International Ring Size Conversion Chart
Ring sizing standards vary around the world, which can make ordering a ring from another country confusing. The United States, United Kingdom, Europe, and parts of Asia all use different measurement systems for ring sizes.
This international ring size conversion chart helps you compare ring sizes across regions so you can confidently choose the correct size when ordering from overseas.
| Circumference (mm) | Diameter (mm) | UK / EU / AU | US / Canada | CN / SG / JP | HK | Switzerland |
|---|---|---|---|---|---|---|
| 44.2 | 14.1 | F | 3 | 4 | 6 | 4 |
| 45.5 | 14.5 | G | 3.5 | 5 | 7.5 | 5.5 |
| 46.8 | 14.9 | H | 4 | 7 | 9 | 7 |
| 48.0 | 15.3 | I | 4.5 | 8 | 10 | 8 |
| 49.3 | 15.7 | J | 5 | 9 | 11 | 9 |
| 50.6 | 16.1 | K | 5.5 | 10 | 12 | 10 |
| 51.9 | 16.5 | L | 6 | 11 | 13 | 11.5 |
| 53.1 | 16.9 | M | 6.5 | 13 | 14.5 | 14 |
| 54.4 | 17.3 | N | 7 | 14 | 16 | 15.5 |
| 55.7 | 17.7 | O | 7.5 | 15 | 17 | 16.5 |
| 57.0 | 18.1 | P | 8 | 16 | 18 | 17.5 |
| 58.3 | 18.5 | Q | 8.5 | 17 | 19 | 19 |
| 59.5 | 19.0 | R | 9 | 18 | 20.5 | 20 |
| 60.8 | 19.4 | S | 9.5 | 19 | 22 | 21.5 |
| 62.1 | 19.8 | T | 10 | 20 | 23 | 22.5 |
| 63.4 | 20.2 | U | 10.5 | 22 | 24 | 23.5 |
| 64.6 | 20.6 | V | 11 | 23 | 25 | 25 |
| 65.9 | 21.0 | W | 11.5 | 24 | 26 | 26 |
| 67.2 | 21.4 | X | 12 | 25 | 27.75 | 27.5 |
| 68.5 | 21.8 | Y | 12.5 | 26 | 28.5 | 28.5 |
| 69.1 | 22.0 | Z | 13 | 27 | 29.5 | 29.5 |
How to Use an International Ring Size Chart
When ordering a ring internationally, the most important step is identifying which sizing system the seller uses. Most U.S. jewelers use U.S. ring sizes, while customers in the UK, Europe, Australia, and parts of Asia may be familiar with different standards.
To use the chart correctly, locate your current ring size in your local system, then follow the row across to find the equivalent size used by the seller. I got my original conversion chart from Blue Nile and use it daily.
Tips for Ordering Rings from Overseas
Ring sizes are conversions, not exact measurements — small variations can occur
Wider rings tend to fit tighter than narrow bands
If your size falls between two measurements, sizing up is usually recommended
Finger size can change slightly due to temperature and time of day
When possible, confirming size with a physical ring sizer can help avoid exchanges
We offer sizing rings to give you the confidenced needed to get the perfect fitting ring the first time.
Leave a comment