
Measure an Existing Ring
- Select an existing ring that fits the desired finger.
- Measure the internal diameter of the ring (in mm).
- Use the below chart to determine your ring size.
INTERNAL DIAMETER (MM) | US/CAN RING SIZE | UK/AUS RING SIZE | GERMAN RING SIZE |
14.1 | 3 | F | 14 |
14.9 | 4 | H 1/2 | 15 |
15.7 | 5 | J 1/2 | 15 3/4 |
16.5 | 6 | L 1/2 | 16 1/2 |
17.3 | 7 | O | 17 1/4 |
18.1 | 8 | Q | 18 |
19 | 9 | S | 19 |
19.8 | 10 | U | 19 3/4 |
20.6 | 11 | W | 20 1/2 |
21.4 | 12 | Y | 21 1/2 |

Measure Your Finger
- Wrap a strip of paper around your finger where you’d like your ring to be.
- Make sure that the paper is pulled snug to your finger, the tighter the better, to find your best fit.
- Mark the spot where the paper meets and measure the distance with a ruler (mm).
- Use the below chart to determine your ring size.
Circumference (mm) | US/CAN Ring Size | UK/AUS Ring Size | German Ring Size | 44.2 | 3 | F | 14 |
46.8 | 4 | H 1/2 | 15 |
49.3 | 5 | J 1/2 | 15 3/4 |
51.9 | 6 | L 1/2 | 16 1/2 |
54.4 | 7 | O | 17 1/4 |
57.0 | 8 | Q | 18 |
59.5 | 9 | S | 19 |
62.1 | 10 | U | 19 3/4 |
64.6 | 11 | W | 20 1/2 |
67.2 | 12 | Y | 21 1/2 |