When you’re not looking for an adjustable ring, you’ll need to figure out the appropriate size of your thumb.
Fortunately, the process takes a few minutes and requires a couple of household items. You’ll need a ruler with millimeters and a piece of dental floss to get an accurate measurement for your ring size.
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First, you’ll want to cut a four to five-inch long piece of dental floss and wrap it around your thumb. Make sure the floss is placed at the section of your thumb where it’s the widest, as this is where your ring will sit. Once the floss is wrapped, hold where the two ends meet with your other hand and remove the floss.
Using your ruler, measure the dental floss from the end to where your fingers are holding it in place. This length is the width of your thumb that you’ll then use to find your size. You’ll need the length in millimeters and then use a thumb ring sizing guide to find your true size.