1. Take a piece of string or floss and tightly wrap it around the base of the finger where you plan to wear the ring

2. Mark the point where the floss or string overlaps with a pen to denote the circumference

3. Straighten out the floss or string and measure its length using a ruler or measuring tape, recording the measurement in millimetres

4. Use the chart on this page to convert the size in MM to US ring size