Our handy conversion chart allows you to find your ring size for diamond engagement rings and wedding rings comparing sizes in mm and inches. Using the table below you will be able to work out your approximate finger size based on the finger size diameter or circumference. Included is an international conversion feature so you can compare between the UK, Australia, Europe and the USA. If you need any assistance in working out your finger size we would be happy to help. You can get in touch with us here.
Find your ring size with our International Conversion Chart
| Ring Diameter(Inside) | Ring Circumference(Inside) | ‹ International Standard Sizes › | |||||||
| MM | Inches | MM | Inches | Britain & Australia | USA & Canada | Europe | German/Russian/Asia | India/China/Japan | Netherlands/Swiss |
| 9.9 | 0.390 | 31.1 | 1.22 | · | 0000 | · | · | · | · |
| 10.7 | 0.442 | 33.7 | 1.39 | · | 00 | · | · | · | · |
| 11.5 | 0.454 | 36.2 | 1.43 | · | 0 | · | · | · | · |
| 12.0 | 0.470 | 37.5 | 1.50 | A | 1/2 | · | · | · | · |
| 12.2 | 0.479 | 38.3 | 1.51 | A 1/2 | 3/4 | · | · | · | · |
| 12.4 | 0.487 | 38.9 | 1.53 | B | 1 | · | · | 1 | · |
| 12.6 | 0.506 | 39.6 | 1.56 | B 1/2 | 1 1/4 | · | · | · | · |
| 12.8 | 0.503 | 40.2 | 1.58 | C | 1 1/2 | · | · | · | · |
| 13.0 | 0.511 | 40.8 | 1.61 | C 1/2 | 1 3/4 | · | · | · | · |
| 13.2 | 0.520 | 41.5 | 1.63 | D | 2 | 41 1/2 | 13 1/2 | 2 | 1 1/2 |
| 13.4 | 0.528 | 42.1 | 1.66 | D 1/2 | 2 1/4 | · | · | · | · |
| 13.6 | 0.536 | 42.8 | 1.68 | E | 2 1/2 | 42 3/4 | 13 3/4 | 3 | 2 3/4 |
| 13.8 | 0.544 | 43.5 | 1.71 | E 1/2 | 2 3/4 | · | · | · | · |
| 14.0 | 0.553 | 44.1 | 1.74 | F | 3 | 44 | 14 | 4 | 4 |
| 14.2 | 0.557 | 44.5 | 1.75 | F 1/2 | 3 1/8 | · | · | · | · |
| 14.3 | 0.561 | 44.8 | 1.76 | F 3/4 | 3 1/4 | · | · | · | · |
| 14.4 | 0.565 | 45.1 | 1.77 | G | 3 3/8 | 45 1/4 | · | 5 | 5 1/4 |
| 14.5 | 0.568 | 45.4 | 1.79 | G 1/4 | 3 1/2 | · | 14 1/2 | · | · |
| 14.6 | 0.573 | 45.7 | 1.80 | G 1/2 | 3 5/8 | · | · | 6 | · |
| 14.7 | 0.576 | 46.0 | 1.81 | H | 3 3/4 | 46 1/2 | · | · | 6 1/2 |
| 14.9 | 0.585 | 46.7 | 1.84 | H 1/2 | 4 | · | 15 | 7 | · |
| 15.0 | 0.592 | 47.3 | 1.86 | I | 4 1/4 | 47 3/4 | · | · | 7 3/4 |
| 15.3 | 0.601 | 48.0 | 1.89 | I 1/2 | 4 1/2 | · | 15 1/4 | 8 | · |
| 15.4 | 0.606 | 48.4 | 1.90 | J | 4 5/8 | 50 | 15 1/2 | · | 9 |
| 15.5 | 0.611 | 48.8 | 1.92 | J 1/4 | 4 3/4 | · | · | · | · |
| 15.7 | 0.618 | 50.3 | 1.94 | J 1/2 | 5 | · | 15 3/4 | 9 | · |
| 15.8 | 0.622 | 50.6 | 1.95 | K | 5 1/8 | 50 | · | · | 10 |
| 15.9 | 0.625 | 50.0 | 1.97 | K 1/4 | 5 1/4 | · | · | · | · |
| 16.0 | 0.630 | 50.3 | 1.98 | K 1/2 | 5 3/8 | · | · | 10 | · |
| 16.1 | 0.634 | 50.6 | 1.99 | L | 5 1/2 | 51 3/4 | 16 | · | 11 3/4 |
| 16.3 | 0.642 | 51.2 | 2.02 | L 1/4 | 5 3/4 | · | · | · | · |
| 16.4 | 0.646 | 51.6 | 2.03 | L 1/2 | 5 7/8 | · | · | · | · |
| 16.5 | 0.650 | 51.9 | 2.04 | M | 6 | 52 3/4 | 16 1/2 | 12 | 12 3/4 |
| 16.7 | 0.658 | 52.5 | 2.07 | M 1/2 | 6 1/4 | · | · | · | · |
