Ring Size Guide
The most reliable size comes from a jeweler measuring the intended finger with a ring sizer similar in width to the ring you plan to wear. If that is not possible, use both home methods below and repeat the measurement at different times.
Before you measure
- Measure the exact finger and hand; dominant-hand fingers may be larger.
- Measure at a comfortable room temperature, not when hands are unusually cold or swollen.
- Check that the size passes over the knuckle without being loose at the base.
- Wider bands often feel tighter. Ask whether a wider style needs a size adjustment.
Method 1: measure a ring that already fits
Choose a round ring that fits the intended finger. Measure the inside diameter straight across the center in millimeters—do not include the metal. Match the diameter to the chart.
Method 2: measure the finger
Wrap a non-stretch strip of paper around the finger, mark where it overlaps, then measure the length in millimeters. This is the inside circumference. String can stretch and produce a loose result, so paper is preferable.
Print calibration:50 mm
When printing, select 100% or “Actual size.” Measure the line above; it must be exactly 50 mm.
US ring size chart
| US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 3 | 14.1 | 44.2 |
| 3.5 | 14.5 | 45.5 |
| 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 | 18.9 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
| 10.5 | 20.2 | 63.4 |
| 11 | 20.6 | 64.6 |
| 11.5 | 21.0 | 65.9 |
| 12 | 21.4 | 67.2 |
| 12.5 | 21.8 | 68.5 |
| 13 | 22.2 | 69.7 |
Between sizes? The best choice depends on knuckle size, band width, stacking, and whether the design can be resized. Contact us before ordering if the product page does not list your size or you are unsure.