How to Measure the Size of a Ring

Measure precisely to determine ring size.
Measure precisely to determine ring size. (Image: Zedcor Wholly Owned/ Images)

A ring that is too loose or too tight is uncomfortable to wear or may be easily lost. With four different ring sizing systems in use worldwide, determining a ring’s actual size isn’t always straightforward. If you have a ring you want to sell, or if you want to buy one that fits as well as a ring you already have, take the time to measure carefully.

Things You'll Need

  • Ring
  • Paper
  • Ruler
  • Scissors
  • Felt-tip pen
  • Ring sizing chart

Cut a strip of paper 1/2 inch wide and 3-1/2 inches long with scissors.

Wrap the paper strip into a circle and place it on the inside of the ring. Let it unroll and adjust it until it fits snugly against the inner surface of the ring.

Make a mark with the felt-tip pen at the point where the paper overlaps itself.

Remove the paper strip from the ring and unwrap it. Lay it down on a flat surface.

Measure from the end of the paper to the mark. A measurement in millimeters will give you greater accuracy, but most ring size charts include measurements in inches as well.

Compare the measurement to a chart that classifies the ring size standards in your area.

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