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Click Here for Ring Size Chart
| RING SIZE | INCHES | METRIC |
| 4 | 1 13/16 | 46.5 |
| 4 1/2 | 1 7/8 | 47.8 |
| 5 | 1 15/16 | 49 |
| 5 1/2 | 2 | 50.3 |
| 6 | 2 1/16 | 51.5 |
| 6 1/2 | 2 1/8 | 52.8 |
| 7 | 2 3/16 | 54 |
| 7 1/2 | 2 1/4 | 55.3 |
| 8 | 2 5/16 | 56.6 |
| 8 1/2 | 2 3/8 | 57.8 |
| 9 | 2 7/16 | 59.1 |
| 9 1/2 | 2 1/2 | 60.3 |
| 10 | 2 9/16 | 61.6 |
| 10 1/2 | 2 5/8 | 62.8 |
| 11 | 2 11/16 | 64.1 |
| 11 1/2 | 2 3/4 | 65.3 |
| 12 | 2 13/16 | 66.6 |
| 12 1/2 | 2 7/8 | 67.9 |
| 13 | 2 15/16 | 69.1 |
| Canadian& U.S. | Inside Diameter (in millimeters) |
United Kingdom | Japanese | Inside Circumference (in millimeters) |
| 4 | 14.8mm | H 1/2 | 7 | 46.5mm |
| 4 1/2 | 15.2mm | I 1/2 | 8 | 48mm |
| 5 | 15.6mm | J 1/2 | 9 | 49mm |
| 5 1/2 | 16mm | L | 10 | 50.5mm |
| 6 | 16.4mm | M | 12 | 52mm |
| 6 1/2 | 16.8mm | N | 13 | 53mm |
| 7 | 17.3mm | O | 14 | 54.5mm |
| 7 1/2 | 17.7mm | P | 15 | 55.5mm |
| 8 | 18.1mm | Q | 16 | 57mm |
| 8 1/2 | 18.5mm | Q 1/2 | 17 | 58mm |
| 9 | 18.9mm | R 1/2 | 18 | 59.5mm |
| 9 1/2 | 19.3mm | S 1/2 | 20 | 61mm |
| 10 | 19.7mm | T 1/2 | 21 | 62mm |
| 10 1/2 | 20.1mm | U 1/2 | 22 | 63.5mm |
| 11 | 20.6mm | V 1/2 | 24 | 64.5mm |
| 11 1/2 | 21mm | W 1/2 | 25 | 66mm |
| 12 | 21.4mm | Y | 26 | 67.5mm |
| 12 1/2 | 21.8mm | Z | 27 | 68.5mm |
| 13 | 22.2mm | Z +1 | 28 | 70mm |
| 13 1/2 | 22.6mm | Z +2 | 31 | 72.5mm |
| 14 | 23mm | Z +3 | 31 | 72.5mm |
| 14 1/2 | 23.4mm | Z +4 | 32 | 74mm |
| 15 | 23.9mm | Z +5 | 33 | 75mm |
