Ring Size Guide
Find your size by measuring the inside diameter of a ring that already fits, or the circumference of your finger. Match it to the table below. If you are between sizes, choose the larger one.
How to measure
Ring you own: measure straight across the inside of the ring, edge to edge, in millimeters. Finger: wrap a thin strip of paper or string around the base of the finger, mark where it meets, and measure the length. Measure at the end of the day, when fingers are at their largest.
US ring size chart
| US size | Inside diameter (cm) | Inside diameter (in) | Circumference (cm) | Circumference (in) |
|---|---|---|---|---|
| 3 | 1.41 | 0.56 | 4.43 | 1.74 |
| 3.5 | 1.45 | 0.57 | 4.56 | 1.80 |
| 4 | 1.49 | 0.59 | 4.68 | 1.84 |
| 4.5 | 1.53 | 0.60 | 4.81 | 1.89 |
| 5 | 1.57 | 0.62 | 4.93 | 1.94 |
| 5.5 | 1.61 | 0.63 | 5.06 | 1.99 |
| 6 | 1.65 | 0.65 | 5.18 | 2.04 |
| 6.5 | 1.69 | 0.67 | 5.31 | 2.09 |
| 7 | 1.73 | 0.68 | 5.43 | 2.14 |
| 7.5 | 1.77 | 0.70 | 5.56 | 2.19 |
| 8 | 1.81 | 0.71 | 5.69 | 2.24 |
| 8.5 | 1.85 | 0.73 | 5.81 | 2.29 |
| 9 | 1.90 | 0.75 | 5.97 | 2.35 |
| 9.5 | 1.94 | 0.76 | 6.09 | 2.40 |
| 10 | 1.98 | 0.78 | 6.22 | 2.45 |
| 10.5 | 2.02 | 0.80 | 6.35 | 2.50 |
| 11 | 2.06 | 0.81 | 6.47 | 2.55 |
| 11.5 | 2.10 | 0.83 | 6.60 | 2.60 |
| 12 | 2.14 | 0.84 | 6.72 | 2.65 |
Measurements in millimeters are from the GIA ring size chart (4cs.gia.edu). Centimeters and inches are converted from those values. Sizes can vary slightly by maker.