Hawaiian Bracelets sizing is measured in inches.  Take a soft measuring tape and measure the circumference of your very tightly clenched hand with your four fingers straight and your thumb turned in to touch your ring finger or pinky (this should make your hand the smallest possible). Please measure over the widest part of your hand tightly (knuckles and fist area) using inches. This would be your approximate size. Please remember that it is your hand that is to be accurately measured, and not your wrist as these bracelets are made normally without a clasp. Please note that it's very important to know your correct bracelet size before ordering. Sizing alterations are very costly once an item has been completed. If you have any further questions, please contact us at orders@rhhj.com.