Hat Sizing Calculator
Calculate cast-on stitches and crown decrease rounds for a knit hat based on head circumference, desired height, and gauge.
Inputs
in
in
Results
Cast-On Stitches
96 sts
Decrease Rounds
6
Body Rows (before decreases)44
Total Rows56
Adjusted Circumference19.8 in
Crown Diameter6.3 in
How to Use This Calculator
- Measure head circumference in inches with a flexible tape at the widest point above the ears.
- Enter your stitch gauge in stitches per inch from a blocked gauge swatch.
- Set the negative ease percentage (typically 10-15% for a fitted hat).
- Review the cast-on stitch count and expected hat height in rows.
- Use the recommended decrease round schedule to shape the crown.
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