Ability power (or AP) is a stat that increases the effectiveness of most champions' abilities. Abilities in League of Legends that are affected by ability power have an ability power ratio. This ratio determines how much a particular ability will benefit from a champion's total ability power, whether through increased damage, healing, and other numerical values. Ability power stacks additively.
Calculations To calculate the bonus to a numerical value in an ability, the formula is
- Bonus = AP × AP ratio.
For example, if a damage spell has an ability power ratio of 0.25, every 4 points of ability power will increase the damage of this ability by 1. Abilities that are affected by ability power are identifiable by a bracketed plus sign with a green font, along with a number that corresponds to the applicable bonus. For example a champion with 50 ability power who has an ability with an ability power ratio of 0.7, it will display "+35" (50 × 0.7) next to the corresponding value in the UI.
- +70 ability power, +57 magic resistance. Unique Aura: Nearby enemy champions suffer −20 magic resistance. 2650 gold :
- +20 ability power. 435 gold :
- +45 ability power. Passive: You gain ability power equal to 3% of your maximum mana. +400 mana, +25 mana regeneration. Unique Passive: On cast, you gain +4 maximum mana (maximum +1000 maximum mana). 3 second cooldown. 2855 gold :
- +90 ability power, +15 mana regeneration, +40 magic resist, UNIQUE: +15% cooldown reduction, UNIQUE: Restores 12% of your max mana on kill or assist, UNIQUE: Increases your mana regeneration by 1% per 1% mana you are missing. 2950 gold :
- +40 ability power. 860 gold :
- +80 ability power. Unique Active: Target champion suffers magic damage equal to 15% (+5% per 100 ability power) of their current health (200 damage minimum, range 750, 60 second cooldown). 2600 gold :
- +30 ability power, +7 mana regeneration. Unique Passive: +10% cooldown reduction. 1125 gold :
- +45 ability power. Passive: On cast or hit, you gain +6 ability power and +4% attack speed for 5 seconds (maximum 8 stacks). +35 attack damage. 2235 gold :
- +25 ability power, +200 health. Unique Passive: +20 magic penetration. 1485 gold :
- +70 ability power, +40 attack damage, +15% life steal. Unique passive: +20% spell vamp. Unique Active: Target champion suffers 300 magic damage and is slowed by 50% for 3 seconds. 60 second cooldown and 700 range. 3625 gold :
- +40 ability power. Unique Passive: +12% spell vamp. 1200 gold :
- +25 ability power. Unique Passive: Gain +5 gold per 10 seconds. 765 gold :
- +50 ability power, +35 tenacity. 1200 gold :
- +25 ability power, +50% attack speed. Unique Passive: On hit, target suffers 20 magic damage and minus 6 magic resistance for 8 seconds (maximum 4 stacks). 1825 gold :
- +80 ability power, +30 magic resistance, +350 mana, +7% movement speed. Unique Passive: On cast, for 10 seconds, your next standard attack deals extra damage equal to 100% of your ability power. Cooldown 2 seconds. 3470 gold :
- +75 ability power, +12 mana regeneration. Unique Passive: +20% cooldown reduction. Unique Active: Inflicts target enemy champion with Grievous Wound, causing 50% reduced healing and regeneration for 8 seconds (20 second cooldown). 2330 gold :
- +65 ability power, +50% attack speed, +10 mana regeneration. Unique Passive: +25% cooldown reduction. 2735 gold :
- +80 ability power. 1600 gold :
- +140 ability power. Unique Passive: +30% ability power. 3600 gold :
- +60 ability power. Passive: You gain +2 ability power, +18 health, and +20 mana every 60 seconds (maximum +20 ability power, +180 health, and +200 mana). +450 health, +525 mana. 3035 gold :
- +80 ability power, +500 health. Passive: On hit with ability, target is slowed by 35% for 2 seconds (15% for multi-target abilities). 3105 gold :
- +25 ability power, +250 mana. Unique Passive: On cast, for 10 seconds, your next standard attack deals extra damage equal to 100% of your base attack damage. Cooldown 2 seconds. 1260 gold :
- +30 ability power, +30 attack damage, +30% attack speed, +15% critical strike chance, +250 health, +250 mana, +12% movement speed. Unique Passive: On hit, 25% chance for target to be slowed by 35% (25% for ranged attacks) for 2.5 seconds. Unique Passive: On cast, for 10 seconds, your next standard attack deals extra damage equal to 150% of your base attack damage. Cooldown 2 seconds. 4070 gold :
- +70 ability power. Unique Passive: +40% magic penetration. 2295 gold :
- +50 ability power. Unique Aura: Nearby allied champions gain +30 ability power and +20% spell vamp. 2500 gold :
- +100 ability power, +50 armor. Unique Active: For 2 seconds, you are invulnerable and untargetable but cannot take any actions. 90 second cooldown. 3100 gold :
- +15 ability power, +80 health, +5 mana regeneration. 475 gold :
- On use, grants +20-40 ability power (based on champion level) and +10% cooldown reduction for 4 minutes. 250 :
- +20 ability power. Unique Passive: You gain +8 ability power per stack, receiving 2 stacks for a kill or 1 stack for an assist. This effect can stack 20 times; you lose a third of your stacks if you die. At 20 stacks, you gain +15% cooldown reduction. 1235 gold :
- +25 ability power, +300 health. Unique Passive: +10% cooldown reduction. Unique Passive: On dealing magic damage, gain vision of your target for 4 seconds. Unique Active: Detect stealthed units in target area for 10 seconds. 60 second cooldown. 1435 gold :
- +30 ability power, +7 mana regeneration. Unique Passive: +200 health (does not stack with other Prospector items). 950 gold :
- +50 ability power, +300 health, +350 mana. Unique Passive: Your spells burn for an additional 5% of the target's maximum Health in magic damage over 3 seconds (effect halved for AoE and and damage over time). 2890 gold :
- Grants 30-64 Ability Power based on champion level, 15% Cooldown Reduction, and a huge boost to mana and energy regeneration for 4 minutes. 500 gold :
- +100 ability power. Unique Passive: +10% Movement Speed. Unique Passive: Increases Ability Power by 25%. 2700 gold :
Note: Only the ability power buff effect of these abilities is shown here, to read more information on each of these abilities, follow the link on each of them.
- adds 50% of his total magic resistance to his bonus ability power.
- increases her ability power by Error: Parameter '3' is not accepted. corresponding to her percentage of missing health. The value increases depending on her level.
- Increases the the ability power of the target by 20 / 30 / 40 / 50 / 60.
- grants him 35 / 50 / 65 ability power for 25 seconds.
- aura grants herself and nearby allied champions 4 / 8 / 12 / 16 / 20 bonus ability power while active.
- grants himself 30 / 50 / 70 ability power, and grants nearby allies half of that.
- grants him 16 / 24 / 32 / 40 / 48 ability power for 5 seconds upon activation.
- permanently grants him 1 ability power when the ability kills a unit and passively grants him 1 / 2 / 3 / 4 / 5 ability power when he kills a champion from any damage source.
- grants him 3 ability power per level.
- grants him 45 ability power.
- grants him 1 ability power per 40 bonus health.
- Archmage Archmage increases your champion's ability power by 1.25% / 2.5% / 3.75% / 5% per rank.
- Blast Blast increases your champion's ability power by 0.25 / 0.5 / 0.75 / 1 per champion level (4.5 / 9 / 13.5 / 18 at level 18).
- Mental Force Mental Force increases your champion's ability power by 1 / 2 / 3 / 4 per rank.
- Summoner's Wrath Summoner's Wrath grants +5 ability power while your Ignite spell is on cooldown.
- Summoner's Wrath Summoner's Wrath upgrades your Surge spell to increase ability power gained by 10%.
|Name||Type||Tier 1 (Lesser)||Tier 2 (Normal)||Tier 3 (Greater)|
(Ability Power per level)
|Mark||0.06 per level (1.08)||0.08 per level (1.44)||0.10 per level (1.80)|
|Seal||0.06 per level (1.08)||0.08 per level (1.44)||0.10 per level (1.80)|
|Glyph||0.10 per level (1.80)||0.13 per level (2.34)||0.17 per level (3.06)|
|Quintessence||0.24 per level (4.32)||0.34 per level (6.12)||0.43 per level (7.74)|
- The buff grants +40 ability power (among other bonuses) for 4 minutes.
Aside from, who may obtain any amount of ability power due to the passive effect of his Q, , the maximum ability power obtainable by any champion at level 18 is approximately 2,212 AP, obtained by . To reach this amount, she must:
- have 1 and 5 fully farmed.
- have a full page of Knowledge runes.
- be as close to 0 health as possible ( ).
- have the Summoner's Wrath Summoner's Wrath mastery, 3 ranks in the Expanded Mind Expanded Mind mastery, 4 ranks in the Mental Force Mental Force mastery, 4 ranks in the Blast Blast mastery, and 4 ranks in the Archmage Archmage mastery.
- possess the buff.
- have consumed an .
- have Surge active, and Ignite on cooldown.
- be affected by a aura.
- be affected by the auras of nearby and abilities, and under the effects of .
This combination should result inhaving 2212 AP.
- ( × + + + + + + + + + + + + + ) × (1 + + ) = 2212AP
If, with 5 , a fully-farmed , and the same forementioned auras, spells and buffs, kills with , her ghost will have 3971 AP and Mordekaiser himself will have 2170.