Hi Mike, I assume what you want is a way to figure out the miter and bevel angles for the boards given a particular slope for sides of the box (or whatever) you are making. For example, if the sides are slanting 15 degrees, what is the correct miter angle and bevel for the ends of the boards? I have not tried the sort of calculator deanbecker mentions. It might make things easy, but I have done two things. First, Bob Rozaieskiu has a good video for how to get those angles without actually using any numbers. What he does is hold the sides of the box at the proper slant, say 15 degrees, and then projects the proper miter onto the adjacent boards. The correct bevel is then more or less automatic. This works okay, but it does involve some juggling to keep all the boards stable at their correct angle while you do the projection. It does have the advantage that (once you get all the juggling down) it works just as well if you want different slants for different sides. Say, front and back slanted at 20 degrees and sides at 10 degrees. Second, I actually have a chart of correct angles I got from Tag Frids book on joinery. Something like that might be available somewhere else as well. It it designed to tell table saw users how to set their miter gauge and the angle of their saw b lade to get the correct cuts for these compound angles. They can be easily used with handwork as well — just set your bevel gauge to those angles. Probably those are the two numbers that deanbecker’s calculator will give you. I will have to look at that