The easiest way
Measure a ring you already love.
Place a well-fitting ring on a ruler and measure the inside diameter straight across the centre. Match that measurement to the table below.
A considered fit
Ring Size Guide
A ring should feel effortless from the first moment. A professional fitting is always the most reliable option, but this guide is a useful way to find a confident starting point.
A little guidance
Measure your finger thoughtfully.
Use a narrow strip of paper or string, marking where it meets around the base of your finger. Measure that length in millimetres for the inside circumference. Avoid measuring when hands are especially cold or warm.
| Inside diameter mm | Inside circumference mm | Australian / NZ / UK | US / Canada |
|---|---|---|---|
| 14.9 | 46.8 | H | 4 |
| 15.3 | 48.0 | I | 4½ |
| 15.7 | 49.3 | J½ | 5 |
| 16.1 | 50.6 | K½ | 5½ |
| 16.5 | 51.9 | L½ | 6 |
| 16.9 | 53.2 | M½ | 6½ |
| 17.3 | 54.4 | N½ | 7 |
| 17.7 | 55.7 | O½ | 7½ |
| 18.1 | 57.0 | P½ | 8 |
| 18.5 | 58.2 | Q½ | 8½ |
| 19.0 | 59.5 | R½ | 9 |
| 19.4 | 60.8 | S½ | 9½ |
| 19.8 | 62.1 | T½ | 10 |
| 20.2 | 63.4 | U½ | 10½ |
| 20.6 | 64.6 | V½ | 11 |