This is a chart that will be extremely helpful for you to determine the ring size that you need. You can either make use of a tape or a small piece of string to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on such string. This will be helpful for you to compare with the chart that is mentioned below. For extra width, you can add another size to accommodate.
| Ring Size | Circumference | |
|---|---|---|
| Inches | MM | |
| 1 | 1.61 | 41.01 |
| 2 | 1.64 | 42.70 |
| 3 | 1.69 | 42.90 |
| 4 | 1.72 | 43.60 |
| 5 | 1.76 | 44.80 |
| 6 | 1.81 | 46.10 |
| 7 | 1.87 | 47.40 |
| 8 | 1.89 | 48.00 |
| 9 | 1.92 | 48.70 |
| 10 | 1.97 | 50.00 |
| 11 | 2.02 | 51.20 |
| 12 | 2.04 | 51.90 |
| 13 | 2.09 | 53.10 |
| 14 | 2.14 | 54.40 |
| 15 | 2.16 | 55.10 |
| Ring Size | Circumference | |
|---|---|---|
| Inches | MM | |
| 16 | 2.22 | 56.30 |
| 17 | 2.24 | 57.00 |
| 18 | 2.30 | 58.30 |
| 19 | 2.32 | 58.90 |
| 20 | 2.37 | 60.20 |
| 21 | 2.39 | 60.80 |
| 22 | 2.44 | 62.10 |
| 23 | 2.47 | 62.70 |
| 24 | 2.52 | 64.00 |
| 25 | 2.54 | 64.60 |
| 26 | 2.59 | 65.90 |
| 27 | 2.65 | 67.20 |
| 28 | 2.67 | 67.80 |
| 29 | 2.72 | 69.10 |
| 30 | 2.80 | 71.00 |
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