When measuring for bracelets, measure tightly where your wrist is broadest and add 2 cm or about 1 inch. This will allow enough slack to add beads and fill your bracelet. The smallest bracelet (14 cm) is very small and is intended for a child while the largest bracelet (24 cm) is extremely long.
Remember that the length shown when you order a bracelet is the total length of the bracelet once you have attached a lock, however locks are sold separately.
e.g. If a bracelet is 20 cm / 8 inches it means that it consists of a lock (2 cm / 1 inch) and a chain (18 cm / 7 inches).