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Finding the perfect ring size is essential for comfort and security. Our ring size chart below allows you to easily convert ring sizes across different international ring sizing systems, including Australian, US, UK, and European sizes and gives ring size measurements in both millimetres and inches.
Once you've got your ring size sorted, be sure to check out our Australian jewellery online store, including our most popular women's jewellery and - of course - our Rings Australia collection.
Ring Size Conversion & Measurements
Already know your ring measurement or need to convert a size between different measuring systems? Scroll down to our international and Australian Ring Size Chart for precise ring size measurements.
But what is my ring size?
If you’re unsure of your ring size and need help figuring it out, visit our guide on How to Measure Your Ring Size. This handy guide includes expert tips, different measuring methods, a link to our ring sizing kit, plus a free PDF tool to measure an existing ring.
Once you've worked out your ring size, come back to this page so you can see what size you need in different ring sizing systems.
How Do International Ring Sizes Compare?
Ring sizes vary across countries, and different jewellery stores may use different systems. The most common are:
- Australian & UK Sizes – Uses an alphabetical system (Wheat Sheaf)
- US & Canada Sizes – Uses a numerical system
- Europe Sizes - Uses numberical ISO sizes (more info below)
Sizes for Women & Men
There aren't different ring sizing systems for women and men: they are the same. Men's ring sizes are often be larger, and women's are often smaller, but all genders use the same sizing systems when it comes to rings.
Using the Ring Size Chart
Our chart below provides an easy reference to convert ring sizes between different measuring systems. It includes:
- Australian & UK alphabetical ring sizes
- US & Canadian numerical ring sizes
- ISO European ring size standards (mm)
- Inside diameter and circumference measurements
Scroll down to use our Ring Size Chart and find your ideal fit.
Ring size chart:
Other jewellery articles:
We've included conversions for the numerical (USA), alphabetical (or Wheatsheaf) and European ring sizes. The alphabetical or Wheatsheaf system is used for Australian ring sizes, but most Australian jewellers will also accept the USA numerical system.
Measurements for different international ring sizing systems don't precisely align, so this chart shows a close equivalence across the different systems based on commonly used USA ring size measurements. These differences are tiny enough that they shouldn't affect your chosen ring size, no matter which sizing system you're using.
ISO sizes are used in some European countries and these size numbers correspond with the internal circumference in millimetres. Some European countries use a slightly different system where 40mm is deducted from the ISO size (so a ring with a 44mm circumference will be a size 4 in this system).
(On a device? Best viewed in landscape)
| Inside Diameter: | Inside Circumference: | Ring Sizes: | ||||
|---|---|---|---|---|---|---|
| MM | Inches | MM (ISO size) |
Inches | Numerical (USA, Canada, etc.) |
Alphabetical (Australia, UK, NZ, etc.) |
European (ISO minus 40mm) |
| 11.6 mm | 0.458" | 36.5 mm | 1.438" | 0 | ||
| 11.8 mm | 0.466" | 37.2 mm | 1.463" | 1/4 | ||
| 12 mm | 0.474" | 37.8 mm | 1.488" | 2/4 | A | |
