Hat Fit Calculator — Find Your Exact Hat Size
Hatloom Sizing Tool
Enter your head circumference below to find your exact hat size in US, UK and EU sizing. No tape measure? Follow the guide below — all you need is a piece of string and a ruler.
- Wrap a soft tape measure around your head, approximately 1 cm above your ears and across your forehead
- Position it where you would naturally wear a hat — not too high, not too low
- Note the measurement in centimetres or inches and enter it below
- If between sizes, always choose the larger size for comfort
Please enter a valid measurement (48–68 cm / 18.9–26.8”).
| Circumference | US Size | EU Size | General |
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Frequently Asked Questions
How do I measure my head circumference for a hat?
Use a soft tape measure or a piece of string. Wrap it around your head approximately 1 cm above your ears and across the widest part of your forehead — where you would naturally wear a hat. If using string, mark the point where it meets, then measure the length with a ruler. Record in centimetres for the most precise result.
What should I do if I am between hat sizes?
Always choose the larger size. A slightly larger hat can be adjusted with a hat sizing insert or sweatband liner for a snug fit. A hat that is too small cannot be easily stretched without risking damage to the material, especially with structured wool felt or straw styles.
Do hat sizes vary between styles?
Yes. Structured hats such as fedoras and flat caps follow circumference sizing closely. Beanies and knit styles are usually sold in S/M or L/XL and stretch to fit a range. Adjustable caps (snapbacks, drawstring bucket hats) fit most head sizes. Always check the specific product’s sizing notes.
Why does the same hat size fit differently across brands?
Sizing tolerances vary between manufacturers. Some brands size true to circumference; others add extra ease inside the crown. The felt or lining may also change the interior fit. If ordering online, measuring your head rather than relying on a previous hat size from another brand gives the most reliable result.