Combat Formulas By vainamoinen9, Copied from Scapeboard

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Current formula is:

combat = max of melee_combat, mage_combat and ranger_combat

melee_combat = 0.325*(att+str) + (def+hp)/4 + prayer/8
mage_combat = 0.4875*magic + (def+hp)/4 + prayer/8
ranger_combat = 0.4875*ranged + (def+hp)/4 + prayer/8

The magic and ranged factor seems to be 1.5*0.325, so that the type of a fighter depends on
which of these is largest

melee: att+str
mage: 1.5*magic
ranger: 1.5*ranged

Note that continuity of combat levels requires that the rule for determining the fighter
type depends on the factors of the skills in the combat formula, so that if combat formulas
are like

melee_combat=A*str+B*att +C*def+D*hp+E*prayer
mage_combat = F*magic +C*def+D*hp+E*prayer

then type is melee, if A*str+B*att>F*magic. This is the same as in the formula above, that
all combat levels are computed and max applies. Any other rule would make combat to drop in
some situations when type changes. Like when u level up magic to become a mage, combat would
go down. Very likely jagex have not messed up like this.

Also, rumour says Andrew has told that max combat is 126, so it is added there.

Problems:

There are not too many mages and rangers yet in my data (and one of the two mages is one
level off ), so the formula may well be wrong.

Also there is the odd stat of Wyrm (68), with higher att than str, that does not fit at all,
and it seems to require that attack has larger factor than strength in the formula. However,
much more cases go wrong if att has any higher factor, so I can't explain that at all -
there is simply NO LINEAR FOMRULA that would fit all these stats in the table (I checked it
by many search techniques, including combinations of simplex with many random
initializations and partial exhaustive search). So either some of the data in the table are
wrong (which is very likely) or jagex has addded some cross effects between the skills, like
there is in the maxhit formula between str and weapon power.