Ring Size Guide
Calibrate your screen with any standard bank or ID card, then measure a ring you already own. Every screen is different, so calibration comes first.
1. Calibrate your screen
Hold a card flat against the screen and adjust until the outline matches the card’s width exactly.
Standard card · 85.6 mm
Not saved yet.
2. Measure a ring you own
Place the ring on the circle and adjust until the circle matches the ring’s inside edge.
Inner diameter 17.3 mmSize 7
Calibrate first for an accurate reading.
No ring to measure? Use string or paper
Wrap a strip snugly around the base of your finger, mark where it overlaps, and measure the length in millimeters.
Enter a length between 30 and 90 mm
US ring size chart
| US size | Inner diameter | Inner circumference |
|---|---|---|
| 3 | 14.1 mm | 44.2 mm |
| 3.5 | 14.5 mm | 45.5 mm |
| 4 | 14.9 mm | 46.8 mm |
| 4.5 | 15.3 mm | 48.0 mm |
| 5 | 15.7 mm | 49.3 mm |
| 5.5 | 16.1 mm | 50.6 mm |
| 6 | 16.5 mm | 51.9 mm |
| 6.5 | 16.9 mm | 53.1 mm |
| 7 | 17.3 mm | 54.4 mm |
| 7.5 | 17.7 mm | 55.7 mm |
| 8 | 18.1 mm | 57.0 mm |
| 8.5 | 18.5 mm | 58.2 mm |
| 9 | 18.9 mm | 59.5 mm |
| 9.5 | 19.4 mm | 60.8 mm |
| 10 | 19.8 mm | 62.1 mm |
| 10.5 | 20.2 mm | 63.3 mm |
| 11 | 20.6 mm | 64.6 mm |
| 11.5 | 21.0 mm | 65.9 mm |
| 12 | 21.4 mm | 67.2 mm |
| 12.5 | 21.8 mm | 68.5 mm |
| 13 | 22.2 mm | 69.7 mm |
- How accurate is an on-screen ring sizer?
- After calibrating with a standard card it is a helpful estimate. For the most accurate fit, Rocco can size you in the studio with professional ring sizers.
- Should wide bands be sized differently?
- Wide bands (6 mm and up) often fit snugger, so many people choose a quarter to half size larger. Rocco can confirm in person.