Determining someone's correct ring size, by using a properly fitting ring or by measuring the finger in question, is important to ensure a perfectly fitted ring whether for yourself or a someone else.

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 or a ¼ inch wide piece of paper to about 2 inches in length. 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 of your finger.

STEP 2:

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

STEP 3:

Unroll the string or paper and place it against a ruler with millimeter measurements. The length of your measurement 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. Refer to the ring chart above to get your ring size.