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Ring Size Conversion

Ring Size Conversion
USA size Diam. inch. Diam. mm Circum. mm

British French German Japanese Swiss

Select a ring size in one category, the rest will change to match.

How to determine your ring size

  1. Wrap a piece of string or a strip of paper around your finger.
  2. Mark the point where the two ends meet.
  3. Measure the string or paper against a ruler to get the circumference of your finger.
  4. Divide that by 3.14 to get the diameter of your finger.
  5. Look up your ring size using the form above.