The Ginger Quilter Quilt Backing Calculator The Ginger Quilter Quilt Backing Calculator Calculate how much backing fabric you need for a quilt? Quilt Length * inch Only number should be used Quilt Width * inch Only number should be used Overage of backing * inch Only number should be used Width of backing yardage * inch Only number should be used How much backing do I need? Option 1 0 yards Option 2 0 yards Calculate Now that you’re almost done with your last quilt project, it looks like you need another one! Check out these kits in our store.