0
Mindless; 0 IQ (Man-Thing)

1
Animal or severly disabled; 50 IQ

2
Low IQ Human; 50 IQ (Rhino, Rob)

3-4
Average IQ Human; 75-100 IQ (Luke Cage, Rogue)

5-6
High-IQ Human; 125-150 IQ (Captain America, Wolverine)

7-8
Genius-level human; 225-250 IQ (Doctor Strange, Spider-Man)

9-10
Maximum human; 225-250 IQ (Iron Man, Giant Man)

11-12
Enhanced or peerless Intellect; 275-300 IQ ( Mister Fantastic, Doctor Doom)

13-14
Far smarter than human; 325-350 IQ (Dormammu)

15-16
Unbeleivably smart; 375-400 IQ (Mephisto, Uni-Mind)

17-18
Overwhelmingly Smart; 425-450 IQ (Kree Supreme Intelligence)

19-20
Ultimate limit of mortals; 475-500 IQ (Uatu the Watcher, High Evolutionary)