1. Find a ring that fits you perfectly

Make sure it's one you wear on the same finger where you want the new ring.

2. Place the ring on a flat surface

It can be a table or any place where it won't move.

3. Take a ruler. The ruler must have millimeters (mm).

4. Measure the internal diameter. Align the “0” of the ruler with the inner edge of the ring.

Measure directly from one inner edge to the other inner edge, passing through the center.

5. Read the measurement in millimeters

Make sure the ruler is straight and at the height of the center of the ring so that the measurement is accurate.

6. Find the equivalent size in the size chart

With the inner diameter in mm you can easily compare it with any ring size chart.