How to estimate yarn for edging
I just bought Nicky Epstein's Knitting on the Edge. I am on a shawl kick and wanted to try edgings that would challenge my skills  but I am stuck on figuring out how much yarn to buy for the edging. I had planned to just make a shawl in a size and shape I know, varying the main body with various stitches and wanted to just add edging  but I am afraid I will get 3/4s of the way around and run out of yarn. I suppose I could do geometry and figure the area of the edging vs the area of the shawl and then do algebra to figure out the missing number but isn't there an easier way???
