Superior Threads has a reference chart for that. I used that to figure how much thread for my last big quilt. It recommended 3 spools of my choice of thread. I used part of one!! :shock:
So I guess moderate - light - dense... it is all relative.
At least that is a good starting point and .... I'd rather be safe! I'm too far away from quilt shops and do a lot of shopping online.
Joyce