Typically rings should be made to a standard size, however you will find that many ring size guides differ.
Our rings are made to the standard USA sizes, we then provide a guide as to the nearest UK size (There is not always an exact match).
We recommend using a ring sizer mandrel with both UK & USA sizes.
Below you will find a ring size guide which also shows the inside diameter of of our rings which should be used for a more accurate measurement.
| US size | Inside Diameter | Approx UK size |
| 3 | 14.0mm | F |
| 3.5 | 14.4mm | G |
| 4 | 14.8mm | H |
| 4.5 | 15.2mm | I |
| 5 | 15.6mm | J 1/2 |
| 5.5 | 16.0mm | K 1/2 |
| 6 | 16.5mm | L 1/2 |
| 6.5 | 16.9mm | M 1/2 |
| 6.75 | 17.1mm | N |
| 7 | 17.3mm | O |
| 7.5 | 17.7mm | P |
| 8 | 18.1mm | Q |
| 8.5 | 18.5mm | R |
| 9 | 18.9mm | S |
| 9.5 | 19.4mm | S 3/4 |
| 10 | 19.8mm | T 1/2 |
| 10.5 | 20.2mm | U 1/2 |
| 11 | 20.6mm | V 1/2 |
| 11.5 | 21.0mm | W 1/2 |
| 12 | 21.4mm | Y |
| 12.5 | 21.8mm | Z |
| 13 | 22.2mm | Z +1 |
| 13.5 | 22.6mm | Z +2 |
| 14 | 23.0mm | Z +3 |
| 14.5 | 23.4mm | Z +4 |
| 15 | 23.8mm | Z +5 |
| 15.5 | 24.2mm | Z +6 |
| 16 | 24.6mm | Z +7 |