What hat size do you wear? Enter your head circumference below in inches or centimeters.
The calculator converts your measurement to your US, UK, and EU hat size so you can quickly find the right size.
Hat Size Calculator
Enter your head circumference to find your US, UK, and EU hat size.
How to Measure Your Head for a Hat Size
To measure your head for a hat size, take a soft measuring tape and wrap it around your head where the hat will sit, just above your eyebrows and ears. Keep the tape level all the way around your head and make sure it feels snug, but not tight.
Where the tape meets is your head measurement. Write it down in inches or centimeters. If you don't have a measuring tape, you can use a piece of string and then measure the string with a ruler.
It's a good idea to measure your head a couple of times to make sure you get the same result. Once you have your number, enter it into the hat measurement calculator above to find your US, UK, and EU hat size.
For a more detailed step-by-step explanation, see our how to measure your head for a hat size guide.
Hat Size Conversion Chart (US, UK, & Metric)
Once you have your measurement, use the chart below to find the closest US, UK, EU, and alpha hat size.
| Inches | EU Hat Size | US Hat Size | UK Hat Size | Alpha Size |
|---|---|---|---|---|
| 20 ¼ | 51 | 6 ⅜ | 6 ¼ | XS |
| 20 ⅝ | 52 | 6 ½ | 6 ⅜ | XS |
| 21 | 53 | 6 ⅝ | 6 ½ | XS |
| 21 ½ | 54 | 6 ¾ | 6 ⅝ | S |
| 21 ⅞ | 55 | 6 ⅞ | 6 ¾ | S |
| 22 ¼ | 56 | 7 | 6 ⅞ | M |
| 22 ⅝ | 57 | 7 ⅛ | 7 | M |
| 23 | 58 | 7 ¼ | 7 ⅛ | L |
| 23 ⅜ | 59 | 7 ⅜ | 7 ¼ | L |
| 23 ¾ | 60 | 7 ½ | 7 ⅜ | XL |
| 24 | 61 | 7 ⅝ | 7 ½ | XL |
| 24 ½ | 62 | 7 ¾ | 7 ⅝ | 2XL |
| 25 | 63 | 7 ⅞ | 7 ¾ | 2XL |
| 25 ½ | 64 | 8 | 7 ⅞ | 3XL |
Want to keep this chart handy for your next hat shopping? Download the hat size conversion chart as a PDF and check your size anytime.
If you already know your hat size, use our Hat Size Converter to check the same size in US, UK, and standard sizes. Just choose your size and the converter will show the others.
One thing to keep in mind: US and UK hat sizes can look very similar, but they are not the same. A UK size is usually one size smaller than the matching US size. If you are buying from a UK brand, check the size in centimeters before choosing your hat.
Between two sizes? If your measurement is between two sizes, choose the larger one. A slightly loose hat is easier to adjust with a hat size reducer, while a tight hat can be uncomfortable to wear.
Common Hat Size Conversions
The numbers can look a little confusing when you switch between inches, centimeters, and hat sizes. These are some of the most common conversions.
7 Hat Size in Centimeters
A US hat size 7 is about 56 cm. The exact measurement is 55.9 cm, so you may see it listed as either 55.9 or 56 cm on different charts. It matches a head measurement of about 22 inches.
7 1/2 Hat Size in Centimeters
A US hat size 7 1/2 is about 60 cm. The exact measurement is 59.7 cm, which is usually rounded to 60 cm. On our chart, this size matches a head measurement of about 23 ¾ inches.
8 Hat Size in Centimeters
A US hat size 8 is about 64 cm. The exact measurement is 63.5 cm, so some charts may show 63.5 cm instead. It matches a head measurement of about 25 inches.
What Hat Size Is a 23-Inch Head?
A 23-inch head measures about 58.4 cm and matches a US hat size 7 1/4 on our chart. The same measurement is EU 58 and UK 7 1/8.
Is a 22-Inch Head a Size 7?
Yes. A 22-inch head measures about 55.9 cm and matches a US hat size 7 on our chart. It is also EU 56 and UK 6 7/8.
Average Adult Hat Size
There is no single hat size that is considered normal for every adult. Head size is different from person to person, so an average can only give you a rough idea.
Average Hat Size for Men
The average adult man usually wears a US hat size around 7 to 7 3/8. This is roughly a 22 to 23 1/4 inch (56 to 59 cm) head measurement. Some men wear smaller or larger sizes, so use your own head measurement to find your actual hat size.
Average Hat Size for Women
A common women’s hat size is around US 6 7/8 to 7 1/4. This is about 21 5/8 to 22 5/8 inches (55 to 58 cm) around the head. Women may need smaller or larger sizes, so measuring your own head is the best way to find your hat size.
Normal Head Size for Adults
There is no single head size that is normal for every adult. Adult head measurements can vary quite a bit, and a size around 21 to 24 inches (53 to 61 cm) is often seen in hat sizing. Your own measurement is more important than an average when choosing a hat size.
Hat Size FAQs
Is 7 3/8 a Medium or Large?
A 7 3/8 is generally a Large hat size. It fits a head measuring about 23 1/4 inches (59 cm). Some brands may list 7 3/8 differently, so check the brand's size chart when buying a specific hat.
Can I Know My Hat Size Without Measuring?
You can get a rough idea from a hat that already fits you well, especially if you know its size. For a new hat, it is better to measure around your head and use that measurement with a hat size chart.
Is a 22-Inch Head Considered Big?
No. A 22-inch head (55.9 cm) is not considered big for an adult. It is about a US hat size 7 and is a common hat size.
Is a 23-Inch Head Big for a Woman?
No, a 23-inch head is not unusually large for a woman. It measures about 58.4 cm and is around a US hat size 7 1/4. When choosing a hat, use your own measurement and compare it with the hat's size chart.
Is a 24-Inch Head Big?
A 24-inch head is on the larger side, but it is not unusual. It measures about 61 cm and is around a US hat size 7 5/8. If you need this size, look for hats that offer larger sizes.
Can I Use This Calculator for Cowboy Hats?
Yes, you can use this calculator to find your cowboy hat size. Cowboy hats use the same head measurement method, but the fit can vary by brand and hat shape. Once you know your size, check the cowboy hat's size chart before buying.