Ring size guide
A general U.S. ring size reference to help you find your fit. Check each product’s listed size or adjustable fit before ordering; not every style is available in every size.
Measure a ring you already own
Choose a ring that fits the intended finger. Measure straight across its inside opening in millimeters, excluding the metal edges. Compare that inside diameter with the table.
Measure your finger
Wrap a narrow paper strip around your finger without tightening it. Mark where the ends overlap and measure that length in millimeters. This is your finger’s circumference. Allow room for the ring to pass over your knuckle.
| U.S. size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 4 | 14.9 | 46.8 |
| 5 | 15.7 | 49.3 |
| 6 | 16.5 | 51.9 |
| 7 | 17.3 | 54.4 |
| 8 | 18.1 | 57 |
| 9 | 18.9 | 59.5 |
| 10 | 19.8 | 62.1 |
| 11 | 20.6 | 64.6 |
Adjustable rings
Adjustable does not mean one size fits everyone. Check the individual listing and avoid forcing a ring open or closed.
Need help with a specific style?
Email twnsxco@gmail.com with the product name and your measurement before ordering. This chart is a general reference, not a statement of the measured size or adjustment range of a TWNSX product.