American Signet Rings · The fit guide
A meaningful ring deserves the right fit.
Find your size before we engrave your story. Start with a ring sizer, then use the chart as a measurement reference.
Measure with confidence
Measure the finger where you plan to wear your signet ring. The sizer should sit comfortably at the base and pass over your knuckle with slight resistance.
Check the fit more than once, with your hands at a normal temperature. Visiting your local jeweler is also a good option. They can measure your finger and help you confirm a comfortable fit for your chosen band width.
Choose a round ring that fits the same finger. Measure straight across the inside, from inner edge to inner edge, in millimeters. Do not include the metal band.
Match the inside diameter to the chart below. Ruler measurements, paper and string offer an estimate; confirm with a sizer before ordering.
Your measurement reference
Find your US size using the inside diameter or circumference. Measurements are approximate; sizes offered vary by ring style.
| US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 3 | 14.1 | 44.2 |
| 3¼ | 14.3 | 44.8 |
| 3½ | 14.5 | 45.5 |
| 3¾ | 14.7 | 46.1 |
| 4 | 14.9 | 46.8 |
| 4¼ | 15.1 | 47.4 |
| 4½ | 15.3 | 48.0 |
| 4¾ | 15.5 | 48.7 |
| 5 | 15.7 | 49.3 |
| 5¼ | 15.9 | 50.0 |
| 5½ | 16.1 | 50.6 |
| 5¾ | 16.3 | 51.2 |
| 6 | 16.5 | 51.9 |
| 6¼ | 16.7 | 52.5 |
| 6½ | 16.9 | 53.1 |
| 6¾ | 17.1 | 53.8 |
| US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 7 | 17.3 | 54.4 |
| 7¼ | 17.5 | 55.1 |
| 7½ | 17.7 | 55.7 |
| 7¾ | 17.9 | 56.3 |
| 8 | 18.2 | 57.2 |
| 8¼ | 18.3 | 57.6 |
| 8½ | 18.5 | 58.3 |
| 8¾ | 18.8 | 58.9 |
| 9 | 19.0 | 59.5 |
| 9¼ | 19.2 | 60.2 |
| 9½ | 19.4 | 60.8 |
| 9¾ | 19.6 | 61.4 |
| 10 | 19.8 | 62.1 |
| 10¼ | 20.0 | 62.7 |
| 10½ | 20.2 | 63.4 |
| US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 10¾ | 20.4 | 64.0 |
| 11 | 20.6 | 64.6 |
| 11¼ | 20.8 | 65.3 |
| 11½ | 21.0 | 65.9 |
| 11¾ | 21.2 | 66.6 |
| 12 | 21.4 | 67.2 |
| 12¼ | 21.6 | 67.8 |
| 12½ | 21.8 | 68.5 |
| 12¾ | 22.0 | 69.1 |
| 13 | 22.2 | 69.7 |
| 13¼ | 22.4 | 70.4 |
| 13½ | 22.6 | 71.0 |
Diameter measures across the inside of a ring. Circumference measures around the inside. This chart is a reference table, not a printable ring sizer.
Fingers can change size during the day. Avoid measuring when your hands are very cold or unusually swollen.
A wider band may feel snugger than a narrow one. Confirm the fit with a sizer close to your chosen ring’s width.
Your ring should pass over the knuckle without forcing it and stay secure at the base of your finger.
Made personal. Built to last.
Send us your measurements and the ring you have in mind. We’ll help you take the next step before engraving begins.
Ask us about your size