Utility
Ring Size Converter
Privacy Verified
Convert ring sizes between US, UK and EU systems or find your size from a ring's inside diameter or finger circumference in mm.
Tip: measure an existing ring's inside diameter with a ruler, or wrap a strip of paper around your finger and measure the length in mm (that's the EU/ISO size). Sizes are matched to the nearest standard size.
Privacy & Security
Runs entirely in your browser. No data is sent to any server.
Data: None
Client-side-Side
Active
v1.0
How to Use
Pick what you know (US number, UK letter, EU circumference or diameter in mm) and enter the value to see all equivalent sizes.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.