Measure your finger at the end of the day
Make sure your hands are warm
Use a flexible measuring tape, string, or paper strip
Wrap it snugly around the base of your finger
Mark where the ends meet
Measure the length in millimeters
Compare the measurement to a ring size chart
Measure the same finger more than once
Measure the exact finger you will wear the ring on
Consider the ring width when choosing a size
If between sizes, choose the larger size
For best accuracy, get sized by a jeweler