Question: how to figure out how much yarn for long tail cast on?
Answer: So, for instance, if your finished project is going to be 12 inches wide, you'd want a long tail about 40 inches long (12 x 3 = 36 + 3.6 = about 40). She also reminds you to "keep your tail on your thumb," meaning that the tail end of the yarn goes in front as you make the stitches.