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 | Inside Circumference | Sizes | |
MM | MM | British & Australian | US & Canada |
9.91 | 31.13 | - | 0 |
10.72 | 33.68 | - | 0 |
11.53 | 36.22 | - | 0 |
11.95 | 37.54 | A | 1-Feb |
12.18 | 38.26 | A 1/2 | 3-Apr |
12.37 | 38.86 | B | 1 |
12.6 | 39.58 | B 1/2 | 1 1/4 |
12.78 | 40.15 | C | 1 1/2 |
13 | 40.84 | C 1/2 | 1 3/4 |
13.21 | 41.5 | D | 2 |
13.41 | 42.13 | D 1/2 | 2 1/4 |
13.61 | 42.76 | E | 2 1/2 |
13.83 | 43.45 | E 1/2 | 2 3/4 |
14.05 | 44.14 | F | 3 |
14.15 | 44.45 | F 1/2 | 3 1/8 |
14.25 | 44.77 | F 3/4 | 3 1/4 |
14.36 | 45.11 | G | 3 3/8 |
14.45 | 45.4 | G 1/4 | 3 1/2 |
14.56 | 45.74 | G 1/2 | 3 5/8 |
14.65 | 46.02 | H | 3 3/4 |
14.86 | 46.68 | H 1/2 | 4 |
15.04 | 47.25 | I | 4 1/4 |
15.27 | 47.97 | I 1/2 | 4 1/2 |
15.4 | 48.38 | J | 4 5/8 |
15.53 | 48.79 | J 1/4 | 4 3/4 |
15.7 | 49.32 | J 1/2 | 5 |
15.8 | 49.64 | K | 5 1/8 |
15.9 | 49.95 | K 1/4 | 5 1/4 |
16 | 50.27 | K 1/2 | 5 3/8 |
16.1 | 50.58 | L | 5 1/2 |
16.3 | 51.21 | L 1/4 | 5 3/4 |
16.41 | 51.55 | L 1/2 | 5 7/8 |
16.51 | 51.87 | M | 6 |
16.71 | 52.5 | M 1/2 | 6 1/4 |
16.92 | 53.16 | N | 6 1/2 |
17.13 | 53.82 | N 1/2 | 6 3/4 |
17.35 | 54.51 | O | 7 |
17.45 | 54.82 | O 1/2 | 7 1/4 |
17.75 | 55.76 | P | 7 1/2 |
17.97 | 56.45 | P 1/2 | 7 3/4 |
18.19 | 57.15 | Q | 8 |
18.35 | 57.65 | Q 1/2 | 8 1/4 |
18.53 | 58.21 | Q 3/4 | 8 1/2 |
18.61 | 58.47 | R | 8 5/8 |
18.69 | 58.72 | R 1/4 | 8 3/4 |
18.8 | 59.06 | R 1/2 | 8 7/8 |
18.89 | 59.34 | R 3/4 | 9 |
19.1 | 60 | S | 9 1/8 |
19.22 | 60.38 | S 1/4 | 9 1/4 |
19.31 | 60.66 | S 1/2 | 9 3/8 |
19.41 | 60.98 | S 3/4 | 9 1/2 |
19.51 | 61.29 | T | 9 5/8 |
19.62 | 61.64 | T 1/4 | 9 3/4 |
19.84 | 62.33 | T 1/2 | 10 |
20.02 | 62.89 | U | 10 1/4 |
20.2 | 63.46 | U 1/2 | 10 1/2 |
20.32 | 63.84 | V | 10 5/8 |
20.44 | 64.21 | V 1/4 | 10 3/4 |
20.68 | 64.97 | V 1/2 | 11 |
20.76 | 65.22 | W | 11 1/8 |
20.85 | 65.5 | W 1/4 | 11 1/4 |
20.94 | 65.78 | W 1/2 | 11 3/8 |
21.08 | 66.22 | W 3/4 | 11 1/2 |
21.18 | 66.54 | X | 11 5/8 |
21.24 | 66.73 | X 1/4 | 11 3/4 |
21.3 | 66.92 | X 1/2 | 11 7/8 |
21.49 | 67.51 | Y | 12 |
21.69 | 68.14 | Y 1/2 | 12 1/4 |
21.89 | 68.77 | Z | 12 1/2 |
22.1 | 69.43 | Z +1/2 | 12 3/4 |
22.33 | 70.15 | Z+1 | 13 |
22.6 | 71 | Z+1.5 | 13.5 |
22.69 | 71.28 | Z+2 | - |
22.92 | 72 | Z+2.5 | - |
23.06 | 72.45 | Z+3 | - |
23.24 | 73.01 | Z+3.5 | - |
23.47 | 73.73 | Z+4 | - |
23.55 | 73.98 | Z+4.5 | - |
23.87 | 74.99 | Z+5 | - |
24.27 | 76.25 | Z+6 | - |