Australia uses a ring sizing system based on alphabet letters, very similar to the UK system but with a few differences in how some sizes are labeled and what sizes are commonly stocked in Australian jewelry stores. If you know your Australian size and need to find your US, UK, or EU equivalent, or vice versa, this guide has the full chart.
Australian sizing follows the same underlying millimeter measurements as the UK system, so the conversions are consistent and reliable.
Australian Ring Size Conversion Chart
| Australian size | UK size | US size | EU size | Inner diameter (mm) |
|---|---|---|---|---|
| F | F | 3 | 44 | 14.1 |
| G | G | 3.5 | 45.5 | 14.5 |
| H | H | 4 | 46.8 | 14.9 |
| I | I | 4.25 | 47.4 | 15.1 |
| J | J | 4.75 | 48.7 | 15.5 |
| K | K | 5.25 | 49.9 | 15.9 |
| L | L | 5.75 | 51.2 | 16.3 |
| M | M | 6.25 | 52.5 | 16.7 |
| N | N | 6.75 | 53.8 | 17.1 |
| O | O | 7.25 | 55 | 17.5 |
| P | P | 7.75 | 56.3 | 17.9 |
| Q | Q | 8.25 | 57.8 | 18.4 |
| R | R | 8.75 | 59.1 | 18.8 |
| S | S | 9.25 | 60.4 | 19.2 |
| T | T | 9.75 | 61.6 | 19.6 |
| U | U | 10.25 | 62.8 | 20.0 |
| V | V | 10.75 | 64.1 | 20.4 |
| W | W | 11.25 | 65.4 | 20.8 |
| X | X | 11.5 | 66 | 21.0 |
| Z | Z | 13 | 69.7 | 22.2 |
Is Australian Ring Sizing the Same as UK?
Australian ring sizing uses the same letter-based system as the UK, and for most practical purposes the two are interchangeable. Both are based on the same inner diameter measurements in mm. Where they differ slightly is in the half-letter sizes: Australian retailers tend to stock full-letter sizes more commonly and use fewer half-letter designations than some UK retailers.
If you have a UK size in a half-letter like N½, the nearest Australian equivalent is either N or O, depending on where you fall in that range. If you are between sizes, go to the next full letter up for comfortable daily wear.
Converting from Australian to US Sizes
The US system uses numbers, so Australian letter sizes do not have an exact numerical equivalent. The conversion works through the millimeter column: find your Australian letter in the chart, read across to the US column, and use that number when shopping from US-based retailers.
The most commonly needed conversions: Australian N is US 6.75 (round to US 7), Australian L is US 5.75 (round to US 6), Australian P is US 7.75 (round to US 8). For the complete US perspective on these conversions, see our US to UK ring size guide which uses the same letter system.
How to Measure Your Ring Size in Australia
The measurement process is the same regardless of country. Use a paper strip to measure your circumference in mm, then find that circumference as your EU size, and read across the chart to find your Australian letter. Or use our ring size calculator to measure directly on your phone and get your size in all systems.
For a full guide to home measurement methods, see how to measure ring size at home. If you are buying across borders, always note your inner diameter in mm as your universal reference. For more on why different countries use different systems, see why ring sizes differ between countries.
FAQ
Is Australian ring size the same as UK?
Yes, for most practical purposes. Australian ring sizes use the same letter system as UK sizes and are based on the same inner diameter measurements in mm. The main difference is that Australian retailers more commonly stock full-letter sizes rather than half-letter sizes.
What is Australian ring size N in US?
Australian size N is approximately US 6.75, typically rounded to US 7 when shopping from US retailers.
What is Australian ring size P in US?
Australian size P is approximately US 7.75, rounded to US 8 for standard US sizing.
How do I convert my Australian ring size to EU?
Find your Australian letter in the chart and read across to the EU column. EU size values in this chart represent the inner circumference in mm.
