Every SRX ring is made to order in your exact size. We craft US sizes 4–11 in half sizes — find yours two ways below.
Measure a ring you already own
Take a ring that fits the intended finger well and measure the inside diameter in millimeters, edge to edge across the center. Match it to the chart.
Measure your finger
Wrap a thin strip of paper or a piece of string snugly around the base of your finger, mark where it overlaps, and measure the length in millimeters — that's the inside circumference. Match it to the chart.
| US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 4 | 14.9 | 46.8 |
| 4.5 | 15.3 | 48.0 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.9 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.4 |
| 7.5 | 17.7 | 55.7 |
| 8 | 18.1 | 57.0 |
| 8.5 | 18.5 | 58.3 |
| 9 | 19.0 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
| 10.5 | 20.2 | 63.4 |
| 11 | 20.6 | 64.6 |
Tips for a true fit
- Measure at the end of the day, when fingers are at their largest — cold fingers run smaller.
- Measure the exact finger you'll wear the ring on; left and right hands can differ by half a size.
- If your knuckle is noticeably wider than the base of your finger, measure both and choose a size in between.
- Between sizes? Size up — especially for wider bands, which wear more snugly.
- Wider bands (2.5mm and up) fit tighter than thin bands; consider a half size up if you're on the edge.
Still unsure? Write to us before you order — we're happy to help you land on the right size.