The calculator does not seem to calculate correctly, at least as far as Leadership is concerned. I entered my values based on level 6 buffs :
Your Buffed Self is: 195
Your Buffed Leadership is: 83.75
Your Buffed Loyalty is: 297.75
Your Modified Leadership is: 180.3125
The Total % XP you pass up by hunting: 29.7425 %
XP you pass up from pass up XP (75% MAX): 75 %
XP you GAIN from Pass up XP (125% MAX): 125 %
Your MAX pass up (93.75% MAX): 93.75 %
The Buffed Leadership value seems ok, but the Modified Leadership is wrong :
7.5% for each direct vassal = 7.5 * 12 = 90% = "a bit less than doubling".
So 83.75 * 1.9 = 159.125, not 180.3.
The correct value is a bit below the cap of 163, the reported one is far above it. So it might provide a rude awakening to rely on this calculator
As a further test I entered my base values (which simulates logging out unbuffed) and the result was wrong as well, this time pretty obviously :
Your Buffed Self is: 160
Your Buffed Leadership is: 40
Your Buffed Loyalty is: 254
Your Modified Leadership is: 165
The Total % XP you pass up by hunting: 26.68 %
XP you pass up from pass up XP (75% MAX): 75 %
XP you GAIN from Pass up XP (125% MAX): 125 %
Your MAX pass up (93.75% MAX): 93.75 %
(Un-)Buffed Leadership of 40 + 12 vassals......and it still reports an effective Leadership of 165 instead of the correct 76 ??