The best way to find out is to go to a goldsmith and try on different bracelet lengths. If you have to measure it without a PANDORA bracelet, you can try measuring your wrist using a measuring tape. The bracelet must not be too tight, as there needs to be room for charms. It must not be too loose or it will slide over the back of your hand.  A good rule of thumb is that you should be able to put a finger between your wrist and the bracelet.