How to Measure Your Ring Size in the US System Ring Sizer Tool The most accurate way to determine your ring size is by using a ring sizer tool. These tools are available at jewelry stores or can be purchased online. Simply try on the rings to see which one fits best. Measuring Tape or String Method If you don’t have access to a ring sizer, you can use a flexible measuring tape or a piece of string. Wrap it around the base of your finger, mark the point where it overlaps, and measure the length with a ruler. Compare the measurement to a US ring size chart to find the correct size. Existing Ring Method If you have a ring that fits well, measure its inner diameter and compare it to a US ring size chart. Visit us https://www.ethicaladorn.com/pages/ring-size-guide