Ability power

 Ability power (AP) is a stat that boosts the effects of some items, abilities, and runes. Those effects receive a bonus proportional to the ability power of the champion. For example, if a champion has 50 ability power and one of their spells deals 100 (+20% AP) damage, the damage of the spell is 110. The spell descriptions in the game do not show that percentage, they show the resulting bonus. The description of the spell in this example would show the damage of the spell as 100 (+10).

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.

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 19 champions do not have  ability power ratios on any on their abilities: Aatrox, Camille, Darius, Draven, Garen, Kalista, Kayn, Kindred, Kled, Olaf, Pyke, Riven, Sett, Talon, Urgot, Vayne, Xayah, Yone, Zed.

Items

Runes

Neutral buffs

Increasing ability power

Items

Item	Cost	Amount	Availability
Aether Wisp Aether Wisp	850	30	All maps
Amplifying Tome Amplifying Tome	435	20	All maps
Archangel's Staff Archangel's Staff	3200	50	Summoner's Rift
Archangel's Staff (Quick Charge) Archangel's Staff (Quick Charge)	3200	50	Howling Abyss
Ardent Censer Ardent Censer	2300	60	All maps
Athene's Unholy Grail Athene's Unholy Grail	2100	30	All maps
Banshee's Veil Banshee's Veil	3000	75	All maps
Blasting Wand Blasting Wand	850	40	All maps
Bulwark of the Mountain Bulwark of the Mountain	400	25	Summoner's Rift
Dark Seal Dark Seal	350	10	Summoner's Rift
Doran's Ring Doran's Ring	400	15	Summoner's Rift
Fiendish Codex Fiendish Codex	900	35	All maps
Frostfang Frostfang	400	15	Summoner's Rift
Guardian's Orb Guardian's Orb	950	35	Howling Abyss
Guinsoo's Rageblade Guinsoo's Rageblade	3100	25	All maps
Haunting Guise Haunting Guise	1500	35	All maps
Hextech GLP-800 Hextech GLP-800	2800	80	All maps
Hextech Gunblade Hextech Gunblade	3400	80	All maps
Hextech Protobelt-01 Hextech Protobelt-01	2500	60	All maps
Hextech Revolver Hextech Revolver	1050	40	All maps
Liandry's Torment Liandry's Torment	3100	75	All maps
Lich Bane Lich Bane	3200	80	All maps
Lost Chapter Lost Chapter	1300	40	All maps
Luden's Echo Luden's Echo	3200	90	All maps
Luden's Pulse Luden's Pulse	3200	120	All maps
Mejai's Soulstealer Mejai's Soulstealer	1400	20	Summoner's Rift
Morellonomicon Morellonomicon	3000	70	All maps
Nashor's Tooth Nashor's Tooth	3000	80	All maps
Needlessly Large Rod Needlessly Large Rod	1250	60	All maps
Oblivion Orb Oblivion Orb	1600	20	All maps
Rabadon's Deathcap Rabadon's Deathcap	3600	120	All maps
Rabadon's Deathcrown Rabadon's Deathcrown	3600	175	All maps
Relic Shield Relic Shield	400	5	Summoner's Rift
Rod of Ages Rod of Ages	2600	60	Summoner's Rift
Rod of Ages (Quick Charge) Rod of Ages (Quick Charge)	2600	60	Howling Abyss
Runic Echoes Runic Echoes	1500	80	Summoner's Rift
Rylai's Crystal Scepter Rylai's Crystal Scepter	2600	90	All maps
Seeker's Armguard Seeker's Armguard	1100	20	All maps
Seraph's Embrace Seraph's Embrace	0	50	Summoner's Rift
Seraph's Embrace (Quick Charge) Seraph's Embrace (Quick Charge)	0	50	Howling Abyss
Shard of True Ice Shard of True Ice	400	50	Summoner's Rift
Spellbinder Spellbinder	2900	120	All maps
Spellthief's Edge Spellthief's Edge	400	8	Summoner's Rift
Targon's Buckler Targon's Buckler	400	10	Summoner's Rift
Twin Shadows Twin Shadows	2400	70	All maps
Void Staff Void Staff	2650	70	All maps
Zhonya's Hourglass Zhonya's Hourglass	2900	75	All maps
Zhonya's Paradox Zhonya's Paradox	2900	100	All maps

Specific to Viktor

Champion abilities

Runes

Neutral Buffs

Decreasing ability power

Champion abilities

• Mordekaiser's Realm of Death

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: July 28, 2020, patch V10.15

• Disregarding Veigar, Thresh, and Gathering Storm, the highest attainable ability power by a champion on Summoner's Rift is a level 18 Viktor with 2173.248 AP.

• Runes:
  • Conqueror
  • Absolute Focus
  • Waterwalking
  • 2 ×  Adaptive force rune shard
• Items:
  • 1 ×  Perfect Hex Core
  • 1 ×  Rabadon's Deathcrown
  • 1 ×  Rabadon's Deathcap
  • 1 ×  Spellbinder
  • 1 ×  Mejai's Soulstealer
  • 1 ×  Seraph's Embrace
  • 1 ×  Elixir of Sorcery (consumed)
• Other Buffs:
  • You and Me!
  • Hand of Baron

• Viktor:
  • Items = 180 + 175 + 120 + 120 + 80 + 145 + 136.4 = 956.4 AP
    • Seraph's Embrace's AP = 50 + ( 830 + 450 + 200 + 1400) × 0.03 = 136.4 AP
  • Runes = 50.4 + 30 + 30 + 9 × 2 = 128.4 AP
  • Buffs = 20 + 80 + 50 = 150 AP
  • AP Multiplier = 1 + 0.4 + 0.2 + 0.16 = 1.76
    • Viktor's AP = (956.4 + 128.4 + 150) × 1.76 = 2173.248 AP

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Last updated: July 28, 2020, patch V10.15

• The highest attainable ability power by a champion at level 1 is 88.928 AP on Viktor.

• Runes:
  • Conqueror
  • Absolute Focus
  • Waterwalking
  • 2 ×  Adaptive force rune shard
• Items:
  • 1 ×  Amplifying Tome
  • 1 ×  Prototype Hex Core
• Other Buffs:
  • You and Me!

• Viktor:
  • Items = 20 +  1 = 21 AP
  • Runes = 20.4 + 3 + 5 + 9 × 2 = 46.4 AP
  • Buffs = 12 = 12 AP
  • AP Multiplier = 1 + 0.12 = 1.12
    • Viktor's AP = (21 + 46.4 + 12) × 1.12 = 88.928 AP