Your ring should fit your finger comfortably; it should of course be snug enough so that it will not fall off, but loose enough to slide over your knuckle.

 

Please note: Your finger size can change throughout the day, so it is a good idea to measure at the end of the day when your fingers are at their largest. Do not measure when your hands are cold; your fingers will be at least half a size smaller.

Step 1: Cut a piece of string to about 2 inches in length. If you don't have string, cut out a strip of paper about 1/4-inch wide and 2 inches long.

Step 2: Wrap the piece of string or paper around the base of your ring finger. Wrap around both the base of your finger and your knuckle if your knuckle is noticeably larger than the base ofyour finger.

Step 3: Mark the string or paper at the exact point that it overlaps to form a complete circle around your finger. Do this for where it overlaps on your knuckle as well, if you needed to measure it.

Step 4: Unroll the string or paper and place it against a ruler that is divided in millimeters. The starting end of the string or paper (the end you first put against your finger) must be at the base of the ruler and marked 0. The point at which the mark on your string or paper meets the ruler is the circumference of your ring finger. If you needed two marks because of your knuckle, make a new mark exactly between the two and use that mark as your measure.

Step 5: Refer to a ring chart to get your ring size (see Chart A). For example, if the inside circumference measures 57.6 mm, your ring size is a 17 (Korea Size).