HazeGray... Welcome! 9 years subs here. Following is a formula that might help. One problem is that thickness of the bracelet affects the circumference it will go around. You need to measure the wrist and actually tie an inch or so of a "test bracelet" to measure how thick it will turn out. Then apply to this formula:Not bad for the first ones. My biggest problem right now is getting the size right. It's either too small or too big.