{"id":23525,"date":"2026-05-08T17:20:29","date_gmt":"2026-05-08T08:20:29","guid":{"rendered":"https:\/\/fujimori.tokyo\/?p=23525"},"modified":"2026-05-16T14:18:39","modified_gmt":"2026-05-16T05:18:39","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91%e6%8c%87%e8%bc%aa%e3%82%b5%e3%82%a4%e3%82%ba%e6%af%94%e8%bc%83%e8%a1%a8%ef%bd%9c%e6%b5%b7%e5%a4%96%e3%82%b5%e3%82%a4%e3%82%ba%e3%82%92%e6%97%a5%e6%9c%ac","status":"publish","type":"post","link":"https:\/\/fujimori.tokyo\/en\/blog\/23525\/","title":{"rendered":"Complete Ring Size Conversion Guide | Compare International Ring Sizes to Japanese Sizes + Tips for Accurate Measuring"},"content":{"rendered":"

Ring size systems vary around the world, which can make shopping for international jewelry brands or imported rings a little confusing. If you\u2019ve ever wondered, \u201cWhat would my ring size be in another country?\u201d you\u2019re not alone.<\/p>\n\n\n\n

Before choosing a ring, it\u2019s helpful to understand how sizing differs between countries. Let\u2019s start by looking at an international ring size conversion chart featuring the most commonly used sizing systems worldwide.<\/p>\n\n\n\n

1. International Ring Size Conversion Chart (JP \/ US \/ UK \/ EU)<\/h3>\n\n\n\n
Japan (JP)<\/th>United States (US)<\/th>United Kingdom (UK)<\/th>Europe (EU)<\/th><\/tr><\/thead>
1<\/td>1<\/td>C<\/td>41<\/td><\/tr>
1.5<\/td>1.5<\/td>C+<\/td>41.5<\/td><\/tr>
2<\/td>2<\/td>D<\/td>42<\/td><\/tr>
2.5<\/td>2.25<\/td>D+<\/td>42.5<\/td><\/tr>
3<\/td>2.5<\/td>E<\/td>43<\/td><\/tr>
3.5<\/td>2.75<\/td>E+<\/td>43.5<\/td><\/tr>
4<\/td>3<\/td>F<\/td>44<\/td><\/tr>
4.5<\/td>3.25<\/td>F+<\/td>44.5<\/td><\/tr>
5<\/td>3.5<\/td>G<\/td>45<\/td><\/tr>
5.5<\/td>3.75<\/td>G+<\/td>45.5<\/td><\/tr>
6<\/td>4<\/td>G+<\/td>46<\/td><\/tr>
6.5<\/td>4.25<\/td>H<\/td>46.5<\/td><\/tr>
7<\/td>4.5<\/td>H+<\/td>47<\/td><\/tr>
7.5<\/td>4.6<\/td>I<\/td>47.5<\/td><\/tr>
8<\/td>4.7<\/td>I+<\/td>48<\/td><\/tr>
8.5<\/td>4.8<\/td>I++<\/td>48.5<\/td><\/tr>
9<\/td>5<\/td>J<\/td>49<\/td><\/tr>
9.5<\/td>5.25<\/td>J+<\/td>49.5<\/td><\/tr>
10<\/td>5.5<\/td>K<\/td>50<\/td><\/tr>
10.5<\/td>5.75<\/td>K+<\/td>50.5<\/td><\/tr>
11<\/td>6<\/td>L<\/td>51<\/td><\/tr>
11.5<\/td>6.25<\/td>L+<\/td>51.5<\/td><\/tr>
12<\/td>6.5<\/td>L++<\/td>52<\/td><\/tr>
12.5<\/td>6.6<\/td>M<\/td>52.5<\/td><\/tr>
13<\/td>6.7<\/td>M+<\/td>53<\/td><\/tr>
13.5<\/td>6.9<\/td>N<\/td>53.5<\/td><\/tr>
14<\/td>7<\/td>N+<\/td>54<\/td><\/tr>
14.5<\/td>7.25<\/td>O<\/td>54.5<\/td><\/tr>
15<\/td>7.5<\/td>O+<\/td>55<\/td><\/tr>
15.5<\/td>7.75<\/td>O++<\/td>55.5<\/td><\/tr>
16<\/td>8<\/td>P<\/td>56<\/td><\/tr>
16.5<\/td>8.25<\/td>P+<\/td>56.5<\/td><\/tr>
17<\/td>8.5<\/td>Q<\/td>57<\/td><\/tr>
17.5<\/td>8.75<\/td>Q+<\/td>57.5<\/td><\/tr>
18<\/td>9<\/td>R<\/td>58<\/td><\/tr>
18.5<\/td>9.25<\/td>R+<\/td>58.5<\/td><\/tr>
19<\/td>9.5<\/td>S<\/td>59<\/td><\/tr>
19.5<\/td>9.75<\/td>S+<\/td>59.5<\/td><\/tr>
20<\/td>10<\/td>T<\/td>60<\/td><\/tr>
20.5<\/td>10.1<\/td>T+<\/td>60.5<\/td><\/tr>
21<\/td>10.2<\/td>T++<\/td>61<\/td><\/tr>
21.5<\/td>10.3<\/td>T+++<\/td>61.5<\/td><\/tr>
22<\/td>10.5<\/td>U<\/td>62<\/td><\/tr>
22.5<\/td>10.75<\/td>U+<\/td>62.5<\/td><\/tr>
23<\/td>11<\/td>V<\/td>63<\/td><\/tr>
23.5<\/td>10.25<\/td>V+<\/td>63.5<\/td><\/tr>
24<\/td>11.5<\/td>W<\/td>64<\/td><\/tr>
24.5<\/td>11.75<\/td>W+<\/td>64.5<\/td><\/tr>
25<\/td>12<\/td>X<\/td>65<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n

*Please note that ring sizes may vary slightly depending on the jewelry brand, ring width, and design, so this international ring size chart should be used as a general sizing guide.<\/p>\n<\/blockquote>\n\n\n\n

\n\n\n\n

2. How to Measure Your Ring Size Accurately: Tips to Avoid Common Mistakes<\/h3>\n\n\n\n

While there are many online methods that use string or paper to measure ring size at home, these techniques can easily lead to inaccurate results due to finger shape, measuring pressure, and sizing errors.<\/p>\n\n\n\n

For the most accurate ring size measurement, we recommend visiting a nearby jewelry store and using a professional ring sizer (ring gauge).<\/strong> <\/p>\n\n\n\n

\"\u30ea\u30f3\u30b0\u30b5\u30a4\u30ba\u8a08\u6e2c\"
At Fujimori Tokyo, we offer both standard-width and wide-band ring designs, as the fit may vary depending on the ring width.<\/figcaption><\/figure>\n\n\n\n

When choosing your ring size, keep the following points in mind for a more comfortable and accurate fit:<\/p>\n\n\n\n

\u2460 Consider the Ring Design and Width<\/h4>\n\n\n\n

The wider the ring band, the more surface area it covers on your finger, which can make the fit feel tighter.<\/p>\n\n\n\n