Here are a few tips for getting the best measurement:

• Always measure the finger at the end of the day when the finger is at it's largest.
• Do not measure the finger when hands are cold. Fingers are smaller when cold.
• Whole sizes closest to the exact size usually work very well.  

Most rings are in whole sizes only. Some rings can be sized by a jeweler after the purchase. However, not all rings can be sized due to the design, pattern or other factors. For example, a continuous pattern all the way around a ring usually can not be sized without some effect on the design. 

To determine the size of an existing ring, slide the ring down a tapered candle. Using a string or strip of paper measure around the candle where the ring stops. Mark with a pen at the point where the string/paper overlaps. Measure that length from the starting end to the pen mark in millimeters (mm) (on most rulers) and use the chart below to determine the ring size. Also this techique may be used to measure your finger for ring size. Or, use the ring sizer below.