Lilly - Giovannio Collection

Hat Sizing Guide: Determine Your Hat Size

You’ve found the perfect hat style, now it’s time to make sure it fits like a glove. Hats in the Belfry’s handy hat sizing guide makes shopping for hats online simple with women’s hat sizing, men’s hat sizing and tips for measuring your head with our custom measuring tool. This guide will walk you through the general size guidelines, types of men’s and women’s hats sizes, measurement suggestions and tips for measuring your head when sizing for hats that are sold in numerical and alpha sizes. Before you place your hat order, be sure to bone up on hat fitting.

*We do not sell children's sizes

Women’s Hat Sizes

In general, women’s hats are sized in one size fits most sizes or OSFM. This means that the style is manufactured in a single size with the adaptability to suit various head sizes ranging from 21.5 inches to 22.25 inches in circumference.

With that being said, actual hat sizes vary from designer to designer, so some hats will fit a smaller or bigger head depending on the style. Thankfully, most of these styles will have an adjustable inner drawstring or band to keep the hat in place and offer flexibility in fit if it runs a little large. 

Men’s Hat Sizes

Men’s hats and caps are generally sized in types: numerical sizing and alpha sizing (small through extra large). In some cases, you may find men’s hats listed as OSFM, or one size fits most. These OSFM hats will generally fit heads with a circumference of 21.5 inches to 23 inches or a medium/large.

When you’re shopping for hats sized in alpha or numerical sizing, the first thing you’ll want to do is carefully measure your head following our measuring guide below. Once you’ve determined the circumference of your head, use our hat size chart to determine which size to order. 

Measuring Your Head

Determine hat size by using a flexible tape measure, or a string and ruler. You may also measure your head by printing out our handy custom measuring tool. Measure from the back of your head bringing the ends together at the center of your forehead right above your eyebrows. Use the hat size chart below to determine your size, rounding to the nearest eighth of an inch as necessary. It is important that you measure your head, even if you’ve found a great fit with a certain size in the past, as hat sizes do vary brand by brand. Remember, fitting your head isn’t an exact science or a guarantee of hat fit. View our convenient hat sizing guide for men and women for more information.

- Fitting your head isn't an exact science or a guarantee of fit. -

Returns & Exchanges from Hats in the Belfry

If you’ve mistakenly ordered the wrong size hat or discovered post-order that you’d prefer something else, reference our simple return policy. You can return or exchange any one of our hats if you let us know within 30 days of delivery. When we receive the return slip and the hat, we’ll typically process your return in 14 business days or less.

Still have questions? Call us at 1-888-999-HATS or send us an e-mail. We're more than happy to help and answer any of your sizing concerns!

Additional Helpful Information:

How To Clean A Hat

How To Reshape A Felt Hat

Style Guide: Caps Styles & How To Wear Them

Trilby vs. Fedora: What's The Difference 

How To Wear A Pork Pie Hat

How To Wear A Cloche Hat With Style