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. Darius, Draven, Garen, Olaf, Riven, Talon, Vayne, and Zed have no abilities or innate effects that scale with ability power.

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.

Increasing ability power Edit

Items Edit

Core Edit

• Abyssal Scepter: +70 ability power, +45 magic resistance. Unique Aura: Nearby enemy champions suffer −20 magic resistance. 2560 gold
• Amplifying Tome: +20 ability power. 435 gold
• Archangel's Staff: +60 ability power. Unique Passive – Insight: Gain ability power equal to 3% of your maximum mana. +10 mana regeneration per 5 seconds, +250 mana. Unique Passive – Mana Charge: Each time you cast a spell or spend mana, you gain 6 maximum mana (3 second cooldown). Bonus caps at +750 bonus mana. 2700 gold.
• Athene's Unholy Grail: +60 ability power, +15 mana regeneration, +40 magic resist. Unique Passive: +20% cooldown reduction Unique Passive: Restores 12% of your max mana on kill or assist, Unique Passive - Mana Font: Increases your mana regeneration by 1% per 1% mana you are missing. 2600 gold
• Banner of Command: +40 ability power, +30 armor, 10% cooldown reduction. Unique Aura - Valor: Nearby allies gain 10 health regen per 5 seconds and nearby allied minions deal 15% increased damage. Unique Active - Promote: Transforms a nearby siege minion to a more powerful unit. You gain all the gold this unit earns. 180 second cooldown. 2360 gold
• Blasting Wand: +40 ability power. 860 gold
• Deathfire Grasp: +120 ability power. +10% cooldown reduction. Unique Active: Deals 15% of target champion's maximum health in magic damage and amplifies all magic damage they take by 20% for 4 seconds. 60 second cooldown (750 range). 3100 gold
• Fiendish Codex: +30 ability power. Unique Passive: +10% cooldown reduction. 820 gold
• Guinsoo's Rageblade: +40 ability power, + 35 attack damage. Passive: Your basic attacks and spellcast grant you 4% attack speed and 4 ability power for 8 seconds (maximum 8 stacks). Unique Passive: Falling below 50% health grants you 20% attack speed, 10% life steal and 10% spell vamp until you exit combat. 30 second cooldown. 2600 gold
• Haunting Guise: +25 ability power, +200 health. Unique Passive - Eyes of Pain: +15 magic penetration. 1485 gold
• Hextech Gunblade: +65 ability power, +45 attack damage, +10% life steal, +20% spell vamp. Unique Passive: Your basic attacks and single target spells against champions reduce the cooldown of this item by 3 seconds. Unique Active: Deals 150 + 40% of your ability power as magic damage and slows target champion's movement speed by 40% for 2 seconds. 60 second cooldown and 700 range. 3400 gold
• Hextech Revolver: +40 ability power. Unique Passive: +12% spell vamp. 1200 gold
• Iceborn Gauntlet: +30 ability power, +500 mana, +70 armor, +10% cooldown reduction. Unique Passive - Spellblade: After using an ability, your next basic attack deals bonus physical damage equal to 125% of your base attack damage to surrounding enemies and creates a field for 2 seconds that slows enemies inside by 30%. 2 second cooldown. 3250 gold
• Kage's Lucky Pick: +25 ability power. Unique Passive - Lucky Shadow: Gain +4 gold per 10 seconds. 765 gold
• Lich Bane: +80 ability power, +250 mana, +5% movement speed. Unique Passive - Spellblade: After using an ability, your next basic attack deals bonus magic damage equal to 50 + 75% of your ability power. 2 second cooldown. 3000 gold
