MEASURE YOU FINGER
Take either a length of string or floss and wrap around your finger. At the place where it overlaps, mark the point with a pen.
Unwrap it and lie it flat beside a ruler or measuring tape. Measure circumference of your finger in inches or mm.
Enter the resulting value below in the field.
Make sure you don't pull the thread or string too tightly, as it can be stretchy and then it may seem that you need a bigger ring size than you actually require.
Enter the result in millimeters / inches