Hat size calculator
Turn head circumference, ease and washed gauge into a brim count and crown decrease plan.
Your calculation
Cast on 104 stitches for a 52 cm circumference.
- Body rounds before shaping
- 41
- Crown rounds
- 21
- Final stitches
- 16
- Flat crochet crown target diameter
- 16.04 cm
Work the plan
- Cast on 104, join without twisting and place 8 evenly spaced markers (13 stitches per sector).
- Work your chosen brim, then knit plain until the total reaches the body-round count.
- Decrease round: knit to two stitches before each marker, k2tog, slip marker. You remove 8 stitches.
- Alternate a decrease round and a plain round until 16 stitches remain. End after the last decrease.
- Cut yarn, draw through the final stitches twice and secure on the inside.
Use your measurements
The brim count is a multiple of the crown sectors. Try the brim before continuing. A crochet flat crown uses the calculated diameter as a measurement target.