1. Use tape measure, strip of paper, or length of string to wrap around the base of the finger you want to measure. Make sure it’s snug but not too tight. It should fit comfortably and slide over your knuckle.

2. Mark the point where the paper/string overlaps to form a complete circle around your finger.

3. Lay the paper/string flat and measure the distance from the start of the paper to the mark you made. Use a ruler to measure this length in millimeters (mm).

4. Use the chart below to convert the length from mm to your ring size.

1. Choose a ring that already fits your finger well.

2. Measure the interior diameter of the ring in millimeters (mm).

3. Use the chart below to convert the length from mm to your ring size.