| 16.9 | 0.666 | 53.2 | 2.09 | N | 6 1/2 | 54 | 17 | 13 | 14 |
| 17.1 | 0.674 | 53.8 | 2.12 | N 1/2 | 6 3/4 | · | · | · | · |
| 17.4 | 0.683 | 54.5 | 2.15 | O | 7 | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
| 17.5 | 0.687 | 54.8 | 2.16 | O 1/2 | 7 1/4 | · | · | · | · |
| 17.8 | 0.698 | 55.8 | 2.20 | P | 7 1/2 | 56 1/2 | 17 3/4 | 15 | 16 1/2 |
| 18.0 | 0.707 | 56.5 | 2.22 | P 1/2 | 7 3/4 | · | · | · | · |
| 18.2 | 0.716 | 57.1 | 2.25 | Q | 8 | 57 3/4 | 18 | 16 | 17 3/4 |
| 18.4 | 0.722 | 57.7 | 2.27 | Q 1/2 | 8 1/4 | · | · | · | · |
| 18.5 | 0.729 | 58.2 | 2.29 | Q 3/4 | 8 1/2 | · | 18 1/2 | 17 | · |
| 18.6 | 0.733 | 58.5 | 2.30 | R | 8 5/8 | 59 | · | · | 19 |
| 18.7 | 0.736 | 58.7 | 2.31 | R 1/4 | 8 3/4 | · | · | · | · |
| 18.8 | 0.740 | 59.1 | 2.32 | R 1/2 | 8 7/8 | · | · | · | · |
| 18.9 | 0.743 | 59.3 | 2.35 | R 3/4 | 9 | · | 19 | 18 | · |
| 19.1 | 0.752 | 60.0 | 2.36 | S | 9 1/8 | 60 1/4 | · | · | 20 1/4 |
| 19.2 | 0.757 | 60.4 | 2.38 | S 1/4 | 9 1/4 | · | · | · | · |
| 19.3 | 0.760 | 60.7 | 2.39 | S 1/2 | 9 3/8 | · | · | · | · |
| 19.4 | 0.764 | 61.0 | 2.40 | S 3/4 | 9 1/2 | · | 19 1/2 | 19 | · |
| 19.5 | 0.768 | 61.3 | 2.41 | T | 9 5/8 | 61 1/2 | · | · | 21 1/2 |
| 19.6 | 0.772 | 61.6 | 2.43 | T 1/4 | 9 3/4 | · | · | · | · |
| 19.8 | 0.781 | 62.3 | 2.45 | T 1/2 | 10 | · | 20 | 20 | · |
| 20.0 | 0.780 | 62.9 | 2.48 | U | 10 1/4 | 62 3/4 | · | 21 | 22 3/4 |
| 20.2 | 0.795 | 63.5 | 2.50 | U 1/2 | 10 1/2 | · | 20 1/4 | 22 | · |
| 20.3 | 0.800 | 63.8 | 2.51 | V | 10 5/8 | 63 | · | · | 23 3/4 |
| 20.4 | 0.805 | 64.2 | 2.53 | V 1/4 | 10 3/4 | · | · | · | · |
| 20.7 | 0.814 | 65.0 | 2.56 | V 1/2 | 11 | · | 20 3/4 | 23 | · |
| 20.8 | 0.817 | 65.2 | 2.57 | W | 11 1/8 | 65 | · | · | 25 |
| 20.9 | 0.821 | 65.5 | 2.58 | W 1/4 | 11 1/4 | · | · | · | · |
| 20.9 | 0.824 | 65.8 | 2.59 | W 1/2 | 11 3/8 | · | · | · | · |
| 21.0 | 0.830 | 66.2 | 2.61 | W 3/4 | 11 1/2 | · | 21 | 24 | · |
| 21.2 | 0.834 | 66.5 | 2.62 | X | 11 5/8 | 66 1/4 | · | · | 26 1/4 |
| 21.2 | 0.836 | 66.7 | 2.63 | X 1/4 | 11 3/4 | · | · | · | · |
| 21.3 | 0.838 | 66.9 | 2.64 | X 1/2 | 11 7/8 | · | · | · | · |
| 21.5 | 0.846 | 67.5 | 2.66 | Y | 12 | 67 1/2 | 21 1/4 | 25 | 27 1/2 |
| 21.7 | 0.854 | 68.1 | 2.68 | Y 1/2 | 12 1/4 | · | · | · | · |
| 21.9 | 0.861 | 68.8 | 2.71 | Z | 12 1/2 | 68 3/4 | 21 3/4 | 26 | 28 3/4 |
| 22.1 | 0.870 | 69.4 | 2.73 | Z +1/2 | 12 3/4 | · | · | · | · |
| 22.3 | 0.879 | 70.2 | 2.76 | Z+1 | 13 | · | 22 | 27 | · |
| 22.6 | 0.890 | 71.0 | 2.80 | Z+1.5 | 13.5 | · | · | · | · |
| 22.7 | 0.893 | 71.3 | 2.81 | Z+2 | · | · | · | · | · |
| 22.9 | 0.902 | 72.0 | 2.83 | Z+2.5 | · | · | · | · | · |
| 23.0 | 0.908 | 72.5 | 2.85 | Z+3 | · | · | · | · | · |
| 23.3 | 0.915 | 73.0 | 2.87 | Z+3.5 | · | · | · | · | · |
| 23.5 | 0.924 | 73.7 | 2.90 | Z+4 | · | · | · | · | · |
| 23.6 | 0.927 | 74.0 | 2.91 | Z+4.5 | · | · | · | · | · |
| 23.9 | 0.940 | 75.0 | 2.95 | Z+5 | · | · | · | · | · |
| 24.3 | 0.955 | 76.2 | 3.00 | Z+6 | · | · | · | · | · |
