I have an app on my ( android) phone that does all the calculations for you is
Backing fabric,
Binding fabric,
Border fabric including multiple borders
Fabric amount needed for a number of pieces of a certain size
Number of pieces of certain size that can be cut from a piece of fabric - good for stash busting
Size of squares to sub-cut into HST's or QST's for setting triangles
It works in both metric and imperial units too
It's allied to Robert Kaufman but it was free to download. I found it by searching for quilting calculator and have found it to be really helpful