To determine the size of your ring, you can use the following baguier.
Each sphere corresponds to the inside diameter of the ring.
For the French size chart, the number in the center indicates your French ring size which is the same as the circumference of your finger in mm. Thus, you can easily find your equivalence in US size with the second table (the number inscribed at the center indicating this time your US ring size).
In order to correctly choose your ring, you can use a ring that you own and find the corresponding diameter on the ring (measure which is under the circle). So that the correspondence is perfect, the circle drawn on the ring should be visible inside the ring.
In case of hesitation between two sizes, we advise you to choose a size above.