The easiest way to know the ring size of a loved one or ours is by finding a ring that currently fits and wear.
Step 1. Find an existing ring that you or your loved one currently wears.
Step 2. Get a ruler in mm and measure the internal diameter of the ring (pst. make sure it's millimeters).
Step 3. Once you know how many millimeters, use the chart below to find the closest number.
Compare the internal distance of the ring with this chart, and the closest number will be the ring size that you are looking for. If the numbers look completely different, there's a chance that you might be using a ruler with a different metric (centimeters or inches).