Keep your palms open, with your palm facing upwards. Pick up your tailor's tape and place the metal tip at the center of your wrist. Then, pull the tape tight over your wrist until it is comfortable. The tape should be aligned with the length of the tape closest to the metal tip. It may be more comfortable to go ahead and tie the tape in a loop, then move it around your wrist and then pull the tape down to the metal tip. Record this measurement in centimeters. For millimeters calculation, there are 10 millimeters in a centimeter. The measurement of your wrist in centimeters is 10 times the centimeters multiplied by the number millimeters over the centimeter you measured.
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