Calculator:Combat/Critical hit chance

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Templates used
Calculator:Template/Combat/Critical hit chance

By default, only parameters that are commonly used and have a somewhat significant change to the player's critical hit chance are shown. To see all of the available parameters, toggle the "Show more options" parameter.

template  = Calculator:Template/Combat/Critical hit chance
form      = critProbabilityCalcForm
result    = critProbabilityCalcResult

param     = advancedoptions|Show more options|false|toggleswitch|true,false|true=corbicula,setEffect,prayer,potiongroup,aura,equilibrium,slayerHelm,genocidal,baneAmmo,baneWeaponry,revengegroup
param     = levelgroup|Combat style level and Ability damage||group|level,AD
param     = level|Strength.png: RS3 Inventory image of StrengthMagic.png: RS3 Inventory image of MagicRanged.png: RS3 Inventory image of Ranged Combat style level|99|int|1-99||Base combat style level (from 1 to 99)
param     = AD|Ability damage|2000|int|0-5000||Ability damage as read from the Combat Stats menu after all boosts to combat style level.
param     = forcedCritGroup|Forced critical hit modifiers||group|biting,level20biting,setEffect,pocket,ring,ringChannellers,forcedAbility,abilityFury,abilityGreaterFury,abilityConcentratedBlast,abilityGreaterConcentratedBlast,familiar,corbicula,setEffect,warpriestOfTuska
param     = biting|Biting.png: RS3 Inventory image of Biting Biting perk rank|4|buttonselect|0,1,2,3,4|1=level20biting;2=level20biting;3=level20biting;4=level20biting|+2% per rank
param     = level20biting|Equipment level#Perk benefits.png: RS3 Inventory image of Equipment level#Perk benefits Biting on level 20 gear|false|check|true,false||×1.1 effect to Biting
param     = pocket|Worn Equipment#Pocket slot.png: RS3 Inventory image of Worn Equipment#Pocket slot Pocket slot|None|select|None,Erethdor's grimoire
param     = ring|Worn Equipment#Ring slot.png: RS3 Inventory image of Worn Equipment#Ring slot Ring slot|None|select|None,Reaver's ring,Channeller's ring,Stalker's ring,Champion's ring|Channeller's ring=ringChannellers
param     = ringChannellers|Channeller's ring.png: RS3 Inventory image of Channeller's ring Runic Embrace passive stacks|4|int|0-26
param     = forcedAbility|Ability boost|None|select|None,Fury,Greater Fury,Concentrated Blast,Greater Concentrated Blast|Fury=abilityFury;Greater Fury=abilityGreaterFury;Concentrated Blast=abilityConcentratedBlast;Greater Concentrated Blast=abilityGreaterConcentratedBlast
param     = abilityFury|Fury.png: RS3 Inventory image of Fury Number of Fury hits|2|buttonselect|1,2,3||+5%,10%,15% for each respective hit to the next attack
param     = abilityGreaterFury|Greater Fury.png: RS3 Inventory image of Greater Fury Greater Fury (+10% or 100%)|+10%|buttonselect|+10%,100%||The 100% only works on abilities
param     = abilityConcentratedBlast|Concentrated Blast.png: RS3 Inventory image of Concentrated Blast Number of Concentreated Blast hits|2|buttonselect|1,2,3||+5%,10%,15% for each respective hit to the next attack
param     = abilityGreaterConcentratedBlast|Greater Concentrated Blast.png: RS3 Inventory image of Greater Concentrated Blast Number of Greater Concentreated Blast hits|3|buttonselect|1,2,3||+5%,10%,15% for each respective hit to the next attack
param     = familiar|Kal'gerion Demon scroll (Crit-i-Kal).png: RS3 Inventory image of Kal'gerion Demon scroll (Crit-i-Kal) Kal'gerion Demon scroll (Crit-i-Kal)|false|check|true,false
param     = corbicula|Anachronia Dinosaur Farm#Perks.png: RS3 Inventory image of Anachronia Dinosaur Farm#Perks Number of Corbicula rex farm totems|0|buttonselect|0,1,2||Only affects Meteor Strike.
param     = setEffect|Set effect|None|select|None,Tuska's Might (Sliske's Parody),Tuska's Might (Warpriest of Tuska)|Tuska's Might (Warpriest of Tuska)=warpriestOfTuska|It appears that if the Tuska Warpriest effect and Biting are both used, the Tuska Warpriest effect overrides the effect of Biting.
param     = warpriestOfTuska|Warpriest of Tuska helm.png: RS3 Inventory image of Warpriest of Tuska helm Number of Warpriest of Tuska pieces (3-6)|3|buttonselect|3,4,5,6

