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At Blue Turtles we use the standard US system of ring sizing.
The size conversion chart below compares US sizes with their Australian and inside diameter equivalents.
If you are unsure of your ring size you can use an existing ring and measure its inside diametre – the distance across from the inner edges of the ring – and find the closest comparison on the chart.
| USA | Australian | Inside Diametre (mm) |
|---|---|---|
| 6 | L ½ | 16.5 |
| 6.5 | M ½ | 16.9 |
| 7 | N ½ | 17.3 |
| 7.5 | O ½ | 17.75 |
| 8 | P ½ | 18.2 |
| 8.5 | Q ½ | 18.6 |
| 9 | R ½ | 19 |
| 9.5 | S ½ | 19.4 |
| 10 | T ½ | 19.8 |
| 10.5 | U ½ | 20.24 |
| 11 | V ½ | 20.66 |
| 11.5 | V 4/5 | 21 |
| 12 | X ½ | 21.5 |
| 12.5 | Y ½ | 21.9 |
| 13 | Z +1 | 22.3 |
| 13.5 | Z +3 | 23 |
| 14 | Z +4 | 23.5 |