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Ring Size Converter — Diameter, Circumference, US, UK, EU & HK | SizeMate

Compare ring size labels from an inside diameter or finger circumference measurement in millimeters.

Measure first, convert second, verify the brand chart

  1. Record the physical measurement in centimeters or millimeters
  2. Match only inside the published reference-table range
  3. Use the result as a fitting start, not a guarantee

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