Ability power

Ability power (AP) is a stat that increases the effectiveness of some items, abilities, and runes.

Every champion starts with 0 ability power, and level-ups do not grant additional ability power.

Ability power can be increased with items, abilities and runes, it stacks additively, and each bonus point acquired directly affects its statistic.

Effects that benefit from ability power receive a bonus based on a certain percentage of the current ability power. For example, if a spell deals 100 (+20% AP) damage and a champion has 50 ability power, the spell's damage will increase by 10. In-game, spell descriptions do not display the percentage, but do display the resulting bonus; the previous example would display as 100 (+10).

Gold Value ​​​​​​

• Ability power has a gold value of 21.75 per point.

Ability power as scaling

Many champion abilities use the champion's ability power to calculate the magnitude of that ability.

The following 20 champions do not have  ability power ratios on any of their abilities: Aatrox, Camille, Darius, Dr. Mundo, Draven, Garen, Kayn, Kled, Naafiri, Nilah, Olaf, Pyke, Riven, Samira, Sett, Talon, Urgot, Xayah, Yone, and Zed.

Items

• Guinsoo's Rageblade
• Hextech Gunblade
• Hextech GLP-800
• Hextech Protobelt-01
• Lich Bane
• Luden's Echo
• Nashor's Tooth
• Runic Echoes

Runes

• Fleet Footwork
• Electrocute
• Predator
• Dark Harvest
• Taste of Blood
• Summon Aery
• Arcane Comet
• Nullifying Orb
• Aftershock
• Guardian

Increasing ability power

Items

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Specific to Viktor

• Prototype Hex Core
• The Hex Core mk-1
• The Hex Core mk-2
• Perfect Hex Core

Champion abilities

• Singed's Insanity Potion
• Thresh's Damnation
• Veigar's Phenomenal Evil Power
• Vladimir's Crimson Pact

Runes

• Coup de Grace
• Eyeball Collection
• Ghost Poro
• Transcendence
• Celerity
• Absolute Focus
• Waterwalking
• Gathering Storm
• Chrysalis
• Trait: Domination
• Trait: Precision
• Trait: Resolve
• Trait: Sorcery
• Trait: Inspiration

Neutral Buffs

• Dragon Slayer
• Hand of Baron

Trivia

• The ability with the largest AP ratio is Annie's Summon Tibbers, with a maximum AP ratio of (+ 515% AP) counting initial cast of (+ 65% AP) and the target taking damage from all 45 ticks of Tibbers aura damage ((+ 10% AP) per tick).
• The second and third bounces of Nami's Ebb and Flow scale exponentially, however the low base ratio means it will not beat other spells at normal levels of AP.

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Last updated: August 31, 2018, patch V8.17

• Disregarding Veigar, Thresh, and Gathering Storm, and assuming Kleptomancy gives no biscuits; the highest attainable ability power by a champion on Summoner's Rift is a level 18 Viktor with 2322.176 AP.
• Runes:
  • Kleptomancy
  • Biscuit Delivery
  • Absolute Focus
  • Waterwalking
• Buffs:
  • Viktor will need to have Ornn alongside him.
  • Hand of Baron
  • Three Infernal Drake buffs empowered with the Empowered Aspect of the Dragon buff
  • Pilfered Potion of Rouge
  • Travel Size Elixir of Sorcery
  • Elixir of Sorcery
• Items:
  • Mejai's Soulstealer with 25 stacks
  • Perfect Hex Core
  • Rabadon's Deathcap
  • Rabadon's Deathcrown
  • Seraph's Embrace
  • Spellbinder activated at 100 stacks
• Viktor's AP:
  • Items = 175 + 120 + 200 + 145 + 141.2 + 180 = 961.2 AP
    • Seraph's Embrace's AP = 50 + ( 830 + 200 + 1400 + 450 +  160) × 0.03 = 141.2 AP
  • Runes = 22 + 40 + 30 + 27 + 25 = 144 AP
  • Buffs = 80 + 50 = 130 AP
  • AP Multiplier = 1 + 0.4 + 0.48 = 1.88
    • Viktor's AP = (961.2 + 144 + 130) × 1.88 = 2322.176 AP

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Last updated: August 31, 2018, patch V8.17

• The highest attainable ability power by a champion at level 1 is 88 AP on Viktor. This applies only if it is possible to get at level 1 a Pilfered Potion of Rouge and a Travel Size Elixir of Sorcery through Kleptomancy.

• Runes:
  • Kleptomancy
  • Absolute Focus
  • Waterwalking
• Items:
  • Amplifying Tome
  • Prototype Hex Core

Relevant mathematics:

• Items = 20 +  1 = 21 AP
• Runes = 22 + 5 + 5 + Kleptomancy ( 10 + 25) = 67 AP
  • AP = (21 + 67) = 88 AP

Champion statistics