Automatic behavior and quantity planner
Crochet Hat Yarn Choice & Yardage Planner
Choose the job your yarn must do, then estimate grams, yards, meters, and full skeins from your own washed swatch and planned hat dimensions. Complete defaults show a worked example immediately.
1. Choose the yarn behavior
2. Describe the planned hat
Switching units converts the current dimensions.
cm
%
cm
cm
cm of extra fabric
cm
cm; 0 for a beanie
3. Enter the washed swatch
cm
cm
Use the same yarn, hook, stitch, and care method planned for the hat. Measure and weigh the rested, washed swatch—not the foundation edge.
4. Enter the yarn label
% for ordinary variation; add pom-poms, ties, lining, and colorwork separately.
Your measured yarn plan
Method: finished circumference = head × (1 − ease); area = crown disk + body/cuff/slouch rectangle + optional brim annulus; project mass = area × washed swatch mass per area × safety margin; yarn length = project mass × label length per mass. This is a planning estimate, so recheck after any yarn, hook, stitch, care, or size change.