Hat Size Converter
Convert head circumference measurements between international hat sizes, age groups, and hat styles.
Head Measurement Specialist
Typical adult: 54-61 cm
How to Measure Head Circumference
Use a flexible measuring tape around the widest part of your head, about 1 cm above eyebrows, over the ears, and around the back where your head protrudes the most.
Fit Adjustments
%
Material stretch allowance
Size Conversion Results
| Size System | Size | Circumference | Alpha Size | Fit Notes |
|---|