A correct size must fit your finger comfortably: snug enough so that it won't fall off easily, but loose enough to slide over your knuckle to take it off. Finger size will change depending on different times of the day and the cold or warm weather etc. For better results:

1. Measure your finger at a later time of the day and when your fingers are warm. (fingers are swelling a bit at the end of the day and when warm.)2. Measure your finger size 3 to 4 times to make sure the correct reading.3. Avoid using string or paper to measure your finger, as these materials will easily stretch or twist, generating an inaccurate measurement.