Help with backing calculations
I am finishing a top that is 48x57. I found a fabric in my stash that is in two pieces, one piece is 2 yards, the other is 1 yard. I only need 2 0r 3 inches extra on each side. Can someone please help me figure out if I can use this fabric for the backing and if so, how would I do that. I am sure that some of you math experts here can help me. If not I do have another fabric that will easily fit. Any help will be appreciated! I do have the Robert Kaufman app that calculates yardage but I don't think it tells me the info I need for this.