Ring Size Guide
Ring Size Guide
A comfortable ring should slide over the knuckle with light resistance and sit securely without pinching. Fingers can change size with temperature and time of day, so measure more than once.
- Choose a ring that already fits the intended finger.
- Measure the inside diameter across the widest point in millimetres.
- Compare that measurement with the guide below.
Ring size chart (Australian sizes)
This table shows the same measurements as the printable guide above. Each size matches the inside diameter of a ring, measured edge to edge across the centre. The US column shows the US size that our ring listings pair with each Australian size (for example, “T/10”); “–” means no US equivalent is listed.
| Australian / UK size | Inside diameter (mm) | US size in our listings |
|---|---|---|
| F | 14.1 | – |
| F½ | 14.3 | – |
| G | 14.5 | – |
| G½ | 14.7 | – |
| H | 14.9 | – |
| H½ | 15.1 | – |
| I | 15.3 | – |
| J | 15.5 | – |
| J½ | 15.7 | – |
| K | 15.9 | 5 |
| K½ | 16.1 | – |
| L | 16.3 | 6 |
| L½ | 16.5 | – |
| M | 16.7 | 6.5 |
| M½ | 16.9 | – |
| N | 17.1 | 7 |
| N½ | 17.3 | – |
| O | 17.5 | 7.5 |
| O½ | 17.7 | – |
| P | 17.9 | 8 |
| P½ | 18.1 | – |
| Q | 18.3 | 8.5 |
| Q½ | 18.5 | – |
| R | 18.8 | 9 |
| R½ | 19.0 | – |
| S | 19.2 | 9.5 |
| S½ | 19.4 | – |
| T | 19.6 | 10 |
| T½ | 19.8 | – |
| U | 20.0 | 10.5 |
| U½ | 20.2 | – |
| V | 20.4 | 11 |
| V½ | 20.6 | – |
| W | 20.8 | 11.5 |
| W½ | 21.0 | – |
| X | 21.2 | 12 |
| X½ | 21.4 | – |
| Y | 21.6 | 12.5 |
| Z | 21.8 | 13 |
| Z½ | 22.0 | – |
| Z+1 | 22.4 | 13.5 |
How to use the chart
- Choose a ring that already fits the finger you are buying for.
- Measure its inside diameter across the centre in millimetres, not including the metal.
- Find the closest diameter in the table. If the ring falls between two sizes, order the larger size.
- To use the printed guide, print the image at 100% scale. Do not use “Scale to Fit”, “Shrink” or “Expand”. Then place your ring over the circles and match its inside edge to the nearest circle.
Wide bands can feel tighter than narrow bands in the same size, and tungsten, titanium and zirconium rings often cannot be resized easily. Check the band width on the product page before ordering. Our men’s jewellery sizing guide and ring materials guide have more detail.
Need a second opinion? Visit us at 587 Chapel Street, South Yarra, email info@theodoremensjewellery.com or call +61 435 619 821.
