Find the most common women’s wedding band sizes in Australia — with AU size chart, diameter in mm, circumference, average ranges, wide band fit advice, and a free ring size calculator
⚠️ Proportional only — not exact pixel-to-mm. Always measure with a ruler for accurate fit.
| AU Size | Diameter (mm) | Circumference (mm) | 🇺🇸 US / Canada | 🇪🇺 EU / ISO | Wedding Fit |
|---|---|---|---|---|---|
| I | 14.4 mm | 45.1 mm | 4.25 | 45 | Small |
| J | 14.6 mm | 45.8 mm | 4.75 | 45.5 | Small |
| K | 14.8 mm | 46.5 mm | 5.25 | 46 | Small |
| L | 15.0 mm | 47.1 mm | 5.5 | 47 | Common |
| M | 15.3 mm | 48.0 mm | 6 | 47.5 | Popular ♀ |
| N ⭐ | 15.5 mm | 48.7 mm | 6.5 | 48 | Average ♀ |
| O | 15.7 mm | 49.3 mm | 7 | 49 | Popular ♀ |
| P | 16.0 mm | 50.2 mm | 7.5 | 50 | Common |
| Q | 16.2 mm | 50.9 mm | 8 | 51 | Larger |
| R | 16.5 mm | 51.7 mm | 8.5 | 51.5 | Large |
| S | 16.7 mm | 52.4 mm | 9 | 52 | Large |
| T | 17.0 mm | 53.2 mm | 9.5 | 53 | XL |
| U | 17.2 mm | 54.0 mm | 10 | 53.5 | XL |
| Band Width | How It Feels | Typical Advice | Best For |
|---|---|---|---|
| 1.5 – 2 mm | Light and delicate | Usual measured size often works | Stacking bands |
| 2 – 3 mm | Classic everyday fit | Best standard width for most women | Wedding bands |
| 3 – 4 mm | Slightly firmer fit | Consider half size up if knuckle is larger | Most practical |
| 4 – 6 mm | Noticeably tighter | Often safer to size up slightly | Statement bands |
| 6 mm+ | Much tighter across finger | Usually size up for comfort | Wide fashion rings |
Fingers swell in heat and shrink in cold. Measure at room temperature for the best fit.
Late afternoon and evening usually give the most realistic everyday fit.
Wedding bands often feel tighter than engagement rings because they cover more finger surface.
If your knuckle is much larger than the finger base, you may need a size that clears the knuckle comfortably.
Salty food, dehydration, and travel can temporarily change finger size.
Weight change, pregnancy, and hormones can affect long-term ring fit.
Use paper, string, or ribbon that will not stretch too much.
Wrap it at the base of the finger and make sure it can pass the knuckle.
This gives you the circumference of your finger.
Use a ruler and match the result to the chart above.
Measure at least 3 times during the day and use the average.
It should fit the exact finger where the wedding band will sit.
Measure straight across the inner opening in millimetres.
Use the Diameter column to find the closest Australian letter size.
If your wedding ring is wider than your engagement ring, it may feel tighter even when the letter size is the same. For wider bands, many buyers prefer a slightly roomier fit.