param     = naturalCritGroup|Natural critical hit modifiers||group|abilityMin,abilityMax,potiongroup,potion,essence,prayer,aura,slayerHelm,genocidal,baneAmmo,baneWeaponry,revengegroup,revenge,revengeStacks,shieldType,precise,equilibrium
param     = abilityMin|Ability/auto-attack minimum (%)|20|number|0-1000,0.1,0.1
param     = abilityMax|Ability/auto-attack maximum (%)|100|number|0-1000,0.1,0.1
param     = prayer|Prayer.png: RS3 Inventory image of Prayer Prayer/Curse|Malevolence/Affliction/Desolation|select|None,Piety/Augury/Rigour,Turmoil/Torment/Anguish,Malevolence/Affliction/Desolation,Ultimate Strength/OverCharge/Overpowering Force + Amulet of zealots,Leech (Magic/Range) Strength + Amulet of zealots
param     = potiongroup|Potion effects||group|potion,essence
param     = potion|Elder overload potion.png: RS3 Inventory image of Elder overload potion Potion|Elder overload potion|select|None,Supreme strength/magic/ranging potion,Overload,Supreme overload potion,Elder overload potion|None=essence;Supreme strength/magic/ranging potion=essence|Berserk blood essence can be included if an overload variant is not selected.
param     = essence|Berserk blood essence.png: RS3 Inventory image of Berserk blood essence Berserk blood essence|false|check|true,false
param     = aura|Worn Equipment#Aura slot.png: RS3 Inventory image of Worn Equipment#Aura slot Aura|Berserker/Maniacal/Reckless aura|select|None,Berserker/Maniacal/Reckless aura,Equilibrium aura
param     = slayerHelm|Corrupted slayer helmet#Upgrades.png: RS3 Inventory image of Corrupted slayer helmet#Upgrades Slayer helmet|None|select|None,Full slayer helmet,Reinforced slayer helmet,Strong slayer helmet,Mighty slayer helmet,Corrupted slayer helmet
param     = genocidal|Genocidal.png: RS3 Inventory image of Genocidal Genocidal boost (%)|0|number|0-6.9,0.1,0.1
param     = baneAmmo|Dragonbane arrow.png: RS3 Inventory image of Dragonbane arrow Bane ammunition|false|check|true,false
param     = baneWeaponry|Dragon bane longsword.png: RS3 Inventory image of Dragon bane longswordBane weaponry|false|check|true,false
param     = revengegroup|||group|revengeStacks,shieldType,revenge
param     = revenge|Revenge.png: RS3 Inventory image of Revenge Revenge|false|check|true,false|true=revengeStacks,shieldType
param     = revengeStacks|Revenge stacks|10|buttonselect|0,1,2,3,4,5,6,7,8,9,10
param     = shieldType|Type|Shield|buttonselect|Shield,Defender/Rebounder/Repriser
param     = precise|Precise.png: RS3 Inventory image of Precise Precise perk rank|6|buttonselect|0,1,2,3,4,5,6
param     = equilibrium|Equilibrium.png: RS3 Inventory image of Equilibrium Equilibrium perk rank|2|buttonselect|0,1,2,3,4
Please wait for the calculator form to load. Please input your data and submit the form.
Template documentation
This documentation is transcluded from Calculator:Combat/Critical hit chance/doc. [edit] [history] [purge]


The purpose of this calculator is to calculate probability of the player's total critical hit chance as well as the two types of critical hits that are part of this total: forced critical hits and natural critical hits. More information about the difference between forced and natural can be found here.

Show more options

Displays less commonly used options that have an effect on the player's forced and natural critical hit chances.

Combat style level

Players base combat style level (from 1 to 99) in the appropriate style.

Biting perk rank

Rank of the Biting perk.

Biting on level 20 gear

Multiplicative 10% increase to the effect of Biting if checked. (×1.1 effect to Biting)

Ring slot

Rings that affect the player's forced critical hit chance.

Runic Embrace passive stacks

Runic embrace, the passive effect of the Channeller's ring, gives the player a +4% forced critical hit chance per hit of a magic channelled ability. (For example, the first hit of Asphyxiate receives a +4%, the second hit receives a +8%, etc.)

Ability boost

Certain abilities increase the player's forced critical hit chance.

Number of Fury hits

The attack following the specific hit of Fury.

Greater Fury (+10% or 100%)

Greater Fury gives either a +10% chance to force a critical hit if Greater Fury itself does not land a critical hit. If Greater Fury does land a critical hit, the player's next ability has a 100% chance to land a forced critical hit.

Number of Concentrated Blast hits

The attack following the specific hit of Concentrated Blast.

Number of Greater Concentrated Blast hits

The attack following the specific hit of Greater Concentrated Blast.

Kal'gerion Demon scroll (Crit-i-Kal)

The effect of the Kal'gerion Demon familiar scroll.

Number of Corbicula rex farm totems

+20% increased critical hit chance to the Meteor Strike ability.

Set effect

Sets that have an effect on the player's forced critical hit chance. These appear to completely override the Biting perk as the two options are both different ways of applying Tuska's Might.

Number of Warpriest of Tuska pieces

The number of Warpriest of Tuska pieces equipped. +1% per piece worn, minimum of 3.

Ability/auto-attack minimum (%)

Player's ability or auto-attack minimum percentage.

Ability/auto-attack maximum (%)

Player's ability or auto-attack maximum percentage.


Player's active damage boosting prayer/curse.


Player's active stat boosting potion.


Player's active aura. If the player has the Equilibrium aura active, the Equilibrium perk is ignored.

Slayer helmet

Choice of Slayer helmet. Only works if the player's target is part of their slayer task (and is also affected by the effect of the Slayer helmet damage boosting passive).

Genocidal boost (%)

Genocidal perk boost ranging from 0%-6.9% in increments of 0.1% (7% cannot be obtained). Only works if the player's target is part of their slayer task (and is also affected by the effect of the Genocidal perk).

Bane ammunition

Effect of bane ammunition on a target susceptible to the effect of the approrpriate bane ammunition.

Bane weaponry

Effect of bane weaponry on a target susceptible to the effect of the appropriate bane weaponry.


Player has the revenge ability active.

Revenge stacks

Number of Revenge stacks. Range is 0-10 stacks.


Choice of player having either a shield or a defender/rebounder/repriser equipped while under the effect of Revenge.

Precise perk rank

Rank of the Precise perk.

Equilibrium perk rank

Rank of the Equilibrium perk rank. If the player has the Equilibrium aura active, then the perk is ignored.