1. Find a ring sizing conversion chart online. This will help you convert your measurement to the right ring size.
  2. Cut out a narrow strip of paper: The strip should be long enough to wrap around your finger.
  3. Wrap the paper around your knuckle: Place the paper strip around the knuckle right above where you want to wear the ring. The ring will need to be big enough to slide over the knuckle.
  4. Draw a line where the strip overlaps: Draw a line with the strip of paper that overlaps the end that's touching your finger.
  5. Unroll the paper and measure: Unroll the paper strip and measure the distance from the end to the marked line. Measure in centimeters or millimeters for the most accurate size.
  6. Compare your measurement to the size chart: For instance, a measurement of 67.2 millimeters corresponds to a ring size of 12 in the U.S.