Ring Size Converter
International conversion between US, UK, Europe, and Japan sizing systems.
Understanding International Ring Sizes
Whether you're purchasing a gift or crafting a custom piece, finding the right fit is essential. Our ring size converter helps you translate measurements between the most common global systems, ensuring accuracy across US, UK, European, and Asian markets.
How to Measure Your Ring Size
There are two primary ways to determine your size at home:
- Diameter Method: Measure the inside distance across the center of a ring that already fits you perfectly. Use a digital caliper for the best results.
- Circumference Method: Wrap a piece of string or a thin strip of paper around the base of your finger. Mark the point where the ends meet and measure the length against a ruler in millimeters.
International Conversion Table
| Diameter (mm) | US & Canada | UK & Australia | EU (ISO) | Japan |
|---|---|---|---|---|
| 14.07 | 3 | F | 44 | 4 |
| 15.70 | 5 | J 1/2 | 49 | 9 |
| 17.35 | 7 | N 1/2 | 54 | 14 |
| 18.99 | 9 | R 1/2 | 59 | 18 |
Ergonomics for Jewelry Makers
Crafting jewelry involves fine motor skills and long hours spent at a jeweler's bench. To prevent chronic neck and back issues, ensure your Jeweler's Bench Height is adjusted so you aren't constantly hunching over your work. If you're designing digital 3D models of rings, maintaining the proper Monitor Distance is critical for precision. Additionally, high-quality task lighting is a must—refer to our Lighting Guide to optimize your workshop's visibility.