Ring Size Guide
How to Measure Your Ring Size
Finding the right ring size is essential for a comfortable fit — snug enough to stay on, but easy to take off.
Measurement Method
- Wrap a thin strip of paper or string around your finger
- Mark where it overlaps, then measure the length in millimeters (mm)
- Use the size chart below to find your size
Ring Size Chart
| Size | Inner Diameter (mm) | Circumference (mm) |
|---|---|---|
| 6 | 16.5 | 51.8 |
| 7 | 17.3 | 54.4 |
| 8 | 18.1 | 56.9 |
| 9 | 18.9 | 59.5 |
| 10 | 19.8 | 62.1 |
| 11 | 20.6 | 64.6 |
| 12 | 21.4 | 67.2 |
| 13 | 22.2 | 69.8 |
Tips
- Measure at the end of the day when fingers are slightly larger for a more accurate size
- Smart Ring R10 is recommended to be worn snugly — a slightly tighter fit improves overnight monitoring accuracy
- If your measurement falls between two sizes, choose the larger size