J&I Size Guide
- Have an existing ring that fits, simply measure the inside diameter of the ring and match to find your ring size in the chart below
- Knowing your ring size but not in Australian size, convert it by the chart below
Please use the chart below to find your ring size.
Inside Diameter (mm) | Inside Circumference (mm) | AU / UK Size | US Size |
13.1 | 41.1 | D | - |
13.3 | 41.7 | D 1/2 | 2 |
13.5 | 42.4 | E | - |
13.7 | 43 | E 1/2 | 2.5 |
13.9 | 43.6 | F | - |
14.1 | 44.2 | F 1/2 | 3 |
14.3 | 44.9 | G | - |
14.5 | 45.5 | G 1/2 | 3 1/2 |
14.7 | 46.1 | H | - |
14.9 | 46.8 | H 1/2 | 4 |
15.1 | 47.4 | I | - |
15.3 | 48 | I 1/2 | 4 1/2 |
15.5 | 48.6 | J | - |
15.7 | 49.3 | J 1/2 | 5 |
15.9 | 49.9 | K | - |
16.1 | 50.5 | K 1/2 | 5 1/2 |
16.3 | 51.2 | L | - |
16.5 | 51.8 | L 1/2 | 6 |
16.7 | 52.4 | M | - |
16.9 | 53 | M 1/2 | 6 1/2 |
17.1 | 53.7 | N | - |
17.3 | 54.3 | N 1/2 | 7 |
17.5 | 54.9 | O | - |
17.7 | 55.6 | O 1/2 | 7 1/2 |
17.9 | 56.2 | P | - |
18.1 | 56.8 | P 1/2 | 8 |
18.3 | 57.4 | Q | - |
18.5 | 58.1 | Q 1/2 | 8 1/2 |
18.8 | 59 | R | - |
19 | 59.6 | R 1/2 | 9 |
19.2 | 60.3 | S | - |
19.4 | 60.9 | S 1/2 | 9 1/2 |
19.6 | 61.5 | T | - |
19.8 | 62.2 | T 1/2 | 10 |
20 | 62.8 | U | - |
20.2 | 63.4 | U 1/2 | 1O 1/2 |
20.4 | 64 | V | - |
20.6 | 64.7 | V 1/2 | 11 |
20.8 | 65.3 | W | - |
21 | 65.9 | W 1/2 | 11 1/2 |
21.2 | 66.6 | X | - |
21.4 | 67.2 | X 1/2 | 12 |
21.6 | 67.8 | Y | - |
21.8 | 68.4 | Y 1/2 | 12 1/2 |
22 | 69.1 | Z | - |
22.2 | 69.7 | Z 1/2 | 13 |
22.4 | 70.3 | Z+1 | - |
22.6 | 71 | Z+1 1/2 | 13 1/2 |
22.8 | 71.6 | Z+2 | - |