Ring Size Information Use these steps to measure for ring size: 1. Print out this page. Be sure your printer is set to 100% (no reduction / enlargement) 2. Measure this chart and be sure it is 3 1/2 inches between the lines as shown. 3. Wrap a piece of lose string around your finger. Be sure to allow for the size of your knuckle. 4. With a pen, mark the point on the string where the end meets. 5. Match the string up with this chart to get your ring size. 6. You may also cut out this chart and wrap it around your finger. You may also compare your finger measurement with this chart to determine your ring size.