is this a situation where the slip and slide technique will help you? Can't think of the guy who developed the technique, but I have it on Excel so you will know if your fabric will work. All you need to know is the size of your quilt, how much extra you need on sides to please your quilter, and the width of the fabric you want to use on the back. Insert the numbers where they belong and the formula page automatically computes the number of inches and also yards you need to make it work. If you want a copy send me an email and I'll be happy to share with you. I love this page. All you need is for your computer to have Microsoft Excel so it can open and use the page.