Converter Stall Calculations and or Calculator

Looking for a definitive way to determine the correct stall for a given application.

If (and I don’t) had every piece of information about the application of my car how exactly does one calculate the correct converter stall RPM?

I have searched the web only to find lots of companies making broad suggestions based on differing variables some being quite sympathetic. Others just being vague as to how they come to a particular stall speed. Seems like it's more experience and tribal knowledge than a mathematical approach as I cannot find any equations or calculators to play with.

Since I don’t have some of the information I need like cam specs I want to do some what if’s but ca not get any solid methodical way to run the what if scenarios.

Thanks for reading.....