To measure your ring size at home, wrap a strip of paper or string around the base of your finger, mark where it overlaps, then measure that length in millimetres. That number is your finger's circumference, and it maps straight to an Australian ring size (a letter from A to Z). It takes about two minutes and you don't need anything fancy.
Below is the full method, an Australian ring size chart, and the little tricks that stop you ordering the wrong size.
The quickest way to measure your ring size at home
Grab a strip of paper about 1cm wide (or a piece of string) and a ruler. Wrap it snugly around the base of the finger you want to wear the ring on. Mark the spot where the paper meets itself, lay it flat, and measure the length in millimetres. That length is your circumference. Match it to the chart below to find your Australian letter size.
Do this at the end of the day when your fingers are at their largest, and measure two or three times so you're confident in the number.
Australian ring size chart
Australia uses letters (A to Z) for ring sizes. Here's how the most common women's sizes line up with finger circumference and diameter.
| AU size | Circumference (mm) | Inside diameter (mm) | US size |
|---|---|---|---|
| G | 44.2 | 14.1 | 3.5 |
| H | 45.5 | 14.5 | 4 |
| J | 48.0 | 15.3 | 5 |
| L | 50.6 | 16.1 | 5.5 |
| M | 51.9 | 16.5 | 6 |
| N | 53.1 | 16.9 | 6.5 |
| O | 54.4 | 17.3 | 7 |
| P | 55.7 | 17.7 | 7.5 |
| Q | 57.0 | 18.1 | 8 |
| S | 59.5 | 18.9 | 9 |
| U | 62.1 | 19.8 | 10 |
If your measurement lands between two sizes, size up. A ring that's a touch loose is comfortable; one that's too tight won't go on. For the full reference, see our ring size guide.
How to measure using a ring you already own
If you already have a ring that fits the right finger, you can skip the string entirely. Measure the inside diameter of the ring (edge to edge across the middle) in millimetres, then match that number to the "inside diameter" column in the chart above. This is often the most accurate home method because a real ring already accounts for the shape of your finger.
One tip: measure a ring you wear on the same finger you're buying for. Your fingers are all slightly different sizes, and your dominant hand usually runs a little larger.
String vs existing ring vs printable sizer: which is best?
| Method | What you need | Accuracy | Best for |
|---|---|---|---|
| String or paper | Paper strip, ruler | Good | A quick measure when you own no rings |
| Existing ring | A ring that fits, ruler | Best | Most accurate everyday option |
| Printable sizer | Printer, scissors | Good | People who like a guided template |
Small things that change your ring size
Your fingers aren't a fixed size all day, and that's normal. Heat, exercise and salty food make them swell, so a morning measurement can read a half-size smaller than an evening one. Cold weather shrinks them. Knuckles matter too: if yours are larger than the base of your finger, size to slide comfortably over the knuckle, not just to sit at the base.
Our rings and stacking bands come in sizes 6, 8 and 10 (US), which cover most women's fingers. Browse the full range over on the rings collection.
Frequently asked questions
What is the average ring size for women in Australia?
The most common women's ring sizes in Australia fall between M and P, which is roughly a US 6 to 7.5. It varies by finger and hand, so always measure rather than assume.
Should I size up or down if I'm between sizes?
Size up. A slightly loose ring is comfortable and easy to wear, while a too-tight ring is hard to get on and off and can feel uncomfortable by the end of the day.
How do I convert an Australian ring size to a US size?
Australian sizes use letters and US sizes use numbers. As a guide, AU M is about US 6, AU O is about US 7, and AU Q is about US 8. Use the chart above for the exact match.
What's the most accurate way to measure at home?
Measuring the inside diameter of a ring you already wear on the same finger is the most accurate home method, because it already accounts for your knuckle and finger shape.
When is the best time of day to measure?
Measure at the end of the day, when your fingers are at their largest. Avoid measuring when you're cold, just out of the water, or straight after exercise.
Now you know your size, the fun part begins. Find your colour over on our bestsellers and pick the ring that makes you smile. Wear the joy.