You don’t always have to use the yarn suggested in patterns — but if you do stray from the recommended yarn, you’ll want to keep a few guidelines in mind. Debbie Stoller shares sage advice for substituting yarn, such as using a yarn in a similar gauge and weight and sticking to the same fiber family. Also important, you’ll learn how to calculate yardage requirements for your new yarn so you won’t run out in the middle of the project (or buy far more than you actually need).

How to Substitute Yarn

Debbie Stoller is the New York Times best-selling author of the Stitch ‘n Bitch series of knitting and crocheting books, and has helped to popularize knitting among a new generation since 1999. She is also the co-founder and editor-in-chief of BUST magazine, and is the co-author of The BUST DIY Guide to Life.