Measure with an Existing Ring Chart
| INTERNAL DIAMETER (MM) | 14.1 | 14.9 | 15.7 | 16.5 | 17.3 | 18.1 | 19.0 | 19.8 | 20.6 | 21.4 | 22.2 |
| US/CANADA RING SIZE | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| UK/AUSTRALIA RING SIZE | F | H | J | L | N | P | R | T | V | W | Z |
| GERMAN RING SIZE | 14 | 15 | 15 3/4 | 16 1/2 | 17 1/4 | 18 | 19 | 20 | 20 3/4 | 21 1/4 | 22 |
| INTERNAL DIAMETER (MM) | US/CAN RING SIZE | UK/AUS RING SIZE | GERMAN RING SIZE |
| 14.1 | 3 | F | 14 |
| 14.9 | 4 | H | 15 |
| 15.7 | 5 | J | 15 3/4 |
| 16.5 | 6 | L | 16 1/2 |
| 17.3 | 7 | N | 17 1/4 |
| 18.1 | 8 | P | 18 |
| 19.0 | 9 | R | 19 |
| 19.8 | 10 | T | 20 |
| 20.6 | 11 | V | 20 1/4 |
| 21.4 | 12 | X | 21 1/4 |
| 22.2 | 13 | Z | 22 |