About ring size |
| JP | Inner circumference |
US Canada |
UK Australia |
Italy Switzerland |
Germany | |
| mm | inches | |||||
| #4 | 43.98 | 1.735 | 3 | F | 4 | 14 |
| #5 | 45.03 | 1.79 | 3.5 | G | 5 1/4 | 14 1/2 |
| #6 | 46.08 | |||||
| #7 | 47.12 | 1.835 | 4 | H 1/2 | 7 1/4 | 15 |
| #8 | 48.12 | 1.89 | 4.5 | I 1/2 | 8 3/4 | 15 1/4 |
| #9 | 49.22 | 1.943 | 5 | J 1/2 | 9 1/2 | 15 3/4 |
| #10 | 50.27 | |||||
| #11 | 51.31 | 2 | 5.5 | L | 11 3/4 | 16 |
| #12 | 52.36 | 2.045 | 6 | M | 12 3/4 | 16 1/2 |
| #13 | 53.41 | 2.1 | 6.5 | N | 14 | 17 |
| #14 | 54.45 | 2.15 | 7 | O | 15 1/4 | 17 1/4 |
| #15 | 55.50 | 2.2 | 7.5 | P | 16 1/2 | 17 3/4 |
| #16 | 56.55 | 2.25 | 8 | Q | 17 3/4 | 18 |
| #17 | 57.60 | 2.3 | 8.5 | Q 1/2 | 18 1/2 | 18 1/2 |
| #18 | 58.64 | 2.35 | 8.75 | S | 19 3/4 | 19 |
| #19 | 59.69 | 2.4 | 9 | T | 21 | 19 1/2 |
| #20 | 60.74 | 2.46 | 9.5 | T 1/2 | 22 | 20 |
| #21 | 61.78 | 9.75 | ||||
| #22 | 62.83 | 2.51 | 10.25 | U 1/2 | 23 1/4 | 20 1/4 |
| #23 | 63.88 | 2.56 | 10.75 | V 1/2 | 24 | 20 3/4 |
| #24 | 64.93 | 2.61 | 11 | X | 25 3/4 | 21 |
| #25 | 65.97 | 2.63 | 11.25 | Y | 27 1/2 | 21 1/4 |
| #26 | 67.02 | 2.71 | 12 | Z | 28 3/4 | 21 3/4 |
| #27 | 68.07 | 2.76 | 29 1/4 | 22 | ||
| #28 | 69.11 | 2.80 | 12.75 | Z 1/2 | ||
| #29 | 70.16 | 2.84 | 13.25 | Z1 | ||
| #30 | 71.21 | 2.88 | 13.5 | Z2 | ||
| #31 | 72.26 | 2.93 | 14 | Z3 | ||