How to Measure Your Head for a Hat That Fits

Quick answer

Wrap a soft measuring tape around your head about half an inch above your ears and across the middle of your forehead, then read the number in inches or centimeters and match it to the brand's hat size chart. Measure twice, keep the tape snug but not tight, and write the number down before you shop. If your measurement falls between two sizes, choose the larger size for woven caps and the smaller size for stretchy knit beanies.

A hat that fits should stay put when you look down, feel snug without pinching, and leave no red line across your forehead after an hour. Most bad hat purchases come down to one thing: guessing a size instead of measuring. The fix takes about two minutes and a soft tape measure.

This guide walks through measuring your head, reading a hat size chart, and applying those numbers to the headwear you actually buy. It also covers what to do when a measurement lands between sizes, since that is where most fit problems start.

What you need before you measure

A flexible cloth or vinyl tape measure gives the most accurate result. If you only have a stiff metal tape or a ruler, use a piece of string or a charging cable instead: wrap it around your head, mark where the ends meet, then lay it flat against a ruler. That transfer step adds a small margin of error, so measure twice and average the two numbers.

You do not need a mirror, but you do need your hair the way you normally wear it. A ponytail, braids, or a thick bun adds circumference, and a hat sized on flat hair will feel tight on game day. If you sometimes wear your hair up and sometimes down, measure with it up so the hat works in both cases.

• Soft tape measure, or string plus a ruler
• Hair styled the way you wear it most often
• A pen and paper, or your phone's notes app, to record the number

Where exactly to place the tape

Start at the middle of your forehead, about half an inch above your eyebrows, and run the tape around your head so it passes over the tops of your ears and around the widest part of the back of your skull. That path is the circumference a hat has to clear. If the tape dips below your ears or sits on your eyebrows, the number will come out too small.

Keep the tape level all the way around. A tape that rides up at the back gives you a smaller measurement than your head actually is, which is a common reason a new cap feels tight at the front and loose at the back. Check the height of the tape on both sides before you read the number.

• Common mistake: measuring over a thick hairstyle you only wear occasionally
• Checkpoint: the tape should touch your head all the way around with no gaps and no indentation

How tight should the tape be

Snug, not tight. You want the tape to sit against your head without compressing your hair or leaving a mark. If you can slide a finger under the tape easily, it is too loose; if it digs in, it is too tight and will give you a measurement smaller than your real size. Breathe normally while you measure, since holding your breath changes nothing but does make people rush.

Read the number where the tape meets its own starting point. Write down both inches and centimeters if your tape shows both, because different brands publish their hat size chart in different units. Round to the nearest quarter inch or half centimeter rather than trying to be more precise than the tape allows.

• Common mistake: pulling the tape tight because it feels more secure
• Checkpoint: no red mark or dent in your hair when you remove the tape

Reading a hat size chart without guessing

Most hat size charts list a range, such as 22 to 22.5 inches, next to a size label like medium. Match your measurement to the range it falls inside, not to the size name you wore in a different brand. Sizing labels are not standardized across manufacturers, so the number matters more than the letter.

When your measurement sits right on the boundary between two sizes, the material decides. Woven and structured caps have little give, so size up. Knit beanies and stretchy fabrics relax with wear, so size down if you want a close fit, or stay at the larger size if you prefer a slouchy look. Adjustable hats sidestep the problem entirely because the strap covers a range of sizes.

• Note whether the chart uses inches or centimeters before comparing
• For adjustable hats, check the stated adjustment range rather than a single size

Checking the fit once the hat arrives

Put the hat on and look down at your feet. If it slides forward or you have to hold it, it is too big. Next, press two fingers against your temples: if you feel steady pressure but no throbbing, that is a normal snug fit. A hat that leaves a red band across your forehead after fifteen minutes is too small, and no amount of wearing it in will fix a structured cap that is a full size off.

Knit beanies will relax slightly after a few wears, so a beanie that feels just barely tight on day one often settles into a comfortable fit. Woven caps and structured hats do not stretch the same way, so judge those on the first wear. If a hat is only slightly loose, a strip of felt or foam tucked inside the sweatband can close the gap.

• Common mistake: judging a knit beanie by its first-wear tightness
• Checkpoint: the hat stays put when you look down and turn your head

Your four-step head measuring routine

1. Step 1: Prep your hair and your tape: Style your hair the way you wear it most often and grab a soft tape measure, or a string plus a ruler if that is what you have. Checkpoint: if you are using string, measure it against a ruler twice to confirm the same number.
2. Step 2: Wrap the tape at the right height: Run the tape around your head about half an inch above your eyebrows, over the tops of your ears, and around the widest part of the back of your skull. Common mistake: letting the tape ride up at the back, which shrinks your measurement.
3. Step 3: Read the number at the right tension: Keep the tape snug but not tight, breathe normally, and note the measurement in both inches and centimeters if your tape shows both. Checkpoint: no mark on your forehead or dent in your hair after you remove the tape.
4. Step 4: Match it to the chart and decide on boundaries: Compare your number to the brand's hat size chart, and if you land between two sizes, size up for structured caps and down for stretchy knits. Next step: write the number and the size you chose in a notes app so the next purchase takes seconds.

Headwear and gear that pairs with a good fit

• Critical Role 10 Year Anniversary Mighty Nein Poster: Printed on McCoy silk cover stock and designed to connect seamlessly with the Vox Machina and Bells Hells 10 Year Anniversary posters. If you are setting up a display wall for your Critical Role collection, knowing the posters are designed to hang together helps you plan the layout before you buy.
• Critical Role Watercolor Logo Journal: Hardcover journal with a debossed watercolor logo, a light blue ribbon marker, an elastic closure band, watercolor endpapers, and an expandable back pocket. Handy for jotting down your head measurement, hat size chart notes, and the sizes that worked for each brand so you stop re-measuring every time.
• Fjord Stone & Jester Lavorre Ties-the-Knot Knit Scarf: A limited run product made for the Critical Role Ties-the-Knot Pop-Up Shop in NYC held in October 2025, with domestic US shipping only and no worldwide shipping. A knit scarf sits right at the neck and jawline, so if you wear one with a hat, size the hat on a day when you are also wearing the scarf to avoid a tight combination.

Measure once, write it down, and you will stop guessing at headwear sizes. Keep your number handy for the next hat purchase, and when a measurement lands between two sizes, let the material make the call: structured caps size up, stretchy knits size down.