Ring Size Converter

Finding the right ring size can be tricky, especially when different countries use different sizing systems. Our Ring Size Converter is here to help.

Whether you’re shopping for a ring overseas or converting your existing ring size to another country’s system, this tool makes it easy to get accurate conversions. Simply select your base measurement system, enter your ring size, and convert it to the desired system.

Ring Size Conversion Guide

Choosing the correct ring size can be confusing since different countries use different measurement systems.
Below you’ll find a practical comparison table to help you convert between US/Canada, UK, EU, and Japan ring sizes.

How to Use This Table

1. Find your known size in your country’s column.
2. Read across to see the equivalent size in other systems.
3. Keep in mind that minor variations may exist between manufacturers.

Ring Size Comparison Table

A Brief Note About Ring Sizing Systems

• •US (US/Canada): Uses numerical sizes, typically ranging from 1 to 12 for women’s rings and up to 16 for men’s.
• •UK: Uses alphabetical sizing (A–Z), with half sizes (like M½) sometimes used for precision.
• •EU: Uses the circumference in millimeters — a size 50 ring means the inner circumference is 50 mm.
• •JP (Japan): Also numerical but starts around size 1 for very small rings; most adult sizes range from 7 to 21.

Quick Tip for Measuring Your Size

If you don’t know your current ring size:

• •Wrap a thin strip of paper or string around the base of your finger.
• •Mark where it overlaps, then measure the length in millimeters.
• •Use the EU column as a guide to find the closest size.

Disclaimer

This table provides approximate conversions.
For engagement or wedding rings, always confirm your final size with a local jeweler for the most accurate fit.