This is a chart that will be extremely helpful for you to determine the ring size that you need. You can either make use of a tape or a small piece of string to measure the area that will be occupied by the ring. When it becomes a complete circle, make a mark on such string. This will be helpful for you to compare with the chart that is mentioned below.
|Inside Diameter||Inside Circumference||SIZE|
|MM||MM||US / Canada||UK / Australia / South Africa||France / Germany||Europe / Italy / Spain|
Just wrap the soft tape measure around the broadest part of your wrist and take note of the length. If you are using a plain strip of paper, mark your size with a pen or pencil then use a ruler to measure the length (The starting end of the paper must be at the base of the ruler and marked 0). That would be your wrist size.
Please make sure there's enough space to tuck in 2 fingers as this is the space you need to add the charms. If you want to add less than seven charms, add 2 centimeters are ok. If you plan to wear eight or more charms, please add 3 centimeters. If you purchase a bangle, just choose the next size from your actual wrist measurement.