How Hat Sizes Work

One of the problems with ordering hats online (or any clothing for that matter) is knowing what size to order. So you’ve found just the hat you have been looking for, but you have no idea what size to order. One option is to go to your closet and find out what size your other hats are. But what if you don’t have another hat to compare it to? Or what if your various hats aren’t all the same size? Or one is based off American Hat sizing, another European (metric), and another just says, “M”, for medium?  You might think that hat sizing is completely random or arbitrary, but I thought I’d break it down for you. So that no matter what sizing system you are ordering from, you should be able to order just the right size the first time.

We will start with the easy one: European (why is it we American’s are so attached to the Standard Unit system?). With European, all you need to do is measure the circumference of your head in centimeters. Or measure your head in inches, then multiply it by 2.54. You can use a tape measure, or us a string, then measure the length of the string. That’s the size you will want to order. Make sure you measure exactly where you will be wearing the hat. A rule of thumb is 1/8″ above your ear, but again, measure the spot you will wear the hat. Make sure the tape measure is held snug, but not too tight.

Now American Hat sizing is based off making a measurement of your head in inches, then turning the odd oval shape into a circle and taking the diameter of that circle. Now, that sounds really complicated, but the simple way to figure out your head size in American Hat sizingis to measure your head in inches, then divide by 3.14, or pi. For instance: my head measures to 23 3/16 (23.19 in decimal form). Divided by 3.14 and I get 7.38. American Hat sizes come in 1/8 increments. So a little trial and error math leads me to 7 3/8 as my American hat size (taking a look at my favorite baseball cap confirms that this is my size).

Now I know that’s a lot of work. So I’ve put together a good lookin’ chart for you guys to save you the effort. Enjoy!


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