Before I put all my fabrics on foam core boards, I used the ruler method for folding it. So I was already used to having the fabric folded an extra time. I just finished a couple weeks ago getting all my fabrics transferred to the foam core boards and put on my shelves. However, I didn't put anything over 3 1/2 yards on the foam core boards. I just ruler folded it and put all my larger length fabrics are on a shelf all to themselves. I got my foam board at the Dollar Tree for $1 sheet. I cut my pieces 5" X 12" (this height measurement fit my shelves and the double folded fabric well) and I got I think 9 or maybe 10 pieces from each board.