This may help. Print out what Quilter's Cache is giving you. Should you require a larger size, go to the Proportional Scale and find the percentage of the enlargement needed. Quilter's Cache size: 5", need finished size 7" = enlarge 141%.
I'm taking it for granted that every quilter has a proportional scale. If not, it is an inexpensive tool found at art and office supply stores. Invaluable!