The most common ring size for women is size 6, while the most common ring size for men is size 9. The most common size range is sizes 5 to 8 for women and sizes 8 to 12 for men.
One easy method for measuring ring size is to use a ring sizer set, which is a collection of plastic or metal rings ranging from sizes 4 to 13 with half sizes in between each whole size. Using a ring sizer set, a person only has to try on each ring until a comfortable fit is determined.
Ring size can also be measured using a tape measure to find the circumference of the selected finger and then using that measurement to find the size equivalent on a reference chart.