All 25karats rings are manufactured in US standard ring size. Ring sizes vary by country. If you already know your ring size and just need to convert it to another scale, see our international ring size conversion chart below.
|
Inside Diameter
Inches
|
Inside Diameter
mm
|
Inside Circumference
Inches
|
Inside Circumference
mm
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🇺🇸 🇨🇦
USA & Canada
|
🇬🇧 🇮🇪 🇦🇺 🇳🇿
UK & Commonwealth
|
🇪🇺
European
|
|---|---|---|---|---|---|---|
| 0.458 | 11.6 | 1.438 | 36.5 | — | — | — |
| 0.466 | 11.8 | 1.463 | 37.2 | — | — | — |
| 0.474 | 12 | 1.488 | 37.8 | — | A | — |
| 0.482 | 12.2 | 1.513 | 38.4 | — | A ½ | — |
| 0.49 | 12.4 | 1.539 | 39.1 | 1 | B | — |
| 0.498 | 12.6 | 1.564 | 39.7 | 1¼ | B½ | — |
| 0.506 | 12.9 | 1.589 | 40.4 | 1½ | C | — |
| 0.514 | 13.1 | 1.614 | 41 | 1¾ | C½ | — |
| 0.522 | 13.3 | 1.639 | 41.6 | 2 | D | 1.5 |
| 0.53 | 13.5 | 1.664 | 42.3 | 2¼ | D½ | — |
| 0.538 | 13.7 | 1.689 | 42.9 | 2½ | E | 2.75 |
| 0.546 | 13.9 | 1.714 | 43.5 | 2¾ | E½ | — |
| 0.554 | 14.1 | 1.74 | 44.2 | 3 | F | 4 |
| 0.562 | 14.3 | 1.765 | 44.8 | 3¼ | F½ | 5.25 |
| 0.57 | 14.5 | 1.79 | 45.5 | 3½ | G | — |
| 0.578 | 14.7 | 1.815 | 46.1 | 3¾ | G½ | 6.5 |
| 0.586 | 14.9 | 1.84 | 46.7 | 4 | H | — |
| 0.594 | 15.1 | 1.865 | 47.4 | 4¼ | H½ | 7.75 |
| 0.602 | 15.3 | 1.89 | 48 | 4½ | I | — |
| 0.61 | 15.5 | 1.915 | 48.7 | 4¾ | J | 9 |
| 0.618 | 15.7 | 1.941 | 49.3 | 5 | J½ | — |
| 0.626 | 15.9 | 1.966 | 49.9 | 5¼ | K | 10 |
| 0.634 | 16.1 | 1.991 | 50.6 | 5½ | K½ | — |
| 0.642 | 16.3 | 2.016 | 51.2 | 5¾ | L | 11.75 |
| 0.65 | 16.5 | 2.041 | 51.8 | 6 | L½ | 12.75 |
| 0.658 | 16.7 | 2.066 | 52.5 | 6¼ | M | 12.75 |
| 0.666 | 16.9 | 2.091 | 53.1 | 6½ | M½ | 14 |
| 0.674 | 17.1 | 2.116 | 53.8 | 6¾ | N | — |
| 0.682 | 17.3 | 2.141 | 54.4 | 7 | N½ | 15.25 |
| 0.69 | 17.5 | 2.167 | 55 | 7¼ | O | — |
| 0.698 | 17.7 | 2.192 | 55.7 | 7½ | O½ | 16.5 |
| 0.706 | 17.9 | 2.217 | 56.3 | 7¾ | P | — |
| 0.714 | 18.1 | 2.242 | 56.9 | 8 | P½ | 17.75 |
| 0.722 | 18.3 | 2.267 | 57.6 | 8¼ | Q | — |
| 0.73 | 18.5 | 2.292 | 58.2 | 8½ | Q½ | — |
| 0.738 | 18.7 | 2.317 | 58.9 | 8¾ | R | 19 |
| 0.746 | 18.9 | 2.342 | 59.5 | 9 | R½ | — |
| 0.754 | 19.2 | 2.368 | 60.1 | 9¼ | S | 20.25 |
| 0.762 | 19.4 | 2.393 | 60.8 | 9½ | S½ | — |
| 0.77 | 19.6 | 2.418 | 61.4 | 9¾ | T | 21.5 |
| 0.778 | 19.8 | 2.443 | 62.1 | 10 | T½ | — |
| 0.786 | 20 | 2.468 | 62.7 | 10¼ | U | — |
| 0.794 | 20.2 | 2.493 | 63.3 | 10½ | U½ | 22.75 |
| 0.802 | 20.4 | 2.518 | 64 | 10¾ | V | — |
| 0.81 | 20.6 | 2.543 | 64.6 | 11 | V½ | — |
| 0.818 | 20.8 | 2.569 | 65.2 | 11¼ | W | 25 |
| 0.826 | 21 | 2.594 | 65.9 | 11½ | W½ | — |
| 0.834 | 21.2 | 2.619 | 66.5 | 11¾ | X | — |
| 0.842 | 21.4 | 2.644 | 67.2 | 12 | X½ | 27.5 |
| 0.85 | 21.6 | 2.669 | 67.8 | 12¼ | Y | — |
| 0.858 | 21.8 | 2.694 | 68.4 | 12½ | Z | 28.75 |
| 0.866 | 22 | 2.719 | 69.1 | 12¾ | Z½ | — |
| 0.874 | 22.2 | 2.744 | 69.7 | 13 | Z1 | — |
| 0.882 | 22.4 | 2.769 | 70.3 | 13¼ | Z1 | — |
| 0.89 | 22.6 | 2.795 | 71 | 13½ | — | — |
| 0.898 | 22.8 | 2.82 | 71.6 | 13¾ | Z2 | — |
| 0.906 | 23 | 2.845 | 72.3 | 14 | Z3 | — |
| 0.914 | 23.2 | 2.87 | 72.9 | 14¼ | — | — |
| 0.922 | 23.4 | 2.895 | 73.5 | 14½ | Z4 | — |
| 0.93 | 23.6 | 2.92 | 74.2 | 14¾ | — | — |
| 0.938 | 23.8 | 2.945 | 74.8 | 15 | — | — |
| 0.946 | 24 | 2.97 | 75.4 | 15¼ | — | — |
| 0.954 | 24.2 | 2.996 | 76.1 | 15½ | — | — |
| 0.962 | 24.4 | 3.021 | 76.7 | 15¾ | — | — |
| 0.97 | 24.6 | 3.046 | 77.4 | 16 | — | — |
We are happy to mail you a complimentary plastic ring size to help you measure your finger size from the comfort of your home. (USA & Canada addresses only)
Get Your Free Ring SizerAt 25karats, we offer free 60-day resizing and exchanges to ensure a perfect fit. Most designs can be resized up to one size bigger or smaller or exchanged for a new size within 60 days at no cost.
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