Get the fit right the first time
Sizing guide
Two ways to nail your size at home. If your fingers are between sizes — go up. RFID rings are a hair thicker than a regular band.
Method 1 — String & ruler
Wrap a piece of string snugly around the base of your finger. Mark where it meets, lay it flat against a millimetre ruler, and find the matching size below.
Method 2 — Mandrel sizer
Slip your favourite ring on the tapered mandrel sizer ($4.99) until it stops, read the size off the side. Or wear it for a few hours to find a comfortable fit.
Tips
Measure at the end of the day when fingers are warmest and largest. Cold fingers shrink — the ring should slide off snugly, not freely.
Reference
US ring size table
| US size | Inner Ø (mm) | Inner Ø (in) | Circumference (mm) |
|---|---|---|---|
| 5 | 15.7 | 0.618 | 49.3 |
| 6 | 16.5 | 0.650 | 51.9 |
| 7 | 17.3 | 0.681 | 54.4 |
| 8 | 18.1 | 0.713 | 57.0 |
| 9 | 19.0 | 0.748 | 59.5 |
| 10 | 19.8 | 0.780 | 62.1 |
| 11 | 20.6 | 0.811 | 64.6 |
| 12 | 21.4 | 0.843 | 67.2 |
| 13 | 22.2 | 0.874 | 69.7 |
Not sure? Order the sizer first.
$4.99. Reusable. Ships in a padded envelope. Apply it as a credit toward your ring order — just include the order number in checkout notes.