Go to a Jeweler: The most accurate ring sizing will be done by a professional. Therefore visiting a local jeweler is the best option.

Do it Yourself: Wrap a thin strip of paper or a piece of string around the finger you want to measure. With a pen, mark the point on the paper or string where it overlaps. Measure the length of the paper or string using a flat ruler, from the starting point to the pen mark. Then find the matching size in the chart below.

Tips: Don't measure cold fingers. Cold makes your fingers shrink. The best time to take your measurements is at the end of the day, when your fingers have expanded the most. Measure on two different occasions to ensure accuracy.

If You are Buying a Ring as a Surprise: Borrow one of your partner's rings and slide it down a tapered candle. Measure the circumference of the candle where the ring stops. Use the chart below to determine the ring size.