Determining your ring size by using the circumference of your finger is a straightforward and practical method. With just a measuring tape or a piece of string, you can accurately find the size that will ensure a perfect fit for your ring. Here's a simple guide on how to measure your ring size using circumference:

1. Get a measuring tape or a piece of string: Start by grabbing a flexible measuring tape or a piece of string that is long enough to wrap around your finger comfortably.
2. Wrap the tape or string around your finger: Gently wrap the measuring tape or string around the base of your finger, where you intend to wear the ring. Make sure it is snug but not too tight, allowing for a comfortable fit.
3. Mark the point of overlap: Once you have the tape or string wrapped around your finger, use a pen or marker to mark the point where the tape or string overlaps.
4. Measure the length: Carefully remove the tape or string from your finger and lay it flat on a ruler. Measure the length from the end to the marked point. This measurement (in millimeters) represents the circumference of your finger.
5. Determine your ring size: Refer to below a ring size conversion chart below chart to find out what size fits you.