Prepare Necessary Materials: Make sure you have a flexible tape measure or strip of paper, a pen, and scissors ready.

Choose the Finger: Decide which finger you want to measure for the ring. Note that finger sizes can vary on both hands. Typically, the ring finger is the fourth finger on the dominant hand, but it may vary individually.

Use a Strip of Paper: Cut a narrow strip of paper. Wrap the paper strip around the base of the finger and mark where the ends overlap. Then, use a ruler to measure the distance between the mark and the edge of the paper strip. This distance corresponds to the circumference of the finger.

Conversion to Ring Size: Once you have determined the circumference of the finger, you can use a ring size chart to determine the corresponding ring size. These charts are available online and provide the appropriate ring size based on the measured circumference.

Check the Size: After obtaining a ring size from the chart, you can use an existing ring size to verify the accuracy. Compare the measured ring size with an existing ring that fits the finger you are measuring.

Verification and Adjustment: If you have doubts or uncertainties, you may also visit a jeweler to have your ring size professionally measured. You may also consider taking multiple measurements at different times of the day to ensure you get an accurate size.

By following these steps, you should be able to determine your ring size independently. It's important to measure accurately to ensure the ring fits comfortably and is not too loose or too tight.