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Ring Size Conversion Chart
International Ring Sizes
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) | USA & Canada | British, Irish, Australian & New Zealand | 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 1/2 | ||
| 0.49 | 12.4 | 1.539 | 39.1 | 1 | B | |
| 0.498 | 12.6 | 1.564 | 39.7 | 1 1/4 | B 1/2 | |
| 0.506 | 12.9 | 1.589 | 40.4 | 1 1/2 | C | |
| 0.514 | 13.1 | 1.614 | 41 | 1 3/4 | C 1/2 | |
| 0.522 | 13.3 | 1.639 | 41.6 | 2 | D | 1.5 |
| 0.53 | 13.5 | 1.664 | 42.3 | 2 1/4 | D 1/2 | |
| 0.538 | 13.7 | 1.689 | 42.9 | 2 1/2 | E | 2.75 |
| 0.546 | 13.9 | 1.714 | 43.5 | 2 3/4 | E 1/2 | |
| 0.554 | 14.1 | 1.74 | 44.2 | 3 | F | 4 |
| 0.562 | 14.3 | 1.765 | 44.8 | 3 1/4 | F 1/2 | 5.25 |
| 0.57 | 14.5 | 1.79 | 45.5 | 3 1/2 | G | |
| 0.578 | 14.7 | 1.815 | 46.1 | 3 3/4 | G 1/2 | 6.5 |
| 0.586 | 14.9 | 1.84 | 46.7 | 4 | H | |
| 0.594 | 15.1 | 1.865 | 47.4 | 4 1/4 | H 1/2 | 7.75 |
| 0.602 | 15.3 | 1.89 | 48 | 4 1/2 | I | |
| 0.61 | 15.5 | 1.915 | 48.7 | 4 3/4 | J | 9 |
| 0.618 | 15.7 | 1.941 | 49.3 | 5 | J 1/2 | |
| 0.626 | 15.9 | 1.966 | 49.9 | 5 1/4 | K | 10 |
| 0.634 | 16.1 | 1.991 | 50.6 | 5 1/2 | K 1/2 | |
| 0.642 | 16.3 | 2.016 | 51.2 | 5 3/4 | L | 11.75 |
| 0.65 | 16.5 | 2.041 | 51.8 | 6 | L 1/2 | 12.75 |
| 0.658 | 16.7 | 2.066 | 52.5 | 6 1/4 | M | 12.75 |
| 0.666 | 16.9 | 2.091 | 53.1 | 6 1/2 | M 1/2 | 14 |
| 0.674 | 17.1 | 2.116 | 53.8 | 6 3/4 | N | |
| 0.682 | 17.3 | 2.141 | 54.4 | 7 | N 1/2 | 15.25 |
| 0.69 | 17.5 | 2.167 | 55 | 7 1/4 | O | |
| 0.698 | 17.7 | 2.192 | 55.7 | 7 1/2 | O 1/2 | 16.5 |
| 0.706 | 17.9 | 2.217 | 56.3 | 7 3/4 | P | |
| 0.714 | 18.1 | 2.242 | 56.9 | 8 | P 1/2 | 17.75 |
| 0.722 | 18.3 | 2.267 | 57.6 | 8 1/4 | Q | |
| 0.73 | 18.5 | 2.292 | 58.2 | 8 1/2 | Q 1/2 | |
| 0.738 | 18.7 | 2.317 | 58.9 | 8 3/4 | R | 19 |
| 0.746 | 18.9 | 2.342 | 59.5 | 9 | R 1/2 | |
| 0.754 | 19.2 | 2.368 | 60.1 | 9 1/4 | S | 20.25 |
| 0.762 | 19.4 | 2.393 | 60.8 | 9 1/2 | S 1/2 | |
| 0.77 | 19.6 | 2.418 | 61.4 | 9 3/4 | T | 21.5 |
| 0.778 | 19.8 | 2.443 | 62.1 | 10 | T 1/2 | |
| 0.786 | 20 | 2.468 | 62.7 | 10 1/4 | U | |
| 0.794 | 20.2 | 2.493 | 63.3 | 10 1/2 | U 1/2 | 22.75 |
| 0.802 | 20.4 | 2.518 | 64 | 10.3/4 | V | |
| 0.81 | 20.6 | 2.543 | 64.6 | 11 | V 1/2 | |
| 0.818 | 20.8 | 2.569 | 65.2 | 11 1/4 | W | 25 |
| 0.826 | 21 | 2.594 | 65.9 | 11 1/2 | W 1/2 | |
| 0.834 | 21.2 | 2.619 | 66.5 | 11 3/4 | X | |
| 0.842 | 21.4 | 2.644 | 67.2 | 12 | X 1/2 | 27.5 |
| 0.85 | 21.6 | 2.669 | 67.8 | 12 1/4 | Y | |
| 0.858 | 21.8 | 2.694 | 68.4 | 12 1/2 | Z | 28.75 |
| 0.866 | 22 | 2.719 | 69.1 | 12 3/4 | Z 1/2 | |
| 0.874 | 22.2 | 2.744 | 69.7 | 13 | ||
| 0.882 | 22.4 | 2.769 | 70.3 | 13 1/4 | Z1 | |
| 0.89 | 22.6 | 2.795 | 71 | 13 1/2 | ||
| 0.898 | 22.8 | 2.82 | 71.6 | 13 3/4 | Z2 | |
| 0.906 | 23 | 2.845 | 72.3 | 14 | Z3 | |
| 0.914 | 23.2 | 2.87 | 72.9 | 14 1/4 | ||
| 0.922 | 23.4 | 2.895 | 73.5 | 14 1/2 | Z4 | |
| 0.93 | 23.6 | 2.92 | 74.2 | 14 3/4 | ||
| 0.938 | 23.8 | 2.945 | 74.8 | 15 | ||
| 0.946 | 24 | 2.97 | 75.4 | 15 1/4 | ||
| 0.954 | 24.2 | 2.996 | 76.1 | 15 1/2 | ||
| 0.962 | 24.4 | 3.021 | 76.7 | 15 3/4 | ||
| 0.97 | 24.6 | 3.046 | 77.4 | 16 |
Disclaimer: We provide this chart to help our international customers to find their US equivalent ring size. Although we know from experience that this chart provides very accurate conversion results, we take no responsibility for any calculation errors.
