I think I will find this to be very useful.
Link also has tabs for Necklace Size Chart, and Ear Gauge Size Chart
|Women(adult) Bracelet Size Chart
Men(adult) Bracelet Size Chart
Children Bracelet Size Chart
|How to measure and determine your correct bracelet size1. Measure your wrist with a flexible tape measurements or a thin strip of paper just below the wrist bone(below the bone is after your wrist bone, towards your hands). Wrap the tape or paper around the cuff of your wrist.
2. Get the circumference of the wrist. If you are using a strip of paper, mark the spot where the paper meets the other end. Measure the distance bwtween the spot with a ruler.
3. Add add one-half inch to the measurement for babies and toddlers and add one inch for teens and adults.Compare your measurement with the charts above to determine your bracelet size.