Measure the inside diameter of an existing ring or wrap a strip of paper around your finger.
| US Size | Diameter (mm) | Circumference (mm) | Standard Fit |
|---|---|---|---|
| 6 | 16.5 mm | 51.8 mm | Small / Pinky |
| 7 | 17.3 mm | 54.4 mm | Medium / Ring Finger |
| 8 | 18.1 mm | 56.9 mm | Medium / Middle Finger |
| 9 | 18.9 mm | 59.5 mm | Large / Index Finger |
| 10 | 19.8 mm | 62.1 mm | X-Large / Thumb |
| 11 | 20.6 mm | 64.6 mm | XX-Large |