Wrap a strip of paper, string, or floss around the base of your finger
Mark where the ends meet
Measure the length with a ruler in millimeters
Compare the measurement to a ring size chart
Repeat the measurement 2 to 3 times for accuracy
Measure at the end of the day when your fingers are largest
Measure the exact finger you will wear the ring on
Make sure the strip fits snugly but not tightly
Use a ring you already own and measure its inside diameter
Match the inside diameter to a ring size chart
Check your size in both warm and cold conditions if possible
If between sizes, choose the larger size