Ring size
The size in millimetres is the ring’s inner diameter. Measure a suitable ring or your finger circumference without pulling tight.
| Diameter, mm | Circumference, mm |
|---|---|
| 15 | 47.1 |
| 15.5 | 48.7 |
| 16 | 50.3 |
| 16.5 | 51.8 |
| 17 | 53.4 |
| 17.5 | 55.0 |
| 18 | 56.5 |
| 18.5 | 58.1 |
| 19 | 59.7 |
| 19.5 | 61.3 |
| 20 | 62.8 |
| 20.5 | 64.4 |
| 21 | 66.0 |
| 21.5 | 67.5 |
| 22 | 69.1 |
| 22.5 | 70.7 |
| 23 | 72.3 |
Measure several times. Wide rings and temperature affect the fit; confirm the final size with a jeweler.
Printable ruler
Print at 100% scale. Check the reference line with a ruler: 100 mm.
100 mm