Mode HP from Skills gives the most frequent single result of recoveries and debuffs, along with the probability of that result.
Effective Stamina gives the stamina stat which yields the same HP as the input configuration plus the mode HP from recovery skills alone, ignoring debuffs. It can be considered the HP that removes wit checks from the equivalent HP pool.
As of now, this calculator does not handle recoveries that have no wit check, nor the HP effects of rushed, spot struggle, and downhill running.