Ring Size Chart
One table converting ring sizes between the US, UK, European and Asian systems, with the matching diameter and circumference in both inches and millimeters.
Ring size chart
We have gathered all the ring sizes for you, according to the different countries of the world. If you are unsure how to read it, or how to measure at home, this ring size guide (opens in new tab) explains the systems used in each country.
Scroll the table sideways to see all regions.
| US & Canada | UK, Australia, NZ | Europe | China & Japan | Inner diameter (mm) | Inner circumference (mm) | Inner diameter (in) | Inner circumference (in) |
|---|---|---|---|---|---|---|---|
| · | A | · | · | 12 | 37.8 | 0.474 | 1.488 |
| · | A 1/2 | · | · | 12.2 | 38.4 | 0.482 | 1.513 |
| 1 | B | · | 1 | 12.4 | 39.1 | 0.49 | 1.539 |
| 1 1/4 | B 1/2 | · | · | 12.6 | 39.7 | 0.498 | 1.564 |
| 1 1/2 | C | · | · | 12.9 | 40.4 | 0.506 | 1.589 |
| 1 3/4 | C 1/2 | · | · | 13.1 | 41 | 0.514 | 1.614 |
| 2 | D | 1.5 | 2 | 13.3 | 41.6 | 0.522 | 1.639 |
| 2 1/4 | D 1/2 | · | · | 13.5 | 42.3 | 0.53 | 1.664 |
| 2 1/2 | E | 2.75 | 3 | 13.7 | 42.9 | 0.538 | 1.689 |
| 2 3/4 | E 1/2 | · | · | 13.9 | 43.5 | 0.546 | 1.714 |
| 3 | F | 4 | 4 | 14.1 | 44.2 | 0.554 | 1.74 |
| 3 1/4 | F 1/2 | 5.25 | 5 | 14.3 | 44.8 | 0.562 | 1.765 |
| 3 1/2 | G | · | · | 14.5 | 45.5 | 0.57 | 1.79 |
| 3 3/4 | G 1/2 | 6.5 | 6 | 14.7 | 46.1 | 0.578 | 1.815 |
| 4 | H | · | 7 | 14.9 | 46.7 | 0.586 | 1.84 |
| 4 1/4 | H 1/2 | 7.75 | · | 15.1 | 47.4 | 0.594 | 1.865 |
| 4 1/2 | I | · | 8 | 15.3 | 48 | 0.602 | 1.89 |
| 4 3/4 | J | 9 | · | 15.5 | 48.7 | 0.61 | 1.915 |
| 5 | J 1/2 | · | 9 | 15.7 | 49.3 | 0.618 | 1.941 |
| 5 1/4 | K | 10 | · | 15.9 | 49.9 | 0.626 | 1.966 |
| 5 1/2 | K 1/2 | · | 10 | 16.1 | 50.6 | 0.634 | 1.991 |
| 5 3/4 | L | 11.75 | · | 16.3 | 51.2 | 0.642 | 2.016 |
| 6 | L 1/2 | 12.75 | 11 | 16.5 | 51.8 | 0.65 | 2.041 |
| 6 1/4 | M | 12.75 | 12 | 16.7 | 52.5 | 0.658 | 2.066 |
| 6 1/2 | M 1/2 | 14 | 13 | 16.9 | 53.1 | 0.666 | 2.091 |
| 6 3/4 | N | · | · | 17.1 | 53.8 | 0.674 | 2.116 |
| 7 | N 1/2 | 15.25 | 14 | 17.3 | 54.4 | 0.682 | 2.141 |
| 7 1/4 | O | · | · | 17.5 | 55 | 0.69 | 2.167 |
| 7 1/2 | O 1/2 | 16.5 | 15 | 17.7 | 55.7 | 0.698 | 2.192 |
| 7 3/4 | P | · | · | 17.9 | 56.3 | 0.706 | 2.217 |
| 8 | P 1/2 | 17.75 | 16 | 18.1 | 56.9 | 0.714 | 2.242 |
| 8 1/4 | Q | · | · | 18.3 | 57.6 | 0.722 | 2.267 |
| 8 1/2 | Q 1/2 | · | 17 | 18.5 | 58.2 | 0.73 | 2.292 |
| 8 3/4 | R | 19 | · | 18.7 | 58.9 | 0.738 | 2.317 |
| 9 | R 1/2 | · | 18 | 18.9 | 59.5 | 0.746 | 2.342 |
| 9 1/4 | S | 20.25 | · | 19.2 | 60.1 | 0.754 | 2.368 |
| 9 1/2 | S 1/2 | · | 19 | 19.4 | 60.8 | 0.762 | 2.393 |
| 9 3/4 | T | 21.5 | · | 19.6 | 61.4 | 0.77 | 2.418 |
| 10 | T 1/2 | · | 20 | 19.8 | 62.1 | 0.778 | 2.443 |
| 10 1/4 | U | · | 21 | 20 | 62.7 | 0.786 | 2.468 |
| 10 1/2 | U 1/2 | 22.75 | 22 | 20.2 | 63.3 | 0.794 | 2.493 |
| 10 3/4 | V | · | · | 20.4 | 64 | 0.802 | 2.518 |
| 11 | V 1/2 | · | 23 | 20.6 | 64.6 | 0.81 | 2.543 |
| 11 1/4 | W | 25 | · | 20.8 | 65.2 | 0.818 | 2.569 |
| 11 1/2 | W 1/2 | · | 24 | 21 | 65.9 | 0.826 | 2.594 |
| 11 3/4 | X | · | · | 21.2 | 66.5 | 0.834 | 2.619 |
| 12 | X 1/2 | 27.5 | 25 | 21.4 | 67.2 | 0.842 | 2.644 |
| 12 1/4 | Y | · | · | 21.6 | 67.8 | 0.85 | 2.669 |
| 12 1/2 | Z | 28.75 | 26 | 21.8 | 68.4 | 0.858 | 2.694 |
| 12 3/4 | Z 1/2 | · | · | 22 | 69.1 | 0.866 | 2.719 |
| 13 | · | · | 27 | 22.2 | 69.7 | 0.874 | 2.744 |
| 13 1/4 | Z1 | · | · | 22.4 | 70.3 | 0.882 | 2.769 |
| 13 1/2 | · | · | · | 22.6 | 71 | 0.89 | 2.795 |
| 13 3/4 | Z2 | · | · | 22.8 | 71.6 | 0.898 | 2.82 |
| 14 | Z3 | · | · | 23 | 72.3 | 0.906 | 2.845 |
| 14 1/4 | · | · | · | 23.2 | 72.9 | 0.914 | 2.87 |
| 14 1/2 | Z4 | · | · | 23.4 | 73.5 | 0.922 | 2.895 |
| 14 3/4 | · | · | · | 23.6 | 74.2 | 0.93 | 2.92 |
| 15 | · | · | · | 23.8 | 74.8 | 0.938 | 2.945 |
| 15 1/4 | · | · | · | 24 | 75.4 | 0.946 | 2.97 |
| 15 1/2 | · | · | · | 24.2 | 76.1 | 0.954 | 2.996 |
| 15 3/4 | · | · | · | 24.4 | 76.7 | 0.962 | 3.021 |
| 16 | · | · | · | 24.6 | 77.4 | 0.97 | 3.046 |