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Ring Size Converter

convert ring sizes between different international sizing systems

select a size

What is Ring Size Converter?

Ring sizes are not the same everywhere. The United States, the United Kingdom and Europe each use a different numbering or lettering system, which makes buying a ring online tricky.

What this tool does

Lets you choose a US ring size and shows the matching UK letter size, EU size and inner diameter in millimetres.

How to use it

  1. Select your US ring size.
  2. Read the UK, EU and diameter values shown.
  3. Use them to choose the right size when ordering from another country.

Did you know?

  • Ring sizes are based on the inside size of the ring, either its diameter or its circumference.
  • Fingers change size with temperature and time of day, so measure at the end of the day when your hands are at a normal temperature.

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