Finding your ring size in mm
Using a measuring tape to find out the size of your finger, wrap the tape snugly around your finger. It is important to ensure it is snug as your finger can change in size throughout the day.
Using a pen or marker, mark on the tape where the end meets the snuggest part. Open the tape and you will see your measurement in millimeters. That will be the circumference of your finger. The conversion chart below will display your ring size.
