Are there different scales for measuring men's and women's ring sizes?

The scale for measuring men's and women's ring sizes is the same. However, the most common sizes for men's rings tend to be larger than the most common women's ring sizes.

There are different scales for different countries, and they are measured based on circumference or diameter of the finger. In the United States, ring sizes start at 3 and go up in half-size increments. Ring size can be determined by measuring the finger with a flexible measure or by using a chart. These charts have circles representing different ring sizes, so a user can line a ring that fits with the appropriate circle to determine an unknown size.