Ability power (AP) is a stat that increases the effectiveness of some abilities, items, and runes. Effects that scale with ability power receive a bonus proportional to its value. For instance, a unit that has 50 ability power and a spell that deals 100 (+ 20% AP) damage will cause that damage value to increase to 110 (100 + (50 × 0.2) = 110).
Every champion starts with 0 ability power, and level-ups do not grant additional ability power.
Ability power can be increased with abilities, items and runes. It 
stacks additively, and each bonus point acquired directly affects its statistic.
- Ability power has a gold value of
21.75 per point.
Ability power as scaling
Many abilities, items, and runes benefit from ability power through their AP ratios. Note that ability power does not always apply to magic damage; ratios can be assigned to any damage type.
The following 22 champions do not have ability power ratios on any of their abilities: 
Aatrox, 
Akshan, 
Camille, 
Darius, 
Dr. Mundo, 
Draven, 
Garen, 
Kalista, 
Kayn, 
Kindred, 
Kled, 
Olaf, 
Pyke, 
Riven, 
Samira, 
Sett, 
Talon, 
Urgot, 
Vayne, 
Xayah, 
Yone, and 
Zed.
Items
Runes
Neutral buffs
Increasing ability power
Items
This table is automatically generated based on the data from Module:ItemData/data.
Item passives
Consumables
Champion abilities
Runes
Neutral Buffs
Decreasing ability power
Champion abilities
Trivia
- The ability with the largest AP ratio is
Annie's Summon Tibbers, with a maximum AP ratio of (+ 615% AP) counting initial cast of (+ 75% AP) and the target taking damage from all 45 ticks of Tibbers aura damage ((+ 12% 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.
Last updated: July 15, 2021, patch V11.14
- Disregarding Veigar, Thresh, Gathering Storm, and Vladimir with Grasp of the Undying, Overgrowth, or Prototype: Omnistone the highest attainable ability power by a champion on Summoner's Rift is a level 18 Kassadin with 1995.89051812 AP.
- Items:
- Runes:
- Other Buffs:
- Kassadin:
- Items (before Seraph's Embrace) = 100 + 15 × 5 + 120 + 145 + 115 + 100 + 65 = 720 AP
- Seraph's Embrace's bonus mana = (( 1879 + 800 + 860) × 1.17625) - 1879 = 2283.74875 bonus mana
- Seraph's Embrace's AP = 65 + (2283.74875 × 0.05) = 179.1874375 AP
- Items (after Seraph's Embrace) = 100 + 15 × 5 + 120 + 145 + 115 + 100 + 179.1874375 = 834.1874375 AP
- Runes = 60 + 30 + 30 + 9 × 2 = 138 AP
- Buffs = 20 + 80 + 50 + 45 = 195 AP
- AP Multiplier = 1 + 0.35 + 0.2 + 0.16 = 1.71
- Kassadin's AP = (834.1874375 AP + 138 + 195) × 1.71 = 1995.89051812 AP
- Items (before
Last updated: January 12, 2021, patch V11.1
- The highest attainable ability power by a champion at level 1 is 91.84 AP on any champion.
- Runes:
- Items:
- 1 × Amplifying Tome
- 1 ×
- Other Buffs:
- Champion:
| Offensive | Ability power ·  Attack damage ·  Attack speed ·  Critical strike chance ·  Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Omnivamp · Physical vamp ·  True damage
|
|---|---|
| Defensive |  Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
|
| Utility |  Ability haste ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration
|
| Other |  Experience ·  Gold generation ·  Movement speed ·  Range
|
