Convert your hat size between US, UK, EU, centimeters, and inches. Enter the hat size or head measurement you know to see the equivalent sizes.
Hat Size Converter
Choose your US, UK, or EU hat size, or enter your head measurement in cm or inches to convert it to other hat sizes.
Hat Size Conversion Chart
| Inches | EU Hat Size | US Hat Size | UK Hat Size | Alpha Size |
|---|---|---|---|---|
| 20.08 | 51 | 6 ⅜ | 6 ¼ | S |
| 20.47 | 52 | 6 ½ | 6 ⅜ | S |
| 20.87 | 53 | 6 ⅝ | 6 ½ | S |
| 21.26 | 54 | 6 ¾ | 6 ⅝ | S |
| 21.65 | 55 | 6 ⅞ | 6 ¾ | S |
| 22.05 | 56 | 7 | 6 ⅞ | M |
| 22.44 | 57 | 7 ⅛ | 7 | M |
| 22.83 | 58 | 7 ¼ | 7 ⅛ | L |
| 23.23 | 59 | 7 ⅜ | 7 ¼ | L |
| 23.62 | 60 | 7 ½ | 7 ⅜ | L |
| 24.02 | 61 | 7 ⅝ | 7 ½ | XL |
| 24.41 | 62 | 7 ¾ | 7 ⅝ | XL |
| 24.80 | 63 | 7 ⅞ | 7 ¾ | XXL |
| 25.20 | 64 | 8 | 7 ⅞ | XXL |
How Hat Sizes Convert
Hat sizes look different, but they all point to the same thing: the measurement around your head.
For example, if your head measures 58 cm (22.8 inches), the matching sizes on the chart are about:
US 7¼ = UK 7⅛ = EU 58
So if one hat is labeled EU 58 and another is US 7¼, they are made for about the same head measurement.
US Hat Size
US fitted sizes use numbers such as 7, 7⅛, 7¼, 7⅜, and 7½. The sizes increase in small steps, which is why you see fractions such as ⅛, ¼, and ⅜.
Use your head measurement and the chart above to find the US size that matches it. You don't need to calculate the size yourself.
UK Hat Size
UK fitted sizes use numbers too. In the sizing system used in the chart above, the UK size is ⅛ smaller than the US size for the same head measurement.
For example:
US 7¼ = UK 7⅛ = EU 58
Lock & Co., a British hat maker, uses this same US-to-UK sizing pattern in its published size chart.
EU Hat Size
EU sizing is simple because the size number matches the head measurement in centimeters.
If your head measures 58 cm, your EU size is 58.
So if you see EU 58, you know it is meant for a head measuring about 58 cm around.
Letter Sizes
Letter sizes such as S, M, L, and XL work differently. Each letter covers a range of head measurements rather than one exact size.
There is no single S, M, or L range that every brand uses. One brand may use M for 57 to 58 cm, while another may use a different range.
If a hat only comes in letter sizes, check the brand's size chart. Match your head measurement to the range that brand gives for S, M, L, or XL.
How Do I Find My Hat Size?
To find your hat size, measure around your head with a flexible measuring tape. Then match your measurement to a hat size chart to find the right size.
Now, use that number in the hat size converter above to find your US, UK, or EU hat size.
If you already have a hat that fits well, check the size on the tag or inside the hat. You can enter that size into the converter above to see the equivalent sizes.
Need more help with measuring? Our How to Measure Your Head for a Hat guide walks you through it step by step.
What If You're Between Hat Sizes?
If your head measurement falls between two sizes, start with the larger size. This usually gives you a better fit, especially with a fitted hat that does not stretch.
For example, if your measurement falls between US 7¼ and 7⅜, start with 7⅜.
Fitted or Stiff Hats
A fitted hat made from firm material has very little room to stretch. If you choose the smaller size, it may feel too tight around your head, and there's no easy way to loosen a hat that's already too small.
If you're between sizes, the larger size is the safer choice. You can always tighten a slightly loose hat with sizing tape or a hat-size reducer, which are foam strips that stick under the sweatband to take up extra room.
Soft or Stretch Hats
Soft hats, beanies, and stretch-fit caps have more give. If the material stretches, a size that is slightly smaller may still fit comfortably.
Check how the brand describes the fit before choosing your size.
Check the Brand's Size Chart
Hat sizes can vary a little between brands. If your measurement falls between two sizes, check the brand's own size chart before you buy. The chart will tell you which head measurement each size is made to fit.
If the Hat Is Slightly Loose
You don't need to return a hat just because it's a touch loose. Sizing tape or a hat-size reducer, sold as foam strips that fit under the sweatband, can take up the extra space and hold the hat more securely.
One strip usually reduces the size by about half a step, so you can add more strips for a bigger adjustment.
Frequently Asked Questions
What is my hat size if my head is 22 inches?
A 22-inch head is about a US size 7. It measures about 56 cm, which is roughly UK 6⅞ or EU 56.
What is my hat size if my head is 24 inches?
If your head measures 24 inches around, you need about a US 7⅝. That is roughly 61 cm, or UK 7½ / EU 61.
What is a 7¼ hat size in cm?
A US 7¼ hat size fits a head of about 58 cm (22.8 inches). The same measurement is roughly EU 58 and UK 7⅛.
What is a size 58 hat in US size?
A size 58 hat is about a US 7¼. In the EU system, the number refers to head circumference, so size 58 means about 58 cm (22.8 inches) around the head.
What is the difference between US and UK hat sizes?
US and UK hat sizes use different numbers, but they can fit the same head size. The UK number is usually ⅛ smaller than the US number. For example, US 7¼ is the same head size as UK 7⅛. Both fit a head that measures about 58 cm (22.8 inches) around.
Find the Right Hat for Your Face Shape
Once you have your hat size, you can start looking at styles that suit you. Your face shape is a good place to start.
If you already know your face shape, read How to Choose a Hat for Your Face Shape to find hat styles that may suit you.
If you don't know your face shape, use the Face Shape Calculator first. It will help you figure that out before you choose a style.