Here are the steps to find out your ring size.
The first step if you don't have a ring

1- Get a piece of paper or string and cut a strip long enough to wrap around your finger.
2- Wrap the paper around your knuckle so that you press it firmly.
3- Draw a line where the two ends of the paper meet around your finger.
4- Measure the length of the paper to the mark you drew using the centimeters of the ruler.
5- Write the result in the product size box when ordering.
The second method if you have a ring

1- Your ring should be round and not crooked.
2- Using a ruler, measure from the middle of the inner diameter of the ring as shown in the red line.
3- Then mention the result in the product size box when ordering.