Originally Posted by
bearisgray
Are you buying the the thread from a place where you could easily return the unused spools?
If so, I would buy what I think would be "too much" rather than run out.
I am "one of those" that would rather have a spool left over than run out half way through the project.
I don't know how to guesstimate yardage.
I never thought about returning a spool of thread. I just add any leftovers to my thread collection and use it when I can.
Since yours is white and the shelf life for thread is pretty long, I'd pick up another spool and if you don't use it, you can keep it on hand for another project.