Diana, if you want something that would calculate the corner weights when you crank a jack screw in or out, you're talking about something that would get pretty sophisticated. Your results would vary based on the bar diameters, offsets, what you particular chassis stiffness is and a ton of other variables. Unless you builder dynos the chassis before it goes out the door, you aren't gonna have the stiffness data (usually expressed in lbs/one degree of deflection, I think), and it'll doubtless change as the chassis gets run in, fatigues, and gets, um, "rearranged". And that's just for one part of the spreadsheet!
I'll bet the Indycar guys have software like that, but they also have data-logging sensors on every possible pickup point in the car and a DAG (Data Acquisition Guy) to interpret it all...