You can figure out how much fabric you need for your quilt back using a simple step by step manual way or there are great apps you can download. If you can find 108″ Fabric, it makes the backing easier. However, if you are like me making twin and queen size quilts, you may want to use quilt backing calculators to sew regular fabric together.
Manually Figure out Quilt Backing
Online Quilt Backing Calculators
A lot of quilters love this app. It’s great to use while you are at a store looking at fabric. Download it on your digital devices.