Use a ring sizer
Visit a jeweler
Measure an existing ring
Wrap a strip of paper around the finger
Mark where the paper overlaps
Measure the paper length in millimeters
Compare the measurement to a ring size chart
Measure the finger at the end of the day
Measure when hands are warm
Measure the knuckle if it is larger than the finger base
Choose a size that slides over the knuckle comfortably
Measure the intended finger
Measure more than once for accuracy
Avoid measuring cold fingers
Avoid measuring swollen fingers
Use the correct country’s ring size chart