The damage optimization application is used to optimize a single champion's stats for maximum damage output.

Background: All champion damage is a function of a Primary Stat (Attack, Defense, or Hit Points), Crit Chance, and Crit Damage. In general, damage output is a complex function of these three variables. Generally, Crit Chance has higher value than the other two, but has no effect over 100%; therefore, it is usually best to prioritize Crit Chance up to 100%. Once at 100% Crit Chance, optimizing the balance between Primary Stat and Crit Damage can make a tremendous difference in damage output. The higher your champion's Attack (or other Primary Stat), the more it benefits from Crit Damage bonus, and likewise, the higher your champion's Crit Damage bonus, the more valuable Attack becomes. There is only one optimum configuration, per champion, per level, getting as close to this ideal configuration will maximize overall damage output for that champion.

Purpose of the tool: The damage optimization application will tell you which stat combinations (most often from gear upgrades) will provide the greatest damage output for a single champion.

How to use the tool: The easiest way to use the damage optimizer is to use it when deciding between gear upgrades for each slot to determine which piece will provide the greatest increase in damage. The following section will describe each field in detail, followed by some examples.

This is your champion's current stat configuration which is used as a starting point from which to calculate a damage increase from a stat change (delta).

Base Primary Stat: Every skill scales linearly with a Primary Stat (Attack, Defense, or Hit Points). You can find out what Primary Stat any skill scales with by reading the skill description in the Champion window. At the bottom of the skill description will be the statement, "Damage based on: [Primary Stat]".
Every champion has a set of Base Stats that change depending on level, but not gear. In the champion window, there are eight stats in the form, "ATK: 1500 + 1200"; in this case, 1500 is the champion's base Attack. If this champion scales with Attack, enter 1500 into this box.

Total Primary Stat: In the above example, we had a champion with "ATK: 1500 + 1200". If this champion scales with Attack, 1500 is the Base Primary Stat, 1200 is the Bonus Primary Stat (not used by this application), and Total Primary Stat is the sum of these two numbers, 2700.
Note: Total Stats can also be viewed directly by clicking on the "i" symbol above the champion stat window next to the words "Total Stats".

Total Crit Chance: Expressed as a percentage (1 to 100, NOT 0.1 to 1). Total Crit Chance can be taken as the sum of the two numbers in the "C. RATE" row in the character stat window, or can be taken as the single number from the Total Stats window.

Total Crit Damage: Expressed as a percentage (0 to 999). Total Crit Damage can be taken as the sum of the two numbers in the "C. DMG" row in the character stat window, or can be taken as the single number from the Total Stats window.
Note: This is actually Critical Damage BONUS. If this number is 200%, a critical hit will deal 300% of the damage of a normal attack. DO NOT add the extra 100%, use the 200% bonus as given in the Total Stats window.

Deltas are the (usually small) changes in stats that are added to a champion's Initial Stats to calculate a damage increase (or decrease; deltas can be negative!).
-> Deltas can be negative, or zero! <-

For convenience, three different calculators are provided to make usage of the Damage Optimizer straightforward for any combination of stat changes.

Calculate Equivalent Base Stat: Given a change in Crit Chance and/or Crit Damage, calculate the required change in Primary Stat required to achieve equivalent damage increase (or decrease).

Calculate Equivalent Crit Damage: Given a change in Crit Chance and/or Primary Stat, calculate the required change in Crit Damage to achieve an equivalent damage increase (or decrease).

Calculate Equivalent Crit Chance: Given a change in Crit Damage and/or Primary Stat, calculate the required change in Crit Chance to achieve an equivalent damage increase (or decrease).

Calculate Total Damage Increase: Given a change in Primary Stat, Crit Chance, and Crit Damage, calculate the overall change in total damage.

Delta {Stat}: These Deltas are inputs into the three different calculators. They are expressed in percentages. e.g. if a piece of gear has 'Attack 4%' or 'Crit Damage 4%' you would enter '4' into either the Delta Primary Stat or Delta Crit Damage box, respectively. If a piece of gear has a FLAT amount of stat, you will have to convert this to a percent of the champions BASE stat. e.g. if your champion has a Base Attack of 1000, and a piece of gear has Attack 100:

(100 Attack)/(1000 Base Attack) = 0.1*100 = 10%

1. Let's say we have an Attack champion with 1500 base attack, 3500 total attack, 50% crit chance, and 150% crit damage. First, fill in the required input in the first four boxes as so:
   • Base Primary Stat: 1500
   • Total Primary Stat: 3500
   • Total Crit Chance: 50
   • Total Crit Damage: 150
   
   Next, say we have one piece of gear with 10% Attack, and another piece of gear with 8% Crit Chance. Which should we choose?
   We have a number of ways to find out; we can use any of the Calculate Equivalent Base Stat, Calculate Equivalent Crit Chance, or Calculate Total Damage Increase calculators. Let's try with the first two:
   
   With the Calculate Equivalent Base Stat calculator:
   1. Enter '8' into the Delta Crit Chance box
   2. Leave Delta Crit Damage at '0.0'
   3. Press 'Calculate'
   
   The calculator should tell you that 8% Crit Chance is equivalent to 16% Attack. Since 16% Attack is greater than the 10% Attack on the other piece of gear, you should use the piece of gear with 8% Crit Chance. To check that the calculators are consistent, we can also use the Calculate Equivalent Crit Chance calculator.
   
   With the Calculate Equivalent Crit Chance calculator:
   1. Enter '10' into the Delta Primary Stat box
   2. Leave Delta Crit Damage at '0.0'
   3. Press 'Calculate'
   
   The calculator should tell you that 10% Primary Stat is equivalent to 5% Crit Chance. Since 5% Crit Chance is less than the 8% on the other piece of gear, you should choose the piece of gear with 8% Crit Chance.
   
   
   
2. For our second example, let's use the same champion stats from Example 1.
   Say we have another piece of gear with 15% Crit Damage and 10% Attack and another piece with 10% Crit Chance and 2% Attack. For more complex scenarios like these, it may be simpler to use the Calculate Total Damage Increase calculator which allows you to simply input all the stat changes for each piece and compare the total difference. Let's try:
   
   With the Calculate Total Damage Increase calculator:
   First, let's calculate the damage increase from the first piece:
   
   
   1. Enter '15' into the Delta Crit Damage box
   2. Enter '10' into the Delta Primary Stat box
   3. Leave Delta Crit Chance at '0.0'
   4. Press 'Calculate'
   
   The calculator should tell you that these stat changes result in a 8.8% damage increase. Next, let's calculate the damage increase from the second piece:
   
   
   1. Enter '10' into the Delta Crit Chance box
   2. Enter '2' into the Delta Primary Stat box
   3. Leave Delta Crit Damage at '0.0'
   4. Press 'Calculate'
   
   The calculator should tell you that these stat changes result in a 9.5% damage increase. Since this damage increase is higher than that of the first piece (8.8%), you should choose the piece with 10% Crit Chance and 2% Attack.