So, I have been watching the Elizabeth Zimmermann discs and following along in the book and I'm going to attempt the "Seamless Sweater" (Thunder and Lightening begin as Geoff barely speaks the words).
I love all the percentages, being a math teacher; however, she doesn't tell you how to calculate the amount of yarn needed. Is there a nice easy ratio or formula out there? It would have to be based on the gauge but when you add in things like cables or other colours you need more or less yarn. What's the secret.