How to Measure Your Head for the Perfect Hat Fit
Use simple tools you already have at home—like dental floss, a ruler, or a tape measure—to get your exact head size in just seconds.
Already Know Your Hat Size?
If you already know your hat size—such as 7 ¼—you can skip measuring.
Hat sizes are based on a math conversion from your head circumference.
Just use the size chart below to find the matching head circumference.
Traditional hat sizes come from a simple formula:
Head circumference ÷ π (3.14) = hat size.
If you know your numeric hat size, you already know your measurement.
How to Measure Your Head (3 Easy Steps)
Measuring your head is quick, simple, and helps ensure the hat you pick fits comfortably.
You only need one of these:
- Dental floss (best as a non-stretch “string”)
- A non-stretch string or thin cord
- A ruler or a retractable tape measure to measure the string
Step 1 — Wrap the String and Tie a Secure Knot
Wrap the floss or string around your head where your hat will sit—just above your eyebrows, above your ears, and around the widest part of your head.
Keep the string level all the way around.
Once you have the string in place, tie a square knot to hold your true head size securely.
A square knot helps keep the loop from shifting or loosening.
Tie the first knot.
Place a finger on the knot to prevent it from sliding while you tie the second half of the square knot.
It may help to have someone assist you.
As you tighten, slide your finger out so the knot sets at the correct size.
This tied loop represents the exact size of your head.
For slick strings such as dental floss, tie one or two extra knots on top to prevent the loop from loosening or shifting.
Step 2 — Remove the String
Carefully slide the tied loop off your head, keeping the knot tight so the size doesn’t change.
This loop now represents your exact head measurement.
Step 3 — Measure the String
Fold the tied loop in half. Lay the doubled string against a ruler or a retractable tape measure (just like shown in the photos).
Measure from the fold to the knot.
Double that number—this gives you your full head circumference.
Now you can match your measurement to the size chart below.
Traditional hat sizes come from a simple formula:
Head circumference ÷ π (3.14) = hat size.
If you know your numeric hat size, you already know your measurement.
Between Sizes? Here’s What to Do.
If your measurement falls between two sizes:
- Prefer a looser fit? Choose the larger size.
- Prefer a snugger fit? Choose the smaller size.
- For stretch-only styles
(beanies, cool weather military patrol caps, newsboys, slouchy beanies, headbands):
These are made in 1″ size increments. Choose the size closest to your head measurement.
They rely on the stretch in the fabric for a small amount of give. - For elastic-all-around styles
(welding caps, skull caps):
Select the size closest to your measurement. The elastic gives a bit of stretch and staying power,
but it will not make up for choosing a size too large or too small. - For adjustable-back styles
(ivy caps with slider buckle; fisherman caps with Velcro; warm-weather military patrol caps with Velcro;
boonie and bucket hats with Velcro; visors with D-ring):
These styles are offered in size ranges, not single exact sizes.
Choose the closest base size, then fine-tune your fit using the adjuster for 1–2 inches of flexibility.
while others are built as 2″ size ranges because of their adjustable backs.
Always select the size closest to your measurement—then use the natural stretch or the adjuster to get your exact fit.
Still Unsure About Your Size?
I’ve fitted thousands of people at shows.
If you’re uncertain which size or style is right for you, I’m here to help.
Just send:
- Your head measurement
- The style you’re interested in
I’ll review your details and recommend the best size with confidence.
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