There are two ways to measure.
- The String Test
You can measure his/her finger with a strip of paper or string. Start by cutting out a strip of paper. Wrap the paper around the base of the intended finger, and then mark where the paper overlaps. The length of the paper you measured in millimeters is the circumference of his/her finger. If the size of his/her finger below the knuckle drastically differs in size from the knuckle itself, measure his/he knuckle as well and choose a size that falls more in the middle of these two measurements.
- The Secret Test
Download the finger size checker HERE and print out in actual size ratio. You must double check the accuracy by using a ruler to make sure the actual size on the print out is correct.
Find a ring that he/she one currently wears and make sure he/she wears that ring on the ¬finger you are making for. Place it over the finger size checker until you find one that matches the INSIDE edge of the ring.