Hat Size Converter
Convert head circumference in cm to US hat size, EU cm hat size, and UK hat size.
How to use this tool
- Enter head circumference in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your us hat size and the full breakdown beneath it.
Measure your head circumference in centimetres and convert to US, EU, and UK hat sizes.
Frequently asked questions
- How do I measure my hat size?
- Use a flexible tape measure around your head about 1 cm above your ears and eyebrows. Round to the nearest centimetre and use the table above.