How to figure out your finger size
Buy yourself a finger sizer before you order a ring if you do not know your size.
All the little internet tricks like the string sizing or holding your finger up to the computer or device screen usually do not work. Then you have to keep sending it back for another size.
Just remember, if the sizer loops are smaller (in width) than the ring you are getting, it could be showing that you are just a little smaller than you are.