The perfect bracelet fits loosely so it moves a little, but is not loose enough to slide off the hand. One or two fingers should be able to slide under the bracelet when worn.To measure your wrist:Use a tape measure or a strip of paper or ribbon. Wrap it around your wrist where you would normally wear a bracelet. If you are using a strip of paper or ribbon, mark the end of the strip and measure the length in centimetres. This is your wrist size. Add 1-2cm and this is your size.