To determine the size of your finger, you can :

1. have your finger measured by a jeweller with a "ring tool" (a chain of rings with different sizes that the jeweller try on your finger to find the right size).

2. measure or estimate yourself the inner diameter of a ring that fits you. To help you, you can see below some rings with the finger size and the inner diameter. Print thispage and check that measures correspond (10 cm on the screen = 10 cm on the printed page). Then put a ring that fits you on the printed page and when the inner diameter of your ring fits with the inner diameter on the printed page, it means that you have found your finger size.