A champion statistic is a number indicating how well a champion can do a certain thing. These help define the assets of a champion. There are 17 official statistics, divided into four categories: Offensive, Defensive, Magic, and Movement.
- Armor penetration: How much the armor values of targets are reduced during physical damage calculations.
- Attack damage: Provides the initial damage value of basic attacks and scaling on some abilities.
- Attack speed: The rate at which a champion uses their basic attack.
- Critical strike chance: The percent chance that a basic attack will critically strike to deal increased damage.
- Critical strike damage: The percentage damage increase provided by critical strikes.
- Life steal: The percentage of the damage done by a champion's basic attacks that is returned to them as health.
- Armor: Used to calculate the reduced damage (in percentage) taken from basic attacks and abilities that deal physical damage. Calculated by Armor/(Armor + 100)
- Health: The total damage a champion may take before dying.
- Health regeneration: The rate at which a champion's health is naturally restored.
- Magic resistance: Used to calculate the reduced damage (in percentage) taken from abilities that deal magic damage. Calculated by Magic Resist/(Magic Resist + 100).
- Ability power: Provides scaling on some abilities.
- Cooldown reduction: The percent reduction in the time after an ability is used by a champion before it can be used again.
- Magic penetration: How much the magic resistance values of targets are reduced during magic damage calculations.
- Mana: The maximum mana available to a champion for casting abilities.
- Mana regeneration: The rate at which a champion's mana is naturally restored.
- Spell vamp: The percentage of the damage done by a champion's abilities that is returned to them as health.
- Movement speed: The speed at which a champion moves around the map.
All champions begin the game with a certain amount of attack damage, attack speed, armor, health, health regeneration, mana, and mana regeneration. This is commonly referred to as the base value of that statistic for that champion. All champions naturally increase these stats by a non-linear amount every time they gain a level. The non-linear amount is based on between 72% and 128% of a champion's Growth statistic (also known as the per level coefficient), which is a static value that is unique to each skill (e.g. Kalista's Health Growth is 83, meaning she gains an amount of health relative to 83 at each level). Each champion's base statistics and growth statistics are unique and play a large role in game balance for that champion. Currently, Gnar is the only champion who can modify his growth statistics.
- The formula for a champion's statistics at any given level is where , and
Two statistics that deviate from this pattern are movement speed and magic resistance. Every champion has a unique base movement speed that does not increase naturally, and every champion begins the game with exactly 30 or 32.1 magic resistance. Magic resistance is the only statistic that increases for some champions and not for others. In general, if a champion is ranged or has a ranged form or is classified as a tank, they will not gain magic resistance per level.
All other statistics have a natural value of zero and must be increased by other sources. The ways a champion may increase their statistics are varied and include runes, masteries, items, and auras. Some champion abilities increase that champion's statistics, either as a passive effect ( Fiora's Riposte passively increases her attack damage as well as Nasus's Soul Eater passively increases his life steal) or as an active effect ( Ryze's Desperate Power briefly increases his movement speed and spell vamp) or as an effect that follows another action ( Nocturne's Shroud of Darkness, for example, passively increases his attack speed and doubles this bonus when he absorbs a spell).
Each champion starts level 1 with a base statistic, and each level he gains a % of his Growth statistic.
Alistar starts level 1 with 613 Health (his Health base statistic).
Alistar's Health Growth statistic is 102.
From level 1 to 2 he will receive a percentage of his Growth statistic. The percentage from level 1 to 2 is 72.
So, Alistar will gain 72% of his Growth statistic (72% from 102 equals to 73.44), ending with 686.4 health on level 2.
Growth statistic per level
How much % of Growth statistic will a champion gain from one level to the next:
Percentage = [(NextLevel × 3.5) + 65]
At level 18 the champion will have won 1700% of the Growth stats (17 x Growth stats), so he ends with 17xGrowth stats + Base stats.
- As of patch 4.20, champion statistics such as health, attack damage, etc. are listed as having a given base value. This is the value at Level 1.  (You can also verify this yourself by entering a game with no runes or masteries and viewing your champion statistics)
- Any unit's attack damage, ability power, attack speed, movement speed, armor, magic resistance, can be seen by selecting that unit in game, along with two bars indicating their current and maximum health and mana (or equivalent resource). If the value is written in blue, that champion has only the base amount of that statistic. If the value is written in green, that statistic has been increased from the base amount through external means.
- Critical strike damage is not shown on the champion statistic page in game. Conversely, range is shown, although it is not one of the official statistics.
- On the champion statistic screen, Magic Penetration is listed as Spell Penetration.
- On the champion statistic screen in spectator mode, Dodge is listed, despite having been removed from the game.
- ↑ http://oce.leagueoflegends.com/en/news/game-updates/patch/patch-420-notes#patch-stats-gained-per-level