| Indian Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 6 | 14.1 mm | 44.2 mm |
| 7 | 14.5 mm | 45.5 mm |
| 8 | 15.0 mm | 47.0 mm |
| 9 | 15.7 mm | 49.3 mm |
| 10 | 16.1 mm | 50.6 mm |
| 11 | 16.5 mm | 51.9 mm |
| 12 | 16.9 mm | 53.1 mm |
| 13 | 17.3 mm | 54.4 mm |
| 14 | 17.7 mm | 55.7 mm |
| 15 | 17.7 mm | 57.0 mm |
| 16 | 18.6 mm | 58.3 mm |
| 17 | 19.0 mm | 59.5 mm |
| 18 | 19.4 mm | 60.8 mm |
| 19 | 19.8 mm | 62.1 mm |
| 20 | 20.2 mm | 63.4 mm |




