I'm not sure what it would be called.. basically I'd love a calculator that gave me a sliding scale of how many / size of pieces I could get out of various pan sizes. ie. 13in x 9in pan can be divided up into the falling ways: 20 "x in by x in" inch pieces, 25 "x in by x in" pieces.
Of course, there might be some answers that leave some wastage if you want just whole numbers or rounded to nearest half inch. etc
Anyone heard of something like this ? When I googled it, my closest results were from patchwork quilters and their calculators.