How to use this calculator:

1. Select the age range for your hat.
2. Choose your yarn weight/type.
3. Optionally select a textured stitch for added visual interest.
4. Click "Calculate Hat Pattern" to get measurements and instructions.
5. Review the instructions and click "Download Instructions" to save them as a text file.

Remember: Gauge is crucial for a well-fitting hat. Always make a gauge swatch before starting!