The question that no tapestry techniques book I’ve ever seen (including mine) addresses is how much weft yarn do you need for a tapestry. Frustrating, right? If you don’t have a yarn stash, how do you know how much to buy?

If you owned a yarn store, you might just grab an extra skein if you ran out and not worry about it. But most of us do not own our own endless yarn supply. We want to make sure we won’t run short but we also don’t want piles of a color we may never use again.

Tapestry weaving has a different structure than other weaving and so the amount of yarn you need is a bit different that if you were weaving a scarf on a rigid heddle loom. However, some of the methods of estimating amounts are similar. There are several approaches you could take to figure out how much weft yarn you need. Warp needs are easier to calculate and I’ll address that at the end of the post.

In the Change the Shed episode on 2/11/26 which I showed in the video above, I had a moment where my brain couldn't remember which way to twist the two different yarns I was using. One yarn was a bundle of 2-ply yarns from weaversbazaar, the other was a bundle of Harrisville Koehler singles I had dyed. If you're going to twist your weft bundle, these two yarns need a different twist direction. I explain that in the video here including what S and Z twist means.