Ring Sizing Chart
This table shows the ring size conversions for different countries and the internal diameters
correspond to those sizes.
Please e-mail us at
CustomerService@PrincessJewelry.com if you have any questions.
| Size |
Diameter (in) |
Diameter (mm) |
British |
French |
German |
Japanese |
Swiss |
| 0 | 0.458 | 11.63 | -- | 36.5 | 11.63 | -- | -- |
| 0.25 | 0.466 | 11.84 | -- | 37.2 | 11.84 | -- | -- |
| 0.5 | 0.474 | 12.04 | A | 37.8 | 12.04 | -- | -- |
| 0.75 | 0.482 | 12.24 | A 1/2 | 38.5 | 12.24 | -- | -- |
| 1 | 0.49 | 12.45 | B | 39.1 | 12.45 | 1 | -- |
| 1.25 | 0.498 | 12.65 | B 1/2 | 39.7 | 12.65 | -- | -- |
| 1.5 | 0.506 | 12.85 | C | 40.4 | 12.85 | -- | 0.5 |
| 1.75 | 0.514 | 13.06 | C 1/2 | 41 | 13.06 | -- | 1 |
| 2 | 0.522 | 13.26 | D | 41.7 | 13.26 | 2 | 1.75 |
| 2.25 | 0.53 | 13.46 | D 1/2 | 42.3 | 13.46 | -- | 2.25 |
| 2.5 | 0.538 | 13.67 | E | 42.9 | 13.67 | 3 | 3 |
| 2.75 | 0.546 | 13.87 | E 1/2 | 43.6 | 13.87 | -- | 3.5 |
| 3 | 0.554 | 14.07 | F | 44.2 | 14.07 | 4 | 4.25 |
| 3.25 | 0.562 | 14.27 | F 1/2 | 44.8 | 14.27 | 5 | 4.75 |
| 3.5 | 0.57 | 14.48 | G | 45.5 | 14.48 | -- | 5.5 |
| 3.75 | 0.578 | 14.68 | G 1/2 | 46.1 | 14.68 | 6 | 6 |
| 4 | 0.586 | 14.88 | H | 46.8 | 14.88 | 7 | 6.75 |
| 4.25 | 0.594 | 15.09 | H 1/2 | 47.4 | 15.09 | -- | 7.5 |
| 4.5 | 0.602 | 15.29 | I | 48 | 15.29 | 8 | 8 |
| 4.75 | 0.61 | 15.49 | J | 48.7 | 15.49 | -- | 8.75 |
| 5 | 0.618 | 15.7 | J 1/2 | 49.3 | 15.7 | 9 | 9.25 |
| 5.25 | 0.626 | 15.9 | K | 50 | 15.9 | -- | 10 |
| 5.5 | 0.634 | 16.1 | K 1/2 | 50.6 | 16.1 | 10 | 10.5 |
| 5.75 | 0.642 | 16.31 | L | 51.2 | 16.31 | -- | 11.25 |
| 6 | 0.65 | 16.51 | L 1/2 | 51.9 | 16.51 | 11 | 11.75 |
| 6.25 | 0.658 | 16.71 | M | 52.5 | 16.71 | 12 | 12.5 |
| 6.5 | 0.666 | 16.92 | M 1/2 | 53.1 | 16.92 | 13 | 13.25 |
| 6.75 | 0.674 | 17.12 | N | 53.8 | 17.12 | -- | 13.75 |
| 7 | 0.682 | 17.32 | N 1/2 | 54.4 | 17.32 | 14 | 14.5 |
| 7.25 | 0.69 | 17.53 | O | 55.1 | 17.53 | -- | 15 |
| 7.5 | 0.698 | 17.73 | O 1/2 | 55.7 | 17.73 | 15 | 15.75 |
| 7.75 | 0.706 | 17.93 | P | 56.3 | 17.93 | -- | 16.25 |
| 8 | 0.714 | 18.14 | P 1/2 | 57 | 18.14 | 16 | 17 |
| 8.25 | 0.722 | 18.34 | Q | 57.6 | 18.34 | -- | 17.5 |
| 8.5 | 0.73 | 18.54 | Q 1/2 | 58.3 | 18.54 | 17 | 18.25 |
| 8.75 | 0.738 | 18.75 | R | 58.9 | 18.75 | -- | 19 |
| 9 | 0.746 | 18.95 | R 1/2 | 59.5 | 18.95 | 18 | 19.5 |
| 9.25 | 0.754 | 19.15 | S | 60.2 | 19.15 | -- | 20.25 |
| 9.5 | 0.762 | 19.35 | S 1/2 | 60.8 | 19.35 | 19 | 20.75 |
| 9.75 | 0.77 | 19.56 | T | 61.4 | 19.56 | -- | 21.5 |
| 10 | 0.778 | 19.76 | T 1/2 | 62.1 | 19.76 | 20 | 22 |
| 10.25 | 0.786 | 19.96 | U | 62.7 | 19.96 | 21 | 22.75 |
| 10.5 | 0.794 | 20.17 | U 1/2 | 63.4 | 20.17 | 22 | 23.25 |
| 10.75 | 0.802 | 20.37 | V | 64 | 20.37 | -- | 24 |
| 11 | 0.81 | 20.57 | V 1/2 | 64.6 | 20.57 | 23 | 24.75 |
| 11.25 | 0.818 | 20.78 | W | 65.3 | 20.78 | -- | 25.25 |
| 11.5 | 0.826 | 20.98 | W 1/2 | 65.9 | 20.98 | 24 | 26 |
| 11.75 | 0.834 | 21.18 | X | 66.6 | 21.18 | -- | 26.5 |
| 12 | 0.842 | 21.39 | X 1/2 | 67.2 | 21.39 | 25 | 27.25 |
| 12.25 | 0.85 | 21.59 | Y | 67.8 | 21.59 | -- | 27.75 |
| 12.5 | 0.858 | 21.79 | Z | 68.5 | 21.79 | 26 | 28.5 |
| 12.75 | 0.866 | 22 | Z 1/2 | 69.1 | 22 | -- | 29 |
| 13 | 0.874 | 22.2 | -- | 69.7 | 22.2 | 27 | 29.75 |
| 13.25 | 0.8825 | 22.4 | Z1 | 70.4 | 22.4 | -- | 30.5 |
| 13.5 | 0.89 | 22.61 | -- | 71 | 22.61 | -- | 31 |
| 13.75 | 0.898 | 22.81 | Z2 | 71.7 | 22.81 | -- | 31.75 |
| 14 | 0.906 | 23.01 | Z3 | 72.3 | 23.01 | -- | 32.25 |
| 14.25 | 0.914 | 23.22 | -- | 72.9 | 23.22 | -- | 33 |
| 14.5 | 0.922 | 23.42 | Z4 | 73.6 | 23.42 | -- | 33.5 |
| 14.75 | 0.93 | 23.62 | -- | 74.2 | 23.62 | -- | 34.25 |
| 15 | 0.938 | 23.83 | -- | 74.8 | 23.83 | -- | 34.75 |
| 15.25 | 0.946 | 24.03 | -- | 75.5 | 24.03 | -- | 35.5 |
| 15.5 | 0.954 | 24.23 | -- | 76.1 | 24.23 | -- | 36.25 |