When she takes it off, be prepared with a bar of soap (or even playdough if it’s more convenient) and press the ring into it to make a mold.In both cases, take note of a ring she loves to wear that appears to fit comfortably. If you are asking yourself how to measure ring size from a ring, there are 2 surefire ways to get her ring size without her knowing. Use the following chart to determine the ring size based on the length of the string:īy following these simple steps, you can accurately measure ring size in inches and ensure a perfect fit for your ring. Mark the point where the string overlaps and then measure the length of the string from the starting point to the marked point using a ruler. Make sure the string is snug but not too tight. Take the string and wrap it around the base of the finger where you will wear the ring. To measure ring size in inches, you will need a piece of string, a ruler, and the finger you want to measure. Measuring ring size in inches is a simple process that can be done at home with just a few materials.