1, winding mode
(1) Take a red thread about 10 cm and put it around your finger to wear a ring. The tightness should be appropriate to ensure that the fingers can turn but will not fall off.
(2) Mark the two ends of the line first, then lay a red line, and measure the length between the marks with a ruler, which is the finger circumference. Then use the data to correspond to the ring size table to get the inner ring diameter of your ring.
2. Paper strip method
(1) Prepare a piece of A4 paper, a pen and a scale.
(2) Similar to the winding method, cut the prepared A4 paper into a long strip with a side length of about 1 cm, and wind it between the fingers to be measured, with moderate tightness.
(3) Mark the overlapping parts with a pen, then lay the paper flat on a horizontal plane, and then measure the distance between two points with a scale as the size of a finger.
Personally, I suggest measuring the finger size to avoid being too cold or too hot. People's fingers will expand and contract with the environment, so pay attention to the temperature when measuring. It is suggested that the average value of multiple measurements is more accurate.