Forehead to Nape
Start the tape from the center of the front of your hairline, to the hairline at the nape of the neck. If you have little or no hair, lay your index, third, and ring finger flat against your forehead just about at the brow bone. At the top of the three fingers would be a good straight point. Measure until about an inch below the small bone at the bottom of the skull.
Ear to Ear
Lay the end of the tape about a half inch above your little crease (where glasses rest) at the top of your ear between the ear and the head. Bring the tape across the top of your head to meet the other ear, without touching the ear, at the same point.
Start the tape at your hairline at the center of your forehead. Run the tape around, behind the ears, passing your hairline at the nape of the neck, and back up to the middle of your forehead.