Method 1: Finding the diameter of a different ring
-If you have a ring that you have already worn on the finger you want to wear the ring on, take it with you.
-Find a ruler with millimeter measurement.
-Place the ring horizontally on a flat surface and measure the inner diameter of the ring from end to end. Ignore the metal part of the ring when measuring and make sure you measure the widest part of the ring.
-Determine how many millimeters you measured from the ruler.
-The measurement corresponding to the diameter value in the table below is your ring size.
Method 2: Finding the measurement around your finger
-If you do not have a ring suitable for the finger you intend to wear, take a piece of wire, string or a strip of paper.
-Wrap this object around your finger, mark with a pencil where the two ends meet.
-Find a ruler with a millimeter measurement and measure the part of the object up to the point you marked.
-These values will give you the length of the circumference of your finger.
The measurement corresponding to the circumference value in the table below is your ring size.