With a flexible tape measure, wrap measure just below the wrist bone. Be sure to not measure too tight or too loose. Take measurement. Then add an inch to this perimeter. For example, if the wrist is 5.75 inches, then the bracelet size is 6.75 inches (size small).

SMALL: 6.75" (17.1cm)
MEDIUM: 7.25" (18.4cm) - Standard Size
LARGE: 7.75" (19.7cm)
EXTRA LARGE: 8.25" (21cm)