1. The ring should fit your finger comfortably: snug enough so it won't fall off, but loose enough to slide over your knuckle with relative ease.

2. When the knuckle is bigger than the base of the finger, measure both places and pick a size in between the two.

3. Measure your ring size at the end of the day when your fingers are warm. Finger size changes depending on the time of day and the weather, and your fingers are actually smaller in the early morning and in cold weather. Also, keep in mind that fingers on your dominant hand are usually larger.

4. Measure 2 to 3 times for more accuracy.