Take a measuring tape and measure your wrist at its smallest point. Take a true wrist measurement-not too tight or too loose. Then, add 1 inch to that measurement. Remember, the tag does not bend. So, you will need to add an inch to your wrist measurement. (This only applies to all bracelets unless you have a bracelet buddy to assist you to put it on and then it could be a little tighter at 1/2" large than your wrist - HOWEVER WE RECOMMEND 1" LARGER). Be sure to measure carefully as there is a $6 return shipping and handling fee to exchange the bracelet for a different size.