Find a piece of strip or string of paper. Wrap it around the base of your finger. Use a pen to mark the point of the string/paper where it overlaps, forming a complete circle. With a ruler, measure the length in centimeters from the starting end of the string/paper to the pen mark. You can find here our ring size conversion chart. A note on all adjustable rings : do not hesitate to gently stretch the sides of your ring to give it the size that suits you.