Runescape 3 Ability damage Calculator

I tried to calculate the damage numbers for abilities.

This is a work in progress, and probably will not be finished.
But you can use this as a basis for your own calculators or whatever.

Glossary

Word	Meaning
P6	Precise perk at rank 6. Adds 1% per rank of ability max hit % to the min hit %. P6 adds 6%.
E4	Equilibrium perk at rank 4. Adds 3% to minimum hit and subtracts 1% from maximum hit per rank. The 3% and 1% are based on the damage range of the ability, meaning ability max - ability min.

Implementation details

• It handles overloads and prayers.
• It handles Berserk and Berserker aura.
• It only does dual wield melee for now.
• It assumes you perk with Precise 6 and Equilibrium 4.

The actual "library" part is not done.
Most of the ability damage calculation happens in calculate.spec.ts.
(I intend to use jest to test, but I don't want to install anything right now. I don't even have a node_modules folder locally yet).

The file calculate.spec.ts should probably be named main.ts, but I started here with my testing. This was very explorative, as the calculations were not clear from the start.

To run the calculations, use npm run build (assuming you have typescript installed).
Then run node out/calculate.spec.js.

Example output

The table probably looks very broken if you don't have a wide monitor. A picture is attacked at the bottom.

$ node out/calculate.spec.js

Expected: 1960
Actual: 1960
	Main-hand: 2.5*99 + 864*1 + 196
	Off-hand: 1.25*99 + 432*1 + 0.5*196
Expected: 3577 
Actual: 3577
	Main-hand: 2.5*99 + 864*1 + 196
	Off-hand: 1.25*99 + 432*1 + 0.5*196
	Ability multiplier with P6E4 1.8254799999999998
Damage per level
	Expected:  5.1136 7.8688
	Actual:  5.1136 7.8688
--------
Damage with None (+0) : 1960
	Ability damage gets (P6E4) +0
	Max hit: 3684
	Max hit (P6E4): 3577
	Berserk max hit (P6E4): 7154
	Berserk Turmoil max hit (P6E4): 7869
	Berserk Malevolence max hit (P6E4): 8012
Damage with Overload (+17) : 2025
	Ability damage gets (P6E4) +136
	Max hit: 3943
	Max hit (P6E4): 3832
	Berserk max hit (P6E4): 7664
	Berserk Turmoil max hit (P6E4): 8430
	Berserk Malevolence max hit (P6E4): 8583
Damage with Supreme overload (+19) : 2032
	Ability damage gets (P6E4) +152
	Max hit: 3972
	Max hit (P6E4): 3861
	Berserk max hit (P6E4): 7722
	Berserk Turmoil max hit (P6E4): 8494
	Berserk Malevolence max hit (P6E4): 8648
Damage with Elder overload (+21) : 2040
	Ability damage gets (P6E4) +168
	Max hit: 4003
	Max hit (P6E4): 3891
	Berserk max hit (P6E4): 7782
	Berserk Turmoil max hit (P6E4): 8560
	Berserk Malevolence max hit (P6E4): 8715
--------
Off-hand: Off-hand drygore mace
Damage with Berserker aura and None (level 108) : 1995
	Ability damage gets +72
	Ability damage with P6E4 gets +70.8192
	Berserker Max hit: 4204
	Max hit (Eq4): 4083
	Berserker berserk max hit (Eq4): 7425
	Berserker berserk turmoil max hit (Eq4): 8153
	Berserker berserk malevolence max hit (Eq4): 8299
--------
Off-hand: Off-hand drygore mace
Damage with Berserker aura and Overload (level 126) : 2062
	Ability damage gets +216
	Ability damage with P6E4 gets +212.4576
	Berserker Max hit: 4501
	Max hit (Eq4): 4374
	Berserker berserk max hit (Eq4): 7953
	Berserker berserk turmoil max hit (Eq4): 8706
	Berserker berserk malevolence max hit (Eq4): 8856
--------
Off-hand: Off-hand drygore mace
Damage with Berserker aura and Supreme overload (level 128) : 2070
	Ability damage gets +232
	Ability damage with P6E4 gets +228.1952
	Berserker Max hit: 4535
	Max hit (Eq4): 4407
	Berserker berserk max hit (Eq4): 8013
	Berserker berserk turmoil max hit (Eq4): 8769
	Berserker berserk malevolence max hit (Eq4): 8920
--------
Off-hand: Off-hand drygore mace
Damage with Berserker aura and Elder overload (level 130) : 2077
	Ability damage gets +248
	Ability damage with P6E4 gets +243.9328
	Berserker Max hit: 4568
	Max hit (Eq4): 4439
	Berserker berserk max hit (Eq4): 8070
	Berserker berserk turmoil max hit (Eq4): 8829
	Berserker berserk malevolence max hit (Eq4): 8980
--------
┌──────────────────────────────────────────┬────────────────┬─────────────────────┬────────────────────────────┬───────────────────────────────────────┬───────────────────────────────────┬─────────────────┬─────────────────────┐
│                 (index)                  │ damagePerLevel │ berserkerAuraDamage │ berserkerBerserkMaxHitP6E4 │ berserkerBerserkMaxHitP6E4Malevolence │ berserkerBerserkMaxHitP6E4Turmoil │ berserkerMaxHit │ berserkerMaxHitP6E4 │
├──────────────────────────────────────────┼────────────────┼─────────────────────┼────────────────────────────┼───────────────────────────────────────┼───────────────────────────────────┼─────────────────┼─────────────────────┤
│       Off-hand drygore mace - None       │       72       │        1995         │            7425            │                 8299                  │               8153                │      4204       │        4083         │
│     Off-hand drygore mace - Overload     │      216       │        2062         │            7953            │                 8856                  │               8706                │      4501       │        4374         │
│ Off-hand drygore mace - Supreme overload │      232       │        2070         │            8013            │                 8920                  │               8769                │      4535       │        4407         │
│  Off-hand drygore mace - Elder overload  │      248       │        2077         │            8070            │                 8980                  │               8829                │      4568       │        4439         │
└──────────────────────────────────────────┴────────────────┴─────────────────────┴────────────────────────────┴───────────────────────────────────────┴───────────────────────────────────┴─────────────────┴─────────────────────┘

Possible bugs

• Even if armour has decimal values (like my gear with 160.7 strength bonus), it seems the decimal is not used.
  • Alternatively, I have a bug in my code.
• Somewhere, some rounding/flooring might be missing. Or I use too many decimals (jagex seems to prefer 1 decimal). Some results are 1 off.
• Most Worry mod: the overload range is affected by both precise and equil I have not verified overload bonus ability damage yet, caused by the supposed 8*levels. It might be affected by P6E4. So far I only assumed it was affected by E4.
• Most abilities are 1:5 of min:max hit. Using this calculator with an ability that is not, will fail, unless P6E4 multiplier is re-calculated.
• Most Worry mod: this is usually called "damage per level" and isn't unique to overloads. and yes berserk doubles that It is not clear from the wiki if the ability damage boost from overloads is doubled from berserk or +10% from berserker aura.
  • The ability damage boost damage per level is 8 * levels-above-your-actual-level. Berserker aura makes you 9 levels up, and elder overload makes you 21 levels up.