1 | 11.5 |
| 2 | 14 |
| 3 | 16.5 |
| 4 | 19 |
| 5 | 21.5 |
| 10 | 34 |
| 15 | 47 |
| 20 | 64 |
| 25 | 76.6875 |
| 50 | 123.5625 |
| 75 | 170.4375 |
| 100 | 217.3125 |
| 250 | 498.5625 |
| 500 | 967.3125 |
| 1,000 | 1,904.8125 |
直径（mm）からeu（mm周囲長）への一般的な変換を示すクイックリファレンステーブル。
実際の指輪のサイズ変換例
Engagement Rings
When shopping for engagement rings from international jewelers, converting ring sizes ensures the perfect fit for your special moment.
Online Jewelry Shopping
International jewelry websites may use different sizing systems. Converting your size helps you order confidently from anywhere in the world.
Antique and Vintage Rings
Vintage rings often use older sizing systems. Understanding size conversions helps collectors and buyers find pieces that fit.
Gift Purchasing
Buying rings as gifts requires knowing the recipient's size in the correct system for the jeweler you're purchasing from.
Resizing Decisions
When determining if a ring needs resizing, knowing exact measurements helps jewelers understand how much adjustment is needed.
Travel Jewelry Shopping
Shopping for jewelry while traveling abroad is easier when you know your ring size in the local sizing system.