How Much Fabric Is Needed For A Cathedral Window Quilt?

How Much Fabric Is Needed For A Cathedral Window Quilt? Using your rotary cutter and rule, cut the background fabric into 9-1/2′′ squares. You will need four background squares to complete a 9′′ Cathedral Window unit. See chart above for the correct number of 9-1/2′′ squares to cut from background fabric for your quilt size.