There are three ways to measure your ring size. Depending on what is available to you, you'll be able to use one of the three methods:
You can measure your ring size using either string or, perhaps a more common item in your home, floss. Take one of these measurement tools and wrap it around the base of your finger, marking where the string or floss first overlaps with a pen. Then, line that up with a ruler and take down its length in millimeters.
After that, all you have to do is to compare your results with our Size guide chart below:
Requirements: A ring that fits you well,
a millimeter ruler for measurements
Use the ruler to measure the diameter of the inside of the ring, then look up the measurement on the chart below to find the corresponding ring size.