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Ring Size & Finger Circumference Converter

Convert finger circumference or diameter into US, UK, and EU ring sizes.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Converts inner circumference measurements directly into standard jewelry ring sizes.

How to use it (step by step)

  1. 1Fill in the boxes: “Finger Circumference (mm)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Unit conversion
Changing a value from one measurement to another, like kilometers to miles. The amount stays the same; only the unit changes.

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