There are different ways to easily and quickly determine the correct ring size. The first method is to measure your own ring, the second method is to measure your finger and the last most simplest method is to measure a ring size with a ring meter.
How to measure your own ring to determine your ring size.
Take a well-fitting ring and measure the diameter of the inside of your ring. This is your ring size.
For example: Size 18 corresponds with a diameter of 18 mm.
If you don’t have a well fitted ring to determine the ring size you can measure your finger for the correct size:
Measure your finger to determine your ring size.
Use a flexible measuring tape to measure the circumference of your finger. If you don’t have a measuring tape, use a piece of paper or string, no thicker than 0.5 mm, and then measure the length of the paper / string with a ruler. This is the circumference of your finger
Use the following ring size converter chart below to determine your ring size. Look at circumference mm. For more details click here