Bracelet sizes are listed as circumference in cm. To measure your wrist use a piece of string or paper to wrap around your wrist, cut where it joins and measure against a ruler in cm. Compare to CRAFTD sizing options available.
In between sizes? Always opt for the larger size.
Beaded and leather bracelets:
Some bracelets are 'one size fits all' - these are designed to fit all wrists from 18cm - 24cm.