Range is a value that defines how far an autoattack or ability can reach.
Range is defined in an arbitrary quantities of "units". It shares the scale of "units" with movement speed, so one point translates to one game distance unit traveled. Note that autoattack range is defined differently than ability range.
Given a source unit's hitbox and a target unit's hitbox, range is calculated as follows: autoattack range from edge to edge; targeted skill range from center to center; skillshot range from edge to edge; and the range of self-centered area of effects are from the edge of the source (the larger champions don't benefit less from auras than smaller champions). The difference is approximately 100 (i.e. 550 autoattack range is roughly 650 casting range)[1][2][3]
Each champion begins the game with a particular base autoattack range. This can vary from 125 to 250 for melee units and 300 to 650 for ranged units. As of 8.5, the highest autoattack range is 750 held by 
Kindred with 25 
marks, surpassing the 661 range of level 18 
Tristana's 
Draw a Bead at 16 marks (675). 
Caitlyn as the highest autoattack range at level 1 with 650, surpassed by Tristana at level 17 with 653 autoattack range.
Champion ranges
Increasing Attack Range
The following game elements increase the champion's respective attack range, without affecting the champion's range type (melee or ranged).
Champion abilities
-
Aatrox's Deathbringer Stance
- Akali's Swinging Kama
- Azir's Arise!
- Caitlyn's Headshot with Yordle Snap Trap or 90 Caliber Net
- Camille's Precision Protocol
- Cho'Gath's Vorpal Spikes and Feast
- Darius' Crippling Strike
- Dr. Mundo's Masochism
- Ekko's Phase Dive
- Fiora's Bladework
- Fizz's Seastone Trident
- Gnar's Rage Gene
- Gragas' Drunken Rage
- Hecarim's Devastating Charge
- Illaoi's Harsh Lesson
- Jax's Empower
- Jinx's Fishbones
- Kassadin's Nether Blade
- Kha'Zix's Evolved Reaper Claws
- Kindred's Mark of the Kindred
- Kled's Skaarl (while dismounted)
- Kog'Maw's Bio-Arcane Barrage
- Leona's Shield of Daybreak and Solar Flare
- Mordekaiser's Dragon Ghost
- Nasus' Siphoning Strike and Fury of the Sands
- Nidalee's Takedown
- Poppy's Iron Ambassador
- Renekton's Ruthless Predator and Dominus
- Rengar's Unseen Predator
- Riven's Blade of the Exile
- Shen's Twilight Assault
- Shyvana's Dragon's Descent
- Tristana's Draw a Bead
- Twitch's Spray and Pray
- Udyr's Bear Stance
- Vi's Excessive Force
- Wukong's Crushing Blow
- Yorick's Last Rites
- Zac's Stretching Strikes
Items
Decreasing Attack Range
The following game elements decrease the champion's respective attack range, without affecting the champion's range type (melee or ranged).
Range Type Modifiers
The following abilities change a champion attack classification from 
melee to 
ranged, or vice versa.
- Elise's Spider Form
- Gnar's Mini Gnar / Mega Gnar
- Ivern's Brushmaker
- Jayce's Transform Mercury Cannon
- Kayle's Arisen and Starfire Spellblade
- Nidalee's Aspect of the Cougar
Range Type Differences
The following game elements have their effects modified based on the champion range type, melee or ranged. Champion with range type modifiers are not affected by item range-restrictions.
- Items
- Dead Man's Plate.
- Duskblade of Draktharr.
- Frozen Mallet.
- Guinsoo's Rageblade.
- Knight's Vow.
- Phage and its upgrades ( Trinity Force and The Black Cleaver).
- Ghostwalkers, Sterak's Gage, Tiamat, Ravenous Hydra and Titanic Hydra can only be purchased on melee champions.
- Runaan's Hurricane can only be purchased on ranged champions.
- Relic Shield and its upgrades ( Targon's Brace and Remnant of the Aspect).
- Timeworn Relic Shield and its upgrades ( Timeworn Targon's Brace and Timeworn Face of the Mountain).
- Wit's End.
-
- Runes
- Buffs
- Others
- Howling Abyss Aura: Melee champions passively gain 10 bonus magic resistance on the Howling Abyss.
-
Size Model Modifiers
Ranges calculated from the 
edge of a champion's hitbox will see an increase or decrease in reach based on the champion's current size. Note that a change in range due to the champion's size is only relative to the champion's center and is not an explicitly mentioned effect (i.e. the champion's attack range stat will not increase).
Champions
Innate
Thus far, 
Zac is the only champion with the innate quality of constantly modifying his size.
- His maximum size is increased by his maximum health.
- His current size fluctuates based on his current health percentage.
Size Increase
- Aatrox's World Ender
- Cho'Gath's Feast (also grants explicitly increased attack range)
- Lulu's Wild Growth
- Nasus' Fury of the Sands (also grants explicitly increased attack range)
- Renekton's Dominus (also grants explicitly increased attack range)
- Shyvana's Dragon's Descent (also grants explicitly increased attack range)
- Trundle's Subjugate (on himself)
- Volibear's Thunder Claws
Size Reduction
- Trundle's Subjugate (on target)
- Sona's Power Chord - Diminuendo (on target)
Items
While the following items do not explicitly increase the champion's attack range, they do increase the champion's size - allowing them to reach targets further away from their current location:
Targeted Abilities (Exceptions)
- The following targeted abilities calculate their range like a basic attack ( edge-to-edge)
- Abilities
- Summoner Spells
- Smite and its upgrades ( Challenging Smite and Chilling Smite)
-
References
- ↑ Hitboxes, Range and Deflection. "Hitboxes, Range, and Deflection" by Snickersnacks. Wayback Machine. Retrieved 13 April 2018
- ↑ Annie q and normal attack same 625 range, but normal attack range longer than q, Why?. Retrieved 13 August 2012
- ↑ What's the difference between spell range and autoattack range?. Retrieved 13 August 2012
