Use a flexible tape measure, such as a paper one, or a dressmakers tape measure. Don’t try to use a metal one.
How To Measure Your Head
When you fill out the order form, you'll be asked to fill in your head measurement.
Go around the fullest part of your head, just above the brow. Try it more than once, just to be sure. Don’t worry if you still have hair–it won’t make enough of a difference. Just pull the tape measure taught.
Tip: A typical adult head size is about 21″ to 22-1/2″. If you are getting a measurement outside of that, just double check it.