In order to determine your ring size, print out this page and make sure that the "Fit to Page" or "Scale to Fit" options are not selected.

In case that you don't have a printer, please follow these steps:  

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.
   
   
6. The sizes currently appearing in the site are Japanese and US size.