MM to Ring Size Calculator
Ring sizing can be confusing due to different measurement systems used across countries. Here’s a comprehensive table that converts millimeter (mm) measurements to various ring size standards, including UK, US, and EU sizes.
Ring Size Conversion Table
| Diameter (mm) | Circumference (mm) | UK Size | US Size | EU Size |
|---|---|---|---|---|
| 14.0 | 44.0 | E | 3 | 44 |
| 14.7 | 46.0 | G | 3¾ | 46 |
| 15.0 | 47.0 | H | 4 | 47 |
| 15.6 | 49.0 | I½ | 5 | 49 |
| 16.2 | 51.0 | K | 5¾ | 51 |
| 16.9 | 53.0 | M | 6¼ | 53 |
| 17.3 | 54.0 | N | 7 | 54 |
| 17.8 | 56.0 | O | 7½ | 56 |
| 18.2 | 57.0 | P | 8 | 57 |
| 18.6 | 58.0 | Q | 8½ | 58 |
| 19.1 | 60.0 | R½ | 9 | 60 |
| 19.8 | 62.0 | T | 10 | 62 |
| 20.6 | 64.0 | V | 10¾ | 64 |
| 21.0 | 66.0 | W | 11½ | 66 |
| 21.8 | 68.0 | X½ | 12½ | 68 |
| 22.3 | 70.0 | Z + 1 | 13 | 70 |
Key Points to Remember
- Measurement Methods: Ring sizes are typically determined by two measurements:
- Size Variations: Ring sizes can vary slightly between different jewelers and countries124.
- Half Sizes: Many sizing systems offer half sizes for a more precise fit2.
- Knuckle Consideration: If your knuckle is larger than average, you may need to choose a slightly larger size for comfort2.
- Wide Bands: For rings with wide bands, you might need to go up a size, as they tend to fit more snugly2.
- Temperature Effects: Your fingers can swell slightly in warm weather, so consider this when choosing a size4.
- Professional Sizing: For the most accurate sizing, it’s best to visit a professional jeweler who can measure your finger in person4.
By using this table and keeping these points in mind, you should be able to find the right ring size for any occasion or purchase. Remember that comfort is key, so when in doubt, it’s often better to choose a slightly larger size.