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1. Take a string or strip of paper and wrap it around your finger.
    

2. With a pen, mark where the string and the end meet up.
    

3. Measure the string against a ruler and note the length in inches.
    

4. Find your result on the chart below:

If you are 2 3/16", then you are ring size 7. Note that the column "finger in inches" jumps by 2/16ths for each increase in size. Therefore, for half sizes, simply add or subtract 1/16th of an inch. For example, if you are 3" and cannot find your size on the chart, you are ring size 13 ½ (because 2 15/16" + 2/16" = 3 1/16").