Wrap a soft tape measure around your wrist, keeping it snug against the skin without being too tight. The length of this loop is your wrist circumference, and there’s no need to leave extra space on your own.
1.2 Paper strip measurement
Wrap a piece of string around your wrist, keeping it neither too loose nor too tight against the skin. Make a mark at the intersection. Then measure the length of the string or the paper strip using a ruler.