Ring Sizing Chart
| USA/Canada | Ring Diameter (MM) | United Kingdom | France | Germany | Japan | Switzerland |
|---|---|---|---|---|---|---|
| 3 | 14.0 mm. | F | 44 | 14 | 4 | 4 |
| 3½ | 14.4 mm. | G | 45¼ | 14½ | 5½ | 6⅓ |
| 4 | 14.8 mm. | H½ | 46½ | 15 | 7 | 6½ |
| 4½ | 15.2 mm. | I½ | 47¾ | 15¼ | 8 | 8 |
| 5 | 15.6 mm. | J½ | 49 | 15¾ | 9 | 9½ |
| 5½ | 16.0 mm. | L | 50¾ | 16 | 10½ | 10¾ |
| 6 | 16.5 mm. | M | 51½ | 16½ | 12 | 12¾ |
| 6½ | 16.9 mm. | N | 52¾ | 17 | 13 | 14 |
| 7 | 17.3 mm. | O | 54 | 17¼ | 14 | 15¼ |
| 7½ | 17.7 mm. | P | 55¼ | 17¾ | 15 | 16½ |
| 8 | 18.2 mm. | Q | 56¾ | 18 | 16 | 17¾ |
| USA/Canada | Ring Diameter (MM) | United Kingdom | France | Germany | Japan | Switzerland |
|---|---|---|---|---|---|---|
| 8½ | 18.6 mm. | Q½ | 58 | 18½ | 17 | 18½ |
| 9 | 19.0 mm. | R½ | 59¼ | 19 | 18 | 20 |
| 9½ | 19.4 mm. | S½ | 60¾ | 19½ | 19 | 21 |
| 10 | 19.8 mm. | T½ | 61¾ | 20 | 20 | 21¾ |
| 10½ | 20.2 mm. | U½ | 62¾ | 20¼ | 22 | 22¾ |
| 11 | 20.6 mm. | V½ | 64¼ | 20¾ | 23 | 24 |
| 11½ | 21.0 mm. | W½ | 66 | 21 | 24 | 25¾ |
| 12 | 21.4 mm. | Y | 67¼ | 21¼ | 25 | 27½ |
| 12½ | 21.8 mm. | Z | 68 | 21¾ | 26 | 28¾ |
| 13 | 22.2 mm. | Z + 1 | 69 | 22 | 27 | 29¼ |
| 13½ | 22.6 mm. | Z + 1.5 | 71 | 22.6 | – | 31 |