How to Measure your finger size easily?
use a pieces of thin strip paper or threads, wrap it around your finger, make sure the paper is below the joint of your finger and close to your knuckle, then mark the spot where the paper meets, and measure the distance with your ruler, use the ring size measurement and conversion chart to see which size you are. And you can also see the size measure in different countries standard.
see below size chart or go to the Heritage84 ring size measurement chart page. you can download the size conversion chart.