Step 1: Cut a strip of paper with a width of no more than 1 cm, and the edge should be flat to reduce the measurement error. Step 2: Wrap the paper around your finger, keeping it as close to your finger as possible. Step 3: Mark the overlap with a pen. Step 4: Use a ruler to measure the distance from the beginning of the note to the mark. Step 5: Get the ring number according to the ring size table.