Question: how to figure out how much yarn you need?
Answer: Step 1: Determine your yarn weight (Column 1) ... 
Step 2: Determine your hook size (Column 2) ... 
Step 3: Determine your inches per single crochet stitch (Column 3) ... 
Step 4: Calculate the total number of stitches in the pattern. ... 
Step 5: Calculate the inches of yarn you'll need. ... 
Step 6: Determine the number of yards you'll need.