Mystery of the Combat Formula

Well, no one knows it, right? Right…
It is, indeed, one the things Jagex keeps undisclosed. People can only guess and experiment. And believe me people did! Oh, yes, for many years Runescape players were looking for the right formula. Fan sites started several research projects to get it right. Did they found it? Yes and No.
Yes, because there are formulas which are 99.9% accurate. And No, because there is no 100% accurate formula. Still 99.9% isn’t bad at all. So now you can see Combat calculators on several fan sites.

But did the formula become open for the general public? Nope, it is still a secret. Now it is a secret of Jagex AND fan sites

Well, I am going to let it out here. Below if the formula I use at Runewise and it is very accurate. I do encourage anyone who is building services for Runescape players to use it. After all, we are all making Runescape community better for the players, are we not?

Note though, that I am not an original author of this formula. I don’t know who is. I myself found this formula in a jungles of PHP developer forums in a closed and forgotten topic a year ago. I cleaned up the code and fixed a few errors, but other than that it is not my invention.

Enjoy!

English Version of the Formula

1. First we calculate the base combat.
If Prayer is an odd number then
base combat = (Defence*100 + Hitpoints*100 + (Prayer-1)*50)/400
If Prayer is an even number then
base combat = (Defence*100 + Hitpoints*100 + Prayer*50)/400

2. Next we calculate personal melee, mage and ranged combats

Melee Combat
Melee Combat = (Attack*130 + Strength*130)/400

Ranged Combat
If Ranged is an odd number then
Ranged Combat = (Ranged*195-65)/400
If Ranged is an even number then
Ranged Combat = (Ranged*195)/400

Mage Combat
If Magic is an odd number then
Mage Combat = (Mage*195-65)/400
If Magic is an even number then
Mage Combat = (Mage*195)/400

3. Pick the highest personal combat (Melee, Ranged or Mage)

You final Combat level is
Base Combat + Highest Personal Combat

PHP version

//calculate base combat
if ($prayer & 1) { $prayer = ($prayer - 1)*50; }
else { $prayer = $prayer*50; }
$base_combat = ($defence*100 + $hitpoints*100 + $prayer)/400;

//calculate personal class combats for melee, ranged and mage
if ($ranged & 1){ $ranged = $ranged*195-65; }
else { $ranged = $ranged*195; }

if ($magic & 1){ $magic = $magic*195-65; }
else { $magic = $magic*195; }

$melee_combat = ($attack*130 + $strength*130)/400;
$range_combat = $ranged/400;
$mage_combat = $magic/400;

//calculate final class combat (get max personal combat)
if ($melee_combat >= $range_combat & $melee_combat >= $mage_combat) {
$class_combat = $melee_combat;
}
elseif ($range_combat >= $melee_combat & $range_combat >= $mage_combat) {
$class_combat = $range_combat;
}
else $class_combat = $mage_combat;

//finalize combat level
$combat_level = $class_combat + $base_combat;

Posted by vrunewise (owner of Runewise)

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