STEP 1: Cut a piece of thread and wrap it around your finger.
STEP 2: Simply put a mark or cut where the thread crosses each other
STEP 3 : Measure the length of the thread in MM.
| RING SIZE (INDIAN) | CIRCUMFERENCE (in MM) |
| 1 | 41.01 |
| 2 | 42.7 |
| 3 | 42.9 |
| 4 | 43.6 |
| 5 | 44.8 |
| 6 | 46.1 |
| 7 | 47.4 |
| 8 | 48 |
| 9 | 48.7 |
| 10 | 50 |
| 11 | 51.2 |
| 12 | 51.9 |
| 13 | 53.1 |
| 14 | 54.4 |
| 15 | 55.1 |
| 16 | 56.3 |
| 17 | 57 |
| 18 | 58.3 |
| 19 | 58.9 |
| 20 | 60.2 |
| 21 | 60.8 |
| 22 | 62.1 |
| 23 | 62.7 |
| 24 | 64 |
| 25 | 63.6 |
| 26 | 65.9 |