@steinbring It's not a thing you calculate. https://en.wikipedia.org/wiki/EPSG_Geodetic_Parameter_Dataset
@steinbring The documentation you linked had a clue once you clicked through to SRID, and that gets a search term that pulls up the wikipedia entry, but yeah, some more detail and other examples would be useful.
@neal You would not believe how much that answer helps. I was super annoyed that there isn't an answer on Google for this.