To know the size of your ring, just measure your finger with a tape measure or even a string.
If you don't have a tape measure, you will measure it with a wire and then stretch it over a ruler to find out the circumference of your finger.
With the circumference measurement you will know the measurement of the ring.
With the circumference measurement, find the size of your ring in the table below.
If you already have a ring and want to know its size, you must measure the inner diameter of the ring.