-
Cut a string that is about 6 inches long.
-
Fold the string around the base of the finger, just below the knuckle.
-
Mark where the string ends with the pen.
-
Place the measured string on the ruler with the area marked on your right.
-
The number closest to the pen mark is the circumference of the ring in millimeters.
Or if you have a ring that already fits your finger well, you can use a ruler to measure the inside diameter of this ring. Just take your ruler and measure straight across the inside of the ring from edge to edge.