| 12.2 mm | 0.482" | 38.4 mm | 1.513" | 3/4 | A 1/2 | |
| 12.4 mm | 0.49" | 39.1 mm | 1.539" | 1 | B | |
| 12.6 mm | 0.498" | 39.7 mm | 1.564" | 1 1/4 | B 1/2 | |
| 12.9 mm | 0.506" | 40.4 mm | 1.589" | 1 1/2 | C | 0 |
| 13.1 mm | 0.514" | 41 mm | 1.614" | 1 3/4 | C 1/2 | 1 |
| 13.3 mm | 0.522" | 41.6 mm | 1.639" | 2 | D | |
| 13.5 mm | 0.53" | 42.3 mm | 1.664" | 2 1/4 | D 1/2 | 2 |
| 13.7 mm | 0.538" | 42.9 mm | 1.689" | 2 1/2 | E | 3 |
| 13.9 mm | 0.546" | 43.5 mm | 1.714" | 2 3/4 | E 1/2 | |
| 14.1 mm | 0.554" | 44.2 mm | 1.74" | 3 | F | 4 |
| 14.3 mm | 0.562" | 44.8 mm | 1.765" | 3 1/4 | F 1/2 | |
| 14.3 mm | 0.562" | 45 mm | 1.77" | - | G | 5 |
| 14.5 mm | 0.57" | 45.5 mm | 1.79" | 3 1/2 | G 1/2 | |
| 14.7 mm | 0.578" | 46.1 mm | 1.815" | 3 3/4 | H | 6 |
| 14.9 mm | 0.586" | 46.7 mm | 1.84" | 4 | H 1/2 | |
| 15.1 mm | 0.594" | 47.4 mm | 1.865" | 4 1/4 | I | 7 |
| 15.3 mm | 0.602" | 48 mm | 1.89" | 4 1/2 | I 1/2 | 8 |
| 15.5 mm | 0.61" | 48.7 mm | 1.915" | 4 3/4 | J | |
| 15.7 mm | 0.618" | 49.3 mm | 1.941" | 5 | J 1/2 | 9 |
| 15.9 mm | 0.626" | 49.9 mm | 1.966" | 5 1/4 | K | 10 |
| 16.1 mm | 0.634" | 50.6 mm | 1.991" | 5 1/2 | K 1/2 | |
| 16.3 mm | 0.642" | 51.2 mm | 2.016" | 5 3/4 | L | 11 |
| 16.5 mm | 0.65" | 51.8 mm | 2.041" | 6 | L 1/2 | |
| 16.7 mm | 0.658" | 52.5 mm | 2.066" | 6 1/4 | M | 12 |
| 16.9 mm | 0.666" | 53.1 mm | 2.091" | 6 1/2 | M 1/2 | 13 |
| 17.1 mm | 0.674" | 53.8 mm | 2.116" | 6 3/4 | N | |
| 17.3 mm | 0.682" | 54.4 mm | 2.141" | 7 | N 1/2 | 14 |
| 17.5 mm | 0.69" | 55 mm | 2.167" | 7 1/4 | O | 15 |
| 17.7 mm | 0.698" | 55.7 mm | 2.192" | 7 1/2 | O 1/2 | |
| 17.9 mm | 0.706" | 56.3 mm | 2.217" | 7 3/4 | P | 16 |
| 18.1 mm | 0.714" | 56.9 mm | 2.242" | 8 | P 1/2 | 17 |
| 18.3 mm | 0.722" | 57.6 mm | 2.267" | 8 1/4 | Q | |
| 18.5 mm | 0.73" | 58.2 mm | 2.292" | 8 1/2 | Q 1/2 | 18 |
| 18.7 mm | 0.738" | 58.9 mm | 2.317" | 8 3/4 | R | 19 |
| 18.9 mm | 0.746" | 59.5 mm | 2.342" | 9 | R 1/2 | |
| 19.2 mm | 0.754" | 60.1 mm | 2.368" | 9 1/4 | S | 20 |
| 19.4 mm | 0.762" | 60.8 mm | 2.393" | 9 1/2 | S 1/2 | 21 |
| 19.6 mm | 0.77" | 61.4 mm | 2.418" | 9 3/4 | T | |
| 19.8 mm | 0.778" | 62.1 mm | 2.443" | 10 | T 1/2 | 22 |
| 20 mm | 0.786" | 62.7 mm | 2.468" | 10 1/4 | U | |
| 20.2 mm | 0.794" | 63.3 mm | 2.493" | 10 1/2 | U 1/2 | 23 |
| 20.4 mm | 0.802" | 64 mm | 2.518" | 10 3/4 | V | 24 |
| 20.6 mm | 0.81" | 64.6 mm | 2.543" | 11 | V 1/2 | |
| 20.8 mm | 0.818" | 65.2 mm | 2.569" | 11 1/4 | W | 25 |
| 21 mm | 0.826" | 65.9 mm | 2.594" | 11 1/2 | W 1/2 | 26 |
| 21.2 mm | 0.834" | 66.5 mm | 2.619" | 11 3/4 | X | |
| 21.4 mm | 0.842" | 67.2 mm | 2.644" | 12 | X 1/2 | 27 |
| 21.6 mm | 0.85" | 67.8 mm | 2.669" | 12 1/4 | Y | 28 |
| 21.8 mm | 0.858" | 68.4 mm | 2.694" | 12 1/2 | Y 1/2 | |
| 22 mm | 0.866" | 69.1 mm | 2.719" | 12 3/4 | Z | 29 |
| 22.2 mm | 0.874" | 69.7 mm | 2.744" | 13 | Z 1/2 | |
| 22.4 mm | 0.882" | 70.3 mm | 2.769" | 13 1/4 | Z1 | 30 |
| 22.6 mm | 0.89" | 71 mm | 2.795" | 13 1/2 | 31 | |
| 22.8 mm | 0.898" | 71.6 mm | 2.82" | 13 3/4 | Z2 | |
| 23 mm | 0.906" | 72.3 mm | 2.845" | 14 | 32 | |
| 23.2 mm | 0.914" | 72.9 mm | 2.87" | 14 1/4 | Z3 | 33 |
| 23.4 mm | 0.922" | 73.5 mm | 2.895" | 14 1/2 | ||
| 23.6 mm | 0.93" | 74.2 mm | 2.92" | 14 3/4 | Z4 | 34 |
| 23.8 mm | 0.938" | 74.8 mm | 2.945" | 15 | 35 | |
| 24 mm | 0.946" | 75.4 mm | 2.97" | 15 1/4 | ||
| 24.2 mm | 0.954" | 76.1 mm | 2.996" | 15 1/2 | 36 | |
| 24.4 mm | 0.962" | 76.7 mm | 3.021" | 15 3/4 | 37 | |
| 24.6 mm | 0.97" | 77.4 mm | 3.046" | 16 | ||