Great question! Here's what we recommend:
While personal preference is your best guide, we’ve found a comfortable fit for a toggle bracelet to be about 1.5” longer than your wrist measurement. In order to measure your wrist, use a flexible measuring tape and measure around your wrist just below the bone. Add 1.5” to that length.
If your final length ends with a quarter size, order the next size down and let us know in the special instructions box the actual size you’d like.