The average men's bracelet size is 8 inches.
MEASURING YOUR WRIST FOR AN ACCURATE BRACELET SIZE
To find your perfect bracelet size, follow these steps:
STEP 1: Measure your wrist with a flexible tape measurements or a strip of paper just below the wrist bone, where you would normally wear the bracelet.
STEP 2: If you are using a plain strip of paper, mark your size with a pen or pencil then use a ruler to measure the length. That would be your wrist size.
STEP 3: To find your bracelet size, just add your wrist size with the appropriate measurements below.
STEP 4: Select the appropriate bracelet size that corresponds with your measurements.
Visit the wiki page for more help: https://www.wikihow.com/Measure-Wrist-Size