I don't know if this has been shared before. (if it has sorry) But I just came across this and wanted to share
Fabric calculator: http://search.quiltshops.com/calculator/calculator.htm
Binding calculator: http://www.quiltpox.com/calculators.html
and oh la la this one will tell you borders, backing, and more:
and this is where I found them: http://www.martindalecenter.com/Calculators1_1_AB.html#ART-KNIT-QUILTING
you can find knitting calculators and more at this site!