Measuring your head is a simple process that can be broken down into three easy steps:
Circumference: wrap the tape measure around your head, starting at the hairline and continuing around the base of your head.
Front to Nape: start at the center of your forehead's hairline, then measure straight back over the center of your head until you reach your hairline’s end at the nape of the neck.
Ear to Ear: start about 1/4 of an inch above one ear, go across the top of your head, and stop at the same place above your other ear.