I noticed it wouldn't be right for the normal damage formula of dmg*spd to work with knife, otherwise it would always 1-hit kill no matter the speed or hitbox. I also noticed that the knife speed doesn't really tally with a gun's bullet speed.
As far as I know,
* Stab damage is the exact damage stated in the damage setting.
* Fully charged throw has x2 speedof the stated knife speed.
I also found that:
* Dmg 150,000, speed 134. In this exact setting, uncharged knife thrown point-blank(same spot as target) at torso is a 1-hit kill. Anything less doesn't kill.
* Halved damage to 75,000. Speed needs to be 267 to kill.
* Damage 100,000. Speed 200 is just enough to kill. Anything less for dmg/spd won't work.
* In the above 3 points, the total damage is always at least 2,000,000 for the knife to kill.
So how exactly is a thrown knife's damage and speed calculated?
FINAL EDIT:
Finally got the correct numbers. Problem solved.
Knife stab = Dmg
Knife throw = Dmg*Spd (same as bullet)
Uncharged spd = 3/4 of weapons.ini speed
Fully charged spd = 3/2 of weapons.ini speed