To find your bracelet size, just add your wrist size to the sizes below depending on what fit you like the best.
Tight fit: Add 0.635 – 1.27cm
Comfortable fit: Add 1.905 – 2.54 cm
Loose fit: Add 3.175cm.
I have written a post on how to measure your wrist to get the best fit for your bracelet on my blog.