The size of circle I used here was a 2" to make a 1 1/2" Drunkard's Path Block to use in making a 6 1/2" quilt block.
To make a larger quilt block we would need to use a larger circle. I don't have that math worked out but if you would like me to figure it for you just let me know and I will be happy to help.
You can experiment with paper instead of fabric to practice these steps or to figure out what size circle you might need for the size block you want to make.
NEW INFO--for those of you who are having trouble figuring out how to get a 2" circle for the cardboard circles I just figured out that the cap on my Magic Sizing bottle is a perfect 2"!! Who knew?!!
So take the cap and place the open end on your cardboard and trace around it. Be careful not to squeeze the cap tho or your circle will become an oval! LOL
Hope you enjoy this process and have many happy hours sewing!!!