• Malady: +25 ability power, +45% attack speed. Unique Passive: Your basic attacks deal 15 + 10% of your ability power as bonus magic damage. Unique Passive: Your basic attacks reduce enemy magic resistance by 4 for 8 seconds. Stacks up 7 times. 2035 gold
• Morellonomicon: +75 ability power, +12 mana regeneration, +20% cooldown reduction. Unique Passive: Dealing magic damage to an enemy champion below 40% health inflicts Grievous Wounds to them for 4 seconds. 2200 gold
• Nashor's Tooth: +65 ability power, +50% attack speed. Unique Passive: +20% cooldown reduction. 2500 gold
• Needlessly Large Rod: +80 ability power. 1600 gold
• Rabadon's Deathcap: +120 ability power. Unique Passive: Increases ability power by 30%. 3300 gold
• Rod of Ages: +60 ability power. Passive: You gain +2 ability power, +20 health, and +20 mana every 60 seconds (maximum +20 ability power, +200 health, and +200 mana). +450 health, +450 mana. Unique Passive: On leveling up, restores 150 health and 200 mana over 8 seconds. 2800 gold
• Rylai's Crystal Scepter: +80 ability power, +500 health. Unique Passive: Dealing spell damage slows the target' movement speed by 35% for 1.5 seconds. (15% for multi-target and damage-over-time spells). 2900 gold
• Seeker's Armguard: +20 ability power, +30 armor. Unique: Killing a unit grants 0.5 bonus armor and ability power. This bonus stacks up to 30 times. 1160 gold
• Seraph's Embrace: +60 ability power, Unique Passive - Insight: Gain ability power equal to 3% of your maximum mana., +1000 mana, +10 mana regen. Unique Active - Mana Shield: Drains 20% of your current mana to shield yourself for an equal amount plus 150 for 3 seconds (120 second cooldown). 2700 gold
• Shard of True Ice: +40 ability power. Unique Passive - Lucky Shadow: Gain an additional 4 gold every 10 seconds. Unique Aura - Mana Warp: Nearby allied champions gain 6 mana regen per 5 seconds. Unique Active: Surrounds an ally with a blizzard for 4 seconds that slows nearby enemy movement speed by 30%. 60 second cooldown. 1700 gold
• Sheen: +25 ability power, +200 mana. Unique Passive - Spellblade: After using an ability, your next basic attack deals bonus physical damage equal to your base attack damage. 2 second cooldown. 1200 gold
• Spirit of the Spectral Wraith: +50 ability power, +10 mana regeneration. Unique Passive: +20% spell vamp, +10% cooldown reduction. Unique Passive - Butcher: Damage dealt to neutral monsters increased by 25%. 2000 gold.
• Trinity Force: +30 ability power, +30 attack damage, +30% attack speed, +10% critical strike chance, +250 health, +200 mana, +8% movement speed. Unique Passive - Icy: Your basic attacks have a 25% chance to slow your target's movement speed by 30% for 2 seconds (20% for ranged.) Unique Passive - Spellblade: After using an ability, your next basic attack deals bonus physical damage equal to 150% of your base attack damage. 2 second cooldown. 3843 gold
• Twin Shadows: +40 ability power, +40 magic resistance, +6% movement speed. Unique Active - Hunt: Summons up to 2 invulnerable ghosts for 6 seconds to seek the two nearest enemy champions. If they touch an enemy champion, they slow his movement speed by 40% and reveal him for 2.5 seconds. 120 second cooldown. 1900 gold
• Void Staff: +70 ability power. Unique Passive: +35% magic penetration. 2295 gold
• Will of the Ancients: +50 ability power. Unique Aura: Nearby allied champions gain +30 ability power and +20% spell vamp. 2550 gold
• Zhonya's Hourglass: +120 ability power, +50 armor. Unique Active - Stasis: For 2 seconds, you are invulnerable and untargetable but cannot take any actions. 90 second cooldown. 3260 gold

Classic Edit

• Doran's Ring: +15 ability power, +80 health, +3 mana regeneration. Passive: Restores 5 mana when you kill an enemy unit. 475 gold
• Elixir of Brilliance: On use, grants +25-40 ability power (based on champion level), +10% cooldown reduction for 3 minutes. 250 gold
• Liandry's Torment: +50 ability power, +300 health. Unique Passive - Eyes of Pain: +15 magic penetration. Unique Passive: Dealing spell damage burns enemies for 5% of their current health as magic damage over 3 seconds. If their movement is impaired, they take double damage from this effect. Multi-target or periodic effects deals 2.5% over 1.5 seconds. 300 max damage vs monsters. 2900 gold
• Mejai's Soulstealer: +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

Dominion & Twisted Treeline Edit

• Blackfire Torch: +80 ability power, +250 health. Unique Passsive: +20% cooldown reduction. Unique Passive - Eyes of Pain: +15 magic penetration. Unique Passive: Your spells burn for an additional 3.5% of the target's maximum Health in magic damage over 2 seconds. Each second consumes a charge. Up to 18 charges are generated when no in use. 3770 gold
• Hextech Sweeper: +50 ability power, +300 health. Unique Passive: +10% cooldown reduction, +10% movement speed. Unique Passive - Trap Detection: Nearby stealthed enemy traps are revealed. Unique Active: A stealth-detecting mist grants vision in the target area for 10 seconds. 60 second cooldown. 1920 gold
• Ichor of Illumination: 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
• Prospector's Ring: +30 ability power, +7 mana regeneration. Unique Passive: +200 health (does not stack with other Prospector items). 950 gold
• Wooglet's Witchcap: +100 ability power, + 40 armor. Unique Passive: Increase ability power by 25%. Unique Active: Places your champion into stasis for 2.5 seconds, rendering you invulnerable and untargetable but unable to take any action. 90 second cooldown. 3500 gold

Champion abilities Edit

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.

• Galio's  Runic Skin adds 50% of his total magic resistance to his bonus ability power.
• Lulu's  Whimsy Increases the the ability power of the target by 20 / 30 / 40 / 50 / 60.
• Singed's  Insanity Potion grants him 35 / 50 / 65 ability power for 25 seconds.
• Sona's  Hymn of Valor aura grants herself and nearby allied champions 4 / 8 / 12 / 16 / 20 bonus ability power while active.
• Taric's  Radiance grants himself 30 / 50 / 70 ability power, and grants nearby allies half of that amount.
• Thresh's  Damnation passively generates souls for him to collect, with each soul collected granting ability power permanently, with the first soul being worth 1 ability power and subsequent souls being worth 0.01 less down to 0.5 ability power per soul collected.
• Veigar's  Baleful Strike 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.
• Viktor's  Evolving Technology grants him 3 ability power per level.
• Viktor's  Augment : Death grants him 45 ability power.
• Vladimir's  Crimson Pact grants him 1 ability power per 40 bonus health.

Masteries Edit

• Archmage increases your champion's ability power by 1.25 / 2.5 / 3.75 / 5% per rank.
• 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 increases your champion's ability power by 2 / 4 / 6 per rank.
• Summoner's Wrath grants +5 ability power while your Ignite spell is on cooldown.

Neutral buffs Edit

• The Exalted with Baron Nashor buff grants +40 ability power (among other bonuses) for 4 minutes.

Runes Edit

• Force and Potency runes increase ability power.

Name	Type	Tier 1 (Lesser)	Tier 2 (Normal)	Tier 3 (Greater)
Force (Ability Power per level)	Mark	0.06 per level (1.08) 30	0.08 per level (1.44) 165	0.10 per level (1.80) 410
	Seal	0.06 per level (1.08) 30	0.08 per level (1.44) 165	0.10 per level (1.80) 410
	Glyph	0.10 per level (1.80) 30	0.13 per level (2.34) 165	0.17 per level (3.06) 410
	Quintessence	0.24 per level (4.32) 80	0.34 per level (6.12) 410	0.43 per level (7.74) 1025
Potency (Ability Power)	Mark	0.33 30	0.46 165	0.59 410
	Seal	0.33 30	0.46 165	0.59 410
	Glyph	0.66 30	0.92 165	1.19 410 Edit
	Quintessence	2.75 80	3.85 410	4.95 1025

Champion statistics
Offensive	Attack damage Attack speed Critical strike Life steal Armor penetration Movement speed
Defensive	Health Health regeneration Armor Magic resistance
Magical	Mana Mana regeneration Ability power Cooldown reduction Magic penetration Spell vamp