At Ritzin, we have all guides through which you can measure the ring size without stressing yourself and surfing through the internet. See below the guide and the size chart which will help you find your size.
Take a strip of paper, cut it long enough that it can fit around your finger.
Wrap the strip around your finger, that is not tight nor loose but comfortable.
Mark a line with a pen, where the end meet,
Measure the length of the paper from tip to pencil